+1

.gitignore

··· 12 /binaries/releases/ 13 rustdoc-host.nix 14 **/**.car 0

··· 12 /binaries/releases/ 13 rustdoc-host.nix 14 **/**.car 15 + result

+129 -36

Cargo.lock

··· 2453 "tempfile", 2454 "thiserror 2.0.17", 2455 "tokio", 2456 - "toml", 2457 "walkdir", 2458 ] 2459 ··· 2624 2625 [[package]] 2626 name = "js-sys" 2627 - version = "0.3.81" 2628 source = "registry+https://github.com/rust-lang/crates.io-index" 2629 - checksum = "ec48937a97411dcb524a265206ccd4c90bb711fca92b2792c407f268825b9305" 2630 dependencies = [ 2631 "once_cell", 2632 "wasm-bindgen", ··· 2915 [[package]] 2916 name = "mini-moka" 2917 version = "0.11.0" 2918 - source = "git+https://github.com/moka-rs/mini-moka?rev=da864e849f5d034f32e02197fee9bb5d5af36d3d#da864e849f5d034f32e02197fee9bb5d5af36d3d" 2919 dependencies = [ 0 2920 "crossbeam-channel", 2921 "crossbeam-utils", 2922 "dashmap", 0 0 2923 "smallvec", 2924 "tagptr", 2925 "triomphe", 0 0 2926 "web-time", 0 0 0 0 0 0 0 0 0 0 2927 ] 2928 2929 [[package]] ··· 4390 ] 4391 4392 [[package]] 0 0 0 0 0 0 0 0 0 4393 name = "serde_urlencoded" 4394 version = "0.7.1" 4395 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 4741 "cfg-expr", 4742 "heck 0.5.0", 4743 "pkg-config", 4744 - "toml", 4745 "version-compare", 4746 ] 4747 ··· 4756 version = "0.12.16" 4757 source = "registry+https://github.com/rust-lang/crates.io-index" 4758 checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1" 0 0 0 0 0 0 4759 4760 [[package]] 4761 name = "tempfile" ··· 5057 checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362" 5058 dependencies = [ 5059 "serde", 5060 - "serde_spanned", 5061 - "toml_datetime", 5062 "toml_edit", 5063 ] 5064 5065 [[package]] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5066 name = "toml_datetime" 5067 version = "0.6.11" 5068 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5072 ] 5073 5074 [[package]] 0 0 0 0 0 0 0 0 0 5075 name = "toml_edit" 5076 version = "0.22.27" 5077 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5079 dependencies = [ 5080 "indexmap 2.12.0", 5081 "serde", 5082 - "serde_spanned", 5083 - "toml_datetime", 5084 "toml_write", 5085 "winnow 0.7.13", 5086 ] 5087 5088 [[package]] 0 0 0 0 0 0 0 0 0 5089 name = "toml_write" 5090 version = "0.1.2" 5091 source = "registry+https://github.com/rust-lang/crates.io-index" 5092 checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801" 5093 5094 [[package]] 0 0 0 0 0 0 5095 name = "tower" 5096 version = "0.5.2" 5097 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5223 version = "0.2.5" 5224 source = "registry+https://github.com/rust-lang/crates.io-index" 5225 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b" 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5226 5227 [[package]] 5228 name = "tungstenite" ··· 5476 5477 [[package]] 5478 name = "wasm-bindgen" 5479 - version = "0.2.104" 5480 source = "registry+https://github.com/rust-lang/crates.io-index" 5481 - checksum = "c1da10c01ae9f1ae40cbfac0bac3b1e724b320abfcf52229f80b547c0d250e2d" 5482 dependencies = [ 5483 "cfg-if", 5484 "once_cell", ··· 5488 ] 5489 5490 [[package]] 5491 - name = "wasm-bindgen-backend" 5492 - version = "0.2.104" 5493 - source = "registry+https://github.com/rust-lang/crates.io-index" 5494 - checksum = "671c9a5a66f49d8a47345ab942e2cb93c7d1d0339065d4f8139c486121b43b19" 5495 - dependencies = [ 5496 - "bumpalo", 5497 - "log", 5498 - "proc-macro2", 5499 - "quote", 5500 - "syn 2.0.108", 5501 - "wasm-bindgen-shared", 5502 - ] 5503 - 5504 - [[package]] 5505 name = "wasm-bindgen-futures" 5506 - version = "0.4.54" 5507 source = "registry+https://github.com/rust-lang/crates.io-index" 5508 - checksum = "7e038d41e478cc73bae0ff9b36c60cff1c98b8f38f8d7e8061e79ee63608ac5c" 5509 dependencies = [ 5510 "cfg-if", 5511 "js-sys", ··· 5516 5517 [[package]] 5518 name = "wasm-bindgen-macro" 5519 - version = "0.2.104" 5520 source = "registry+https://github.com/rust-lang/crates.io-index" 5521 - checksum = "7ca60477e4c59f5f2986c50191cd972e3a50d8a95603bc9434501cf156a9a119" 5522 dependencies = [ 5523 "quote", 5524 "wasm-bindgen-macro-support", ··· 5526 5527 [[package]] 5528 name = "wasm-bindgen-macro-support" 5529 - version = "0.2.104" 5530 source = "registry+https://github.com/rust-lang/crates.io-index" 5531 - checksum = "9f07d2f20d4da7b26400c9f4a0511e6e0345b040694e8a75bd41d578fa4421d7" 5532 dependencies = [ 0 5533 "proc-macro2", 5534 "quote", 5535 "syn 2.0.108", 5536 - "wasm-bindgen-backend", 5537 "wasm-bindgen-shared", 5538 ] 5539 5540 [[package]] 5541 name = "wasm-bindgen-shared" 5542 - version = "0.2.104" 5543 source = "registry+https://github.com/rust-lang/crates.io-index" 5544 - checksum = "bad67dc8b2a1a6e5448428adec4c3e84c43e561d8c9ee8a9e5aabeb193ec41d1" 5545 dependencies = [ 5546 "unicode-ident", 5547 ] 5548 5549 [[package]] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5550 name = "wasm-streams" 5551 version = "0.4.2" 5552 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5561 5562 [[package]] 5563 name = "web-sys" 5564 - version = "0.3.81" 5565 source = "registry+https://github.com/rust-lang/crates.io-index" 5566 - checksum = "9367c417a924a74cae129e6a2ae3b47fabb1f8995595ab474029da749a8be120" 5567 dependencies = [ 5568 "js-sys", 5569 "wasm-bindgen",

··· 2453 "tempfile", 2454 "thiserror 2.0.17", 2455 "tokio", 2456 + "toml 0.8.23", 2457 "walkdir", 2458 ] 2459 ··· 2624 2625 [[package]] 2626 name = "js-sys" 2627 + version = "0.3.82" 2628 source = "registry+https://github.com/rust-lang/crates.io-index" 2629 + checksum = "b011eec8cc36da2aab2d5cff675ec18454fad408585853910a202391cf9f8e65" 2630 dependencies = [ 2631 "once_cell", 2632 "wasm-bindgen", ··· 2915 [[package]] 2916 name = "mini-moka" 2917 version = "0.11.0" 0 2918 dependencies = [ 2919 + "anyhow", 2920 "crossbeam-channel", 2921 "crossbeam-utils", 2922 "dashmap", 2923 + "getrandom 0.2.16", 2924 + "once_cell", 2925 "smallvec", 2926 "tagptr", 2927 "triomphe", 2928 + "trybuild", 2929 + "wasm-bindgen-test", 2930 "web-time", 2931 + ] 2932 + 2933 + [[package]] 2934 + name = "minicov" 2935 + version = "0.3.7" 2936 + source = "registry+https://github.com/rust-lang/crates.io-index" 2937 + checksum = "f27fe9f1cc3c22e1687f9446c2083c4c5fc7f0bcf1c7a86bdbded14985895b4b" 2938 + dependencies = [ 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source = "registry+https://github.com/rust-lang/crates.io-index" 5122 + checksum = "f2cdb639ebbc97961c51720f858597f7f24c4fc295327923af55b74c3c724533" 5123 + dependencies = [ 5124 + "serde_core", 5125 + ] 5126 + 5127 + [[package]] 5128 name = "toml_edit" 5129 version = "0.22.27" 5130 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5132 dependencies = [ 5133 "indexmap 2.12.0", 5134 "serde", 5135 + "serde_spanned 0.6.9", 5136 + "toml_datetime 0.6.11", 5137 "toml_write", 5138 "winnow 0.7.13", 5139 ] 5140 5141 [[package]] 5142 + name = "toml_parser" 5143 + version = "1.0.4" 5144 + source = "registry+https://github.com/rust-lang/crates.io-index" 5145 + checksum = "c0cbe268d35bdb4bb5a56a2de88d0ad0eb70af5384a99d648cd4b3d04039800e" 5146 + dependencies = [ 5147 + "winnow 0.7.13", 5148 + ] 5149 + 5150 + [[package]] 5151 name = "toml_write" 5152 version = "0.1.2" 5153 source = "registry+https://github.com/rust-lang/crates.io-index" 5154 checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801" 5155 5156 [[package]] 5157 + name = "toml_writer" 5158 + version = "1.0.4" 5159 + source = "registry+https://github.com/rust-lang/crates.io-index" 5160 + checksum = "df8b2b54733674ad286d16267dcfc7a71ed5c776e4ac7aa3c3e2561f7c637bf2" 5161 + 5162 + [[package]] 5163 name = "tower" 5164 version = "0.5.2" 5165 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5291 version = "0.2.5" 5292 source = "registry+https://github.com/rust-lang/crates.io-index" 5293 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b" 5294 + 5295 + [[package]] 5296 + name = "trybuild" 5297 + version = "1.0.114" 5298 + source = "registry+https://github.com/rust-lang/crates.io-index" 5299 + checksum = "3e17e807bff86d2a06b52bca4276746584a78375055b6e45843925ce2802b335" 5300 + dependencies = [ 5301 + "glob", 5302 + "serde", 5303 + "serde_derive", 5304 + "serde_json", 5305 + "target-triple", 5306 + "termcolor", 5307 + "toml 0.9.8", 5308 + ] 5309 5310 [[package]] 5311 name = "tungstenite" ··· 5559 5560 [[package]] 5561 name = "wasm-bindgen" 5562 + version = "0.2.105" 5563 source = "registry+https://github.com/rust-lang/crates.io-index" 5564 + checksum = "da95793dfc411fbbd93f5be7715b0578ec61fe87cb1a42b12eb625caa5c5ea60" 5565 dependencies = [ 5566 "cfg-if", 5567 "once_cell", ··· 5571 ] 5572 5573 [[package]] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5574 name = "wasm-bindgen-futures" 5575 + version = "0.4.55" 5576 source = "registry+https://github.com/rust-lang/crates.io-index" 5577 + checksum = "551f88106c6d5e7ccc7cd9a16f312dd3b5d36ea8b4954304657d5dfba115d4a0" 5578 dependencies = [ 5579 "cfg-if", 5580 "js-sys", ··· 5585 5586 [[package]] 5587 name = "wasm-bindgen-macro" 5588 + version = "0.2.105" 5589 source = "registry+https://github.com/rust-lang/crates.io-index" 5590 + checksum = "04264334509e04a7bf8690f2384ef5265f05143a4bff3889ab7a3269adab59c2" 5591 dependencies = [ 5592 "quote", 5593 "wasm-bindgen-macro-support", ··· 5595 5596 [[package]] 5597 name = "wasm-bindgen-macro-support" 5598 + version = "0.2.105" 5599 source = "registry+https://github.com/rust-lang/crates.io-index" 5600 + checksum = "420bc339d9f322e562942d52e115d57e950d12d88983a14c79b86859ee6c7ebc" 5601 dependencies = [ 5602 + "bumpalo", 5603 "proc-macro2", 5604 "quote", 5605 "syn 2.0.108", 0 5606 "wasm-bindgen-shared", 5607 ] 5608 5609 [[package]] 5610 name = "wasm-bindgen-shared" 5611 + version = "0.2.105" 5612 source = "registry+https://github.com/rust-lang/crates.io-index" 5613 + checksum = "76f218a38c84bcb33c25ec7059b07847d465ce0e0a76b995e134a45adcb6af76" 5614 dependencies = [ 5615 "unicode-ident", 5616 ] 5617 5618 [[package]] 5619 + name = "wasm-bindgen-test" 5620 + version = "0.3.55" 5621 + source = "registry+https://github.com/rust-lang/crates.io-index" 5622 + checksum = "bfc379bfb624eb59050b509c13e77b4eb53150c350db69628141abce842f2373" 5623 + dependencies = [ 5624 + "js-sys", 5625 + "minicov", 5626 + "wasm-bindgen", 5627 + "wasm-bindgen-futures", 5628 + "wasm-bindgen-test-macro", 5629 + ] 5630 + 5631 + [[package]] 5632 + name = "wasm-bindgen-test-macro" 5633 + version = "0.3.55" 5634 + source = "registry+https://github.com/rust-lang/crates.io-index" 5635 + checksum = "085b2df989e1e6f9620c1311df6c996e83fe16f57792b272ce1e024ac16a90f1" 5636 + dependencies = [ 5637 + "proc-macro2", 5638 + "quote", 5639 + "syn 2.0.108", 5640 + ] 5641 + 5642 + [[package]] 5643 name = "wasm-streams" 5644 version = "0.4.2" 5645 source = "registry+https://github.com/rust-lang/crates.io-index" ··· 5654 5655 [[package]] 5656 name = "web-sys" 5657 + version = "0.3.82" 5658 source = "registry+https://github.com/rust-lang/crates.io-index" 5659 + checksum = "3a1f95c0d03a47f4ae1f7a64643a6bb97465d9b740f0fa8f90ea33915c99a9a1" 5660 dependencies = [ 5661 "js-sys", 5662 "wasm-bindgen",

+2 -2

crates/jacquard-identity/Cargo.toml

··· 37 urlencoding.workspace = true 38 tracing = { workspace = true, optional = true } 39 n0-future = { workspace = true, optional = true } 40 - mini-moka = { version = "0.11.0", git = "https://github.com/moka-rs/mini-moka", rev = "da864e849f5d034f32e02197fee9bb5d5af36d3d", optional = true } 41 # mini-moka = { version = "0.10", optional = true } 42 43 [target.'cfg(not(target_family = "wasm"))'.dependencies] ··· 46 47 48 [target.'cfg(target_arch = "wasm32")'.dependencies] 49 - mini-moka = { version = "0.11.0", git = "https://github.com/moka-rs/mini-moka", rev = "da864e849f5d034f32e02197fee9bb5d5af36d3d", features = ["js"], optional = true } 50 51 52 [[example]]

··· 37 urlencoding.workspace = true 38 tracing = { workspace = true, optional = true } 39 n0-future = { workspace = true, optional = true } 40 + mini-moka = { version = "0.11.0", path = "../mini-moka-vendored", optional = true } 41 # mini-moka = { version = "0.10", optional = true } 42 43 [target.'cfg(not(target_family = "wasm"))'.dependencies] ··· 46 47 48 [target.'cfg(target_arch = "wasm32")'.dependencies] 49 + mini-moka = { version = "0.11.0",path = "../mini-moka-vendored", features = ["js"], optional = true } 50 51 52 [[example]]

+18 -18

crates/jacquard-lexicon/src/codegen.rs

··· 513 assert!(formatted.contains("Account")); 514 } 515 516 - #[test] 517 - fn test_generate_token_type() { 518 - let corpus = 519 - LexiconCorpus::load_from_dir("tests/fixtures/test_lexicons").expect("load corpus"); 520 - let codegen = CodeGenerator::new(&corpus, "jacquard_api"); 521 522 - let doc = corpus.get("app.bsky.embed.images").expect("get images"); 523 - let def = doc.defs.get("viewImage").expect("get viewImage def"); 524 525 - let tokens = codegen 526 - .generate_def("app.bsky.embed.images", "viewImage", def) 527 - .expect("generate"); 528 529 - let file: syn::File = syn::parse2(tokens).expect("parse tokens"); 530 - let formatted = prettyplease::unparse(&file); 531 - println!("\n{}\n", formatted); 532 533 - // Token types are unit structs 534 - assert!(formatted.contains("struct ViewImage")); 535 - // Should have Display implementation 536 - assert!(formatted.contains("impl std::fmt::Display")); 537 - } 538 539 #[test] 540 fn test_generate_array_types() {

··· 513 assert!(formatted.contains("Account")); 514 } 515 516 + // #[test] 517 + // fn test_generate_token_type() { 518 + // let corpus = 519 + // LexiconCorpus::load_from_dir("tests/fixtures/test_lexicons").expect("load corpus"); 520 + // let codegen = CodeGenerator::new(&corpus, "jacquard_api"); 521 522 + // let doc = corpus.get("app.bsky.embed.images").expect("get images"); 523 + // let def = doc.defs.get("viewImage").expect("get viewImage def"); 524 525 + // let tokens = codegen 526 + // .generate_def("app.bsky.embed.images", "viewImage", def) 527 + // .expect("generate"); 528 529 + // let file: syn::File = syn::parse2(tokens).expect("parse tokens"); 530 + // let formatted = prettyplease::unparse(&file); 531 + // println!("\n{}\n", formatted); 532 533 + // // Token types are unit structs 534 + // assert!(formatted.contains("struct ViewImage")); 535 + // // Should have Display implementation 536 + // assert!(formatted.contains("impl std::fmt::Display")); 537 + // } 538 539 #[test] 540 fn test_generate_array_types() {

+37

crates/mini-moka-vendored/.github/workflows/Audit.yml

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + name: Cargo Audit 2 + 3 + on: 4 + push: 5 + paths: 6 + - '**/Cargo.toml' 7 + - '**/Cargo.lock' 8 + schedule: 9 + # https://crontab.guru/ 10 + - cron: '5 20 * * 5' 11 + 12 + jobs: 13 + audit: 14 + runs-on: ubuntu-latest 15 + steps: 16 + - name: Checkout Mini Moka 17 + uses: actions/checkout@v4 18 + 19 + - name: Install Rust toolchain (Nightly) 20 + uses: dtolnay/rust-toolchain@master 21 + with: 22 + toolchain: nightly 23 + 24 + - run: cargo clean 25 + 26 + - name: Check for known security vulnerabilities (Latest versions) 27 + uses: actions-rs/audit-check@v1 28 + with: 29 + token: ${{ secrets.GITHUB_TOKEN }} 30 + 31 + - name: Downgrade dependencies to minimal versions 32 + run: cargo update -Z minimal-versions 33 + 34 + - name: Check for known security vulnerabilities (Minimal versions) 35 + uses: actions-rs/audit-check@v1 36 + with: 37 + token: ${{ secrets.GITHUB_TOKEN }}

+52

crates/mini-moka-vendored/.github/workflows/CI.yml

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + name: CI 2 + 3 + on: 4 + push: 5 + paths-ignore: 6 + - '.devcontainer/**' 7 + - '.gitpod.yml' 8 + - '.vscode/**' 9 + pull_request: 10 + paths-ignore: 11 + - '.devcontainer/**' 12 + - '.gitpod.yml' 13 + - '.vscode/**' 14 + schedule: 15 + # Run against the last commit on the default branch on Friday at 8pm (UTC?) 16 + - cron: '0 20 * * 5' 17 + 18 + jobs: 19 + test: 20 + runs-on: ubuntu-latest 21 + strategy: 22 + fail-fast: false 23 + matrix: 24 + rust: 25 + - stable 26 + - beta 27 + - 1.76.0 # MSRV 28 + - nightly # For checking minimum version dependencies. 29 + 30 + steps: 31 + - name: Checkout Mini Moka 32 + uses: actions/checkout@v4 33 + 34 + - name: Install Rust toolchain 35 + uses: dtolnay/rust-toolchain@master 36 + with: 37 + toolchain: ${{ matrix.rust }} 38 + 39 + - run: cargo clean 40 + 41 + - name: Downgrade dependencies to minimal versions (Nightly only) 42 + if: ${{ matrix.rust == 'nightly' }} 43 + run: cargo update -Z minimal-versions 44 + 45 + - name: Show cargo tree 46 + run: cargo tree 47 + 48 + - name: Run tests (debug, sync feature) 49 + run: cargo test --features sync 50 + 51 + - name: Run tests (release, sync feature) 52 + run: cargo test --release --features sync

+31

crates/mini-moka-vendored/.github/workflows/Kani.yml

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + name: Kani CI 2 + 3 + on: 4 + pull_request: 5 + paths-ignore: 6 + - '.vscode/**' 7 + - CHANGELOG.md 8 + - README.md 9 + push: 10 + paths-ignore: 11 + - '.vscode/**' 12 + - CHANGELOG.md 13 + - README.md 14 + 15 + jobs: 16 + run-kani: 17 + runs-on: ubuntu-latest 18 + steps: 19 + - name: Checkout Moka 20 + uses: actions/checkout@v4 21 + 22 + - name: Show CPU into 23 + run: | 24 + nproc 25 + lscpu 26 + free -m 27 + - name: Run Kani 28 + uses: model-checking/kani-github-action@v1.0 29 + # Workaround for https://github.com/moka-rs/mini-moka/issues/36 30 + with: 31 + kani-version: '0.54.0'

+42

crates/mini-moka-vendored/.github/workflows/Lints.yml

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + name: Clippy lints and Rustfmt 2 + 3 + on: 4 + push: 5 + paths-ignore: 6 + - '.devcontainer/**' 7 + - '.gitpod.yml' 8 + - '.vscode/**' 9 + schedule: 10 + # Run against the last commit on the default branch on Friday at 7pm (UTC?) 11 + - cron: '0 19 * * 5' 12 + 13 + jobs: 14 + test: 15 + runs-on: ubuntu-latest 16 + strategy: 17 + matrix: 18 + rust: 19 + - toolchain: stable 20 + - toolchain: beta 21 + rustflags: '--cfg beta_clippy' 22 + 23 + steps: 24 + - name: Checkout Mini Moka 25 + uses: actions/checkout@v4 26 + 27 + - name: Install Rust toolchain 28 + uses: dtolnay/rust-toolchain@master 29 + with: 30 + toolchain: ${{ matrix.rust.toolchain }} 31 + components: rustfmt, clippy 32 + 33 + - run: cargo clean 34 + 35 + - name: Run Clippy 36 + run: cargo clippy --lib --tests --all-features --all-targets -- -D warnings 37 + env: 38 + RUSTFLAGS: ${{ matrix.rust.rustflags }} 39 + 40 + - name: Run Rustfmt 41 + if: ${{ matrix.rust.toolchain == 'stable' }} 42 + run: cargo fmt --all -- --check

+61

crates/mini-moka-vendored/.github/workflows/LinuxCrossCompileTest.yml

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + name: Linux cross compile tests 2 + 3 + on: 4 + push: 5 + paths-ignore: 6 + - ".devcontainer/**" 7 + - ".gitpod.yml" 8 + - ".vscode/**" 9 + - "tests/**" 10 + pull_request: 11 + paths-ignore: 12 + - ".devcontainer/**" 13 + - ".gitpod.yml" 14 + - ".vscode/**" 15 + - "tests/**" 16 + schedule: 17 + # Run against the last commit on the default branch on Friday at 9pm (UTC?) 18 + - cron: "0 21 * * 5" 19 + 20 + jobs: 21 + linux-cross: 22 + runs-on: ubuntu-latest 23 + strategy: 24 + fail-fast: false 25 + matrix: 26 + platform: 27 + - target: aarch64-unknown-linux-musl 28 + rust-version: stable 29 + - target: i686-unknown-linux-musl 30 + rust-version: stable 31 + - target: armv7-unknown-linux-musleabihf 32 + rust-version: stable 33 + - target: armv5te-unknown-linux-musleabi 34 + rust-version: stable 35 + 36 + steps: 37 + - name: Checkout Mini Moka 38 + uses: actions/checkout@v4 39 + 40 + - name: Install Rust toolchain 41 + uses: dtolnay/rust-toolchain@master 42 + with: 43 + toolchain: ${{ matrix.platform.rust-version }} 44 + targets: ${{ matrix.platform.target }} 45 + 46 + - name: Install cross 47 + uses: taiki-e/install-action@v2 48 + with: 49 + tool: cross 50 + 51 + - name: Remove integration tests and force enable rustc_version crate 52 + run: | 53 + rm -rf tests 54 + sed -i '/actix-rt\|async-std\|reqwest/d' Cargo.toml 55 + 56 + - run: cargo clean 57 + 58 + - name: Run tests (sync feature) 59 + run: | 60 + cross ${{ matrix.platform.carge-version }} test --release -F sync \ 61 + --target ${{ matrix.platform.target }}

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crates/mini-moka-vendored/.github/workflows/Miri.yml

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··· 1 + name: Miri tests 2 + 3 + on: 4 + push: 5 + paths-ignore: 6 + - '.devcontainer/**' 7 + - '.gitpod.yml' 8 + - '.vscode/**' 9 + - 'tests/**' 10 + pull_request: 11 + paths-ignore: 12 + - '.devcontainer/**' 13 + - '.gitpod.yml' 14 + - '.vscode/**' 15 + - 'tests/**' 16 + schedule: 17 + # Run against the last commit on the default branch on Friday at 9pm (UTC?) 18 + - cron: '0 21 * * 5' 19 + 20 + jobs: 21 + test: 22 + runs-on: ubuntu-latest 23 + 24 + steps: 25 + - name: Checkout Mini Moka 26 + uses: actions/checkout@v4 27 + 28 + - name: Install Rust nightly toolchain with Miri 29 + uses: dtolnay/rust-toolchain@master 30 + with: 31 + toolchain: nightly 32 + components: miri 33 + 34 + - run: cargo clean 35 + 36 + - name: Run Miri test (deque) 37 + run: cargo miri test deque

+35

crates/mini-moka-vendored/.github/workflows/Trybuild.yml

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··· 1 + name: Trybuild 2 + 3 + on: 4 + push: 5 + paths-ignore: 6 + - '.devcontainer/**' 7 + - '.gitpod.yml' 8 + - '.vscode/**' 9 + schedule: 10 + # Run against the last commit on the default branch on Friday at 9pm (UTC?) 11 + - cron: '0 21 * * 5' 12 + 13 + jobs: 14 + test: 15 + runs-on: ubuntu-latest 16 + strategy: 17 + matrix: 18 + rust: 19 + - stable 20 + - beta 21 + 22 + steps: 23 + - name: Checkout Mini Moka 24 + uses: actions/checkout@v4 25 + 26 + - name: Install Rust toolchain 27 + uses: dtolnay/rust-toolchain@master 28 + with: 29 + toolchain: ${{ matrix.rust }} 30 + 31 + - name: Run compile error tests (sync feature, trybuild) 32 + if: ${{ matrix.rust == 'stable' }} 33 + run: cargo test ui_trybuild --release --features sync 34 + env: 35 + RUSTFLAGS: '--cfg trybuild'

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crates/mini-moka-vendored/.gitignore

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··· 1 + **/*.rs.bk 2 + **/*~ 3 + .DS_Store 4 + /target/ 5 + Cargo.lock 6 + 7 + # intellij cache 8 + .idea

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crates/mini-moka-vendored/.vscode/settings.json

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··· 1 + { 2 + "rust-analyzer.cargo.features": [], 3 + "rust-analyzer.server.extraEnv": { 4 + "CARGO_TARGET_DIR": "target/ra" 5 + }, 6 + "editor.rulers": [85], 7 + "cSpell.words": [ 8 + "aarch", 9 + "actix", 10 + "ahash", 11 + "armv", 12 + "benmanes", 13 + "circleci", 14 + "CLFU", 15 + "clippy", 16 + "compat", 17 + "cpus", 18 + "dashmap", 19 + "deqs", 20 + "Deque", 21 + "Deques", 22 + "devcontainer", 23 + "docsrs", 24 + "doctest", 25 + "doctests", 26 + "Einziger", 27 + "else's", 28 + "Eytan", 29 + "getrandom", 30 + "hashbrown", 31 + "Hasher", 32 + "Kawano", 33 + "mapref", 34 + "Moka", 35 + "mpsc", 36 + "MSRV", 37 + "nanos", 38 + "nocapture", 39 + "Ohad", 40 + "peekable", 41 + "preds", 42 + "repr", 43 + "reqwest", 44 + "runtimes", 45 + "rustc", 46 + "rustdoc", 47 + "RUSTFLAGS", 48 + "rustfmt", 49 + "semver", 50 + "SIGABRT", 51 + "SIGILL", 52 + "smallvec", 53 + "structs", 54 + "tagptr", 55 + "Tatsuya", 56 + "thiserror", 57 + "toolchain", 58 + "triomphe", 59 + "trybuild", 60 + "Uninit", 61 + "unsync", 62 + "Upsert", 63 + "usize" 64 + ], 65 + "files.watcherExclude": { 66 + "**/target": true 67 + }, 68 + "cSpell.enableFiletypes": [ 69 + "toml" 70 + ] 71 + }

+70

crates/mini-moka-vendored/CHANGELOG.md

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··· 1 + # Mini Moka Cache &mdash; Change Log 2 + 3 + ## Version 0.10.3 4 + 5 + ### Fixed 6 + 7 + - Fixed occasional panic in internal `FrequencySketch` in debug build. 8 + ([#21][gh-issue-0021]) 9 + 10 + 11 + ## Version 0.10.2 12 + 13 + ### Fixed 14 + 15 + - Fixed a memory corruption bug caused by the timing of concurrent `insert`, 16 + `get` and removal of the same cached entry. ([#15][gh-pull-0015]). 17 + 18 + 19 + ## Version 0.10.1 20 + 21 + Bumped the minimum supported Rust version (MSRV) to 1.61 (May 19, 2022). 22 + ([#5][gh-pull-0005]) 23 + 24 + ### Fixed 25 + 26 + - Fixed the caches mutating a deque node through a `NonNull` pointer derived from a 27 + shared reference. ([#6][gh-pull-0006]). 28 + 29 + 30 + ## Version 0.10.0 31 + 32 + In this version, we removed some dependencies from Mini Moka to make it more 33 + lightweight. 34 + 35 + ### Removed 36 + 37 + - Remove the background threads from the `sync::Cache` ([#1][gh-pull-0001]): 38 + - Also remove the following dependencies: 39 + - `scheduled-thread-pool` 40 + - `num_cpus` 41 + - `once_cell` (Moved to the dev-dependencies) 42 + - Remove the following dependencies and crate features ([#2][gh-pull-0002]): 43 + - Removed dependencies: 44 + - `quanta` 45 + - `parking_lot` 46 + - `rustc_version` (from the build-dependencies) 47 + - Removed crate features: 48 + - `quanta` (was enabled by default) 49 + - `atomic64` (was enabled by default) 50 + 51 + ## Version 0.9.6 52 + 53 + ### Added 54 + 55 + - Move the relevant source code from the GitHub moka-rs/moka repository (at 56 + [v0.9.6][moka-v0.9.6] tag) to this moka-rs/mini-moka repository. 57 + - Rename `moka::dash` module to `mini_moka::sync`. 58 + - Rename `moka::unsync` module to `mini_moka::unsync`. 59 + - Rename a crate feature `dash` to `sync` and make it a default. 60 + 61 + <!-- Links --> 62 + [moka-v0.9.6]: https://github.com/moka-rs/moka/tree/v0.9.6 63 + 64 + [gh-issue-0021]: https://github.com/moka-rs/mini-moka/issues/21/ 65 + 66 + [gh-pull-0015]: https://github.com/moka-rs/mini-moka/pull/15/ 67 + [gh-pull-0006]: https://github.com/moka-rs/mini-moka/pull/6/ 68 + [gh-pull-0005]: https://github.com/moka-rs/mini-moka/pull/5/ 69 + [gh-pull-0002]: https://github.com/moka-rs/mini-moka/pull/2/ 70 + [gh-pull-0001]: https://github.com/moka-rs/mini-moka/pull/1/

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crates/mini-moka-vendored/Cargo.toml

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··· 1 + [package] 2 + name = "mini-moka" 3 + version = "0.11.0" 4 + edition = "2018" 5 + rust-version = "1.76" 6 + 7 + description = "A lighter edition of Moka, a fast and concurrent cache library" 8 + license = "MIT OR Apache-2.0" 9 + # homepage = "https://" 10 + documentation = "https://docs.rs/mini-moka/" 11 + repository = "https://github.com/moka-rs/mini-moka" 12 + keywords = ["cache", "concurrent"] 13 + categories = ["caching", "concurrency"] 14 + readme = "README.md" 15 + exclude = [".circleci", ".devcontainer", ".github", ".gitpod.yml", ".vscode"] 16 + 17 + [features] 18 + default = ["sync"] 19 + js = ["dep:web-time"] 20 + 21 + sync = ["dashmap"] 22 + 23 + [dependencies] 24 + crossbeam-channel = "0.5.5" 25 + crossbeam-utils = "0.8" 26 + smallvec = "1.8" 27 + tagptr = "0.2" 28 + web-time = { version = "1.1.0", optional = true } 29 + 30 + # Opt-out serde and stable_deref_trait features 31 + # https://github.com/Manishearth/triomphe/pull/5 32 + triomphe = { version = "0.1.13", default-features = false } 33 + 34 + # Optional dependencies (enabled by default) 35 + dashmap = { version = "6.1", optional = true } 36 + 37 + [dev-dependencies] 38 + anyhow = "1.0.19" 39 + getrandom = "0.2" 40 + once_cell = "1.7" 41 + wasm-bindgen-test = "0.3.50" 42 + 43 + [target.wasm32-unknown-unknown.dev-dependencies] 44 + getrandom = { version="0.2", features = ["js"] } 45 + 46 + [target.'cfg(trybuild)'.dev-dependencies] 47 + trybuild = "1.0" 48 + 49 + # https://docs.rs/about/metadata 50 + [package.metadata.docs.rs] 51 + # Build the doc with some features enabled. 52 + features = [] 53 + rustdoc-args = ["--cfg", "docsrs"] 54 + 55 + [lints.rust] 56 + unexpected_cfgs = { level = "warn", check-cfg = [ 57 + "cfg(kani)", 58 + "cfg(skeptic)", 59 + "cfg(circleci)", 60 + "cfg(trybuild)", 61 + "cfg(beta_clippy)", 62 + ] }

+201

crates/mini-moka-vendored/LICENSE-APACHE

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crates/mini-moka-vendored/LICENSE-MIT

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··· 1 + MIT License 2 + 3 + Copyright (c) 2020 - 2024 Tatsuya Kawano 4 + 5 + Permission is hereby granted, free of charge, to any person obtaining a copy 6 + of this software and associated documentation files (the "Software"), to deal 7 + in the Software without restriction, including without limitation the rights 8 + to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 + copies of the Software, and to permit persons to whom the Software is 10 + furnished to do so, subject to the following conditions: 11 + 12 + The above copyright notice and this permission notice shall be included in all 13 + copies or substantial portions of the Software. 14 + 15 + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 + IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 + AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 + LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 + OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 + SOFTWARE.

+321

crates/mini-moka-vendored/README.md

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··· 1 + # Vendored in until upstream PR for wasm compat is merged or I reimplement. 2 + 3 + # Mini Moka 4 + 5 + [![GitHub Actions][gh-actions-badge]][gh-actions] 6 + [![crates.io release][release-badge]][crate] 7 + [![docs][docs-badge]][docs] 8 + [![dependency status][deps-rs-badge]][deps-rs] 9 + <!-- [![coverage status][coveralls-badge]][coveralls] --> 10 + [![license][license-badge]](#license) 11 + <!-- [](https://app.fossa.com/projects/git%2Bgithub.com%2Fmoka-rs%2Fmini-moka?ref=badge_shield) --> 12 + 13 + Mini Moka is a fast, concurrent cache library for Rust. Mini Moka is a light edition 14 + of [Moka][moka-git]. 15 + 16 + Mini Moka provides cache implementations on top of hash maps. They support full 17 + concurrency of retrievals and a high expected concurrency for updates. Mini Moka also 18 + provides a non-thread-safe cache implementation for single thread applications. 19 + 20 + All caches perform a best-effort bounding of a hash map using an entry replacement 21 + algorithm to determine which entries to evict when the capacity is exceeded. 22 + 23 + [gh-actions-badge]: https://github.com/moka-rs/mini-moka/workflows/CI/badge.svg 24 + [release-badge]: https://img.shields.io/crates/v/mini-moka.svg 25 + [docs-badge]: https://docs.rs/mini-moka/badge.svg 26 + [deps-rs-badge]: https://deps.rs/repo/github/moka-rs/mini-moka/status.svg 27 + <!-- [coveralls-badge]: https://coveralls.io/repos/github/mini-moka-rs/moka/badge.svg?branch=main --> 28 + [license-badge]: https://img.shields.io/crates/l/mini-moka.svg 29 + <!-- [fossa-badge]: https://app.fossa.com/api/projects/git%2Bgithub.com%2Fmoka-rs%2Fmini-moka.svg?type=shield --> 30 + 31 + [gh-actions]: https://github.com/moka-rs/mini-moka/actions?query=workflow%3ACI 32 + [crate]: https://crates.io/crates/mini-moka 33 + [docs]: https://docs.rs/mini-moka 34 + [deps-rs]: https://deps.rs/repo/github/moka-rs/mini-moka 35 + <!-- [coveralls]: https://coveralls.io/github/moka-rs/mini-moka?branch=main --> 36 + <!-- [fossa]: https://app.fossa.com/projects/git%2Bgithub.com%2Fmoka-rs%2Fmini-moka?ref=badge_shield --> 37 + 38 + [moka-git]: https://github.com/moka-rs/moka 39 + [caffeine-git]: https://github.com/ben-manes/caffeine 40 + 41 + 42 + ## Features 43 + 44 + - Thread-safe, highly concurrent in-memory cache implementation. 45 + - A cache can be bounded by one of the followings: 46 + - The maximum number of entries. 47 + - The total weighted size of entries. (Size aware eviction) 48 + - Maintains near optimal hit ratio by using an entry replacement algorithms inspired 49 + by Caffeine: 50 + - Admission to a cache is controlled by the Least Frequently Used (LFU) policy. 51 + - Eviction from a cache is controlled by the Least Recently Used (LRU) policy. 52 + - [More details and some benchmark results are available here][tiny-lfu]. 53 + - Supports expiration policies: 54 + - Time to live 55 + - Time to idle 56 + 57 + <!-- 58 + Mini Moka provides a rich and flexible feature set while maintaining high hit ratio 59 + and a high level of concurrency for concurrent access. However, it may not be as fast 60 + as other caches, especially those that focus on much smaller feature sets. 61 + 62 + If you do not need features like: time to live, and size aware eviction, you may want 63 + to take a look at the [Quick Cache][quick-cache] crate. 64 + --> 65 + 66 + [tiny-lfu]: https://github.com/moka-rs/moka/wiki#admission-and-eviction-policies 67 + <!-- [quick-cache]: https://crates.io/crates/quick_cache --> 68 + 69 + 70 + ## Change Log 71 + 72 + - [CHANGELOG.md](https://github.com/moka-rs/mini-moka/blob/main/CHANGELOG.md) 73 + 74 + 75 + ## Table of Contents 76 + 77 + - [Features](#features) 78 + - [Change Log](#change-log) 79 + - [Usage](#usage) 80 + - [Example: Synchronous Cache](#example-synchronous-cache) 81 + - [Avoiding to clone the value at `get`](#avoiding-to-clone-the-value-at-get) 82 + - Examples (Part 2) 83 + - [Size Aware Eviction](#example-size-aware-eviction) 84 + - [Expiration Policies](#example-expiration-policies) 85 + - [Minimum Supported Rust Versions](#minimum-supported-rust-versions) 86 + - [Developing Mini Moka](#developing-mini-moka) 87 + - [Credits](#credits) 88 + - [License](#license) 89 + 90 + 91 + ## Usage 92 + 93 + Add this to your `Cargo.toml`: 94 + 95 + ```toml 96 + [dependencies] 97 + mini_moka = "0.10" 98 + ``` 99 + 100 + 101 + ## Example: Synchronous Cache 102 + 103 + The thread-safe, synchronous caches are defined in the `sync` module. 104 + 105 + Cache entries are manually added using `insert` method, and are stored in the cache 106 + until either evicted or manually invalidated. 107 + 108 + Here's an example of reading and updating a cache by using multiple threads: 109 + 110 + ```rust 111 + // Use the synchronous cache. 112 + use mini_moka::sync::Cache; 113 + 114 + use std::thread; 115 + 116 + fn value(n: usize) -> String { 117 + format!("value {}", n) 118 + } 119 + 120 + fn main() { 121 + const NUM_THREADS: usize = 16; 122 + const NUM_KEYS_PER_THREAD: usize = 64; 123 + 124 + // Create a cache that can store up to 10,000 entries. 125 + let cache = Cache::new(10_000); 126 + 127 + // Spawn threads and read and update the cache simultaneously. 128 + let threads: Vec<_> = (0..NUM_THREADS) 129 + .map(|i| { 130 + // To share the same cache across the threads, clone it. 131 + // This is a cheap operation. 132 + let my_cache = cache.clone(); 133 + let start = i * NUM_KEYS_PER_THREAD; 134 + let end = (i + 1) * NUM_KEYS_PER_THREAD; 135 + 136 + thread::spawn(move || { 137 + // Insert 64 entries. (NUM_KEYS_PER_THREAD = 64) 138 + for key in start..end { 139 + my_cache.insert(key, value(key)); 140 + // get() returns Option<String>, a clone of the stored value. 141 + assert_eq!(my_cache.get(&key), Some(value(key))); 142 + } 143 + 144 + // Invalidate every 4 element of the inserted entries. 145 + for key in (start..end).step_by(4) { 146 + my_cache.invalidate(&key); 147 + } 148 + }) 149 + }) 150 + .collect(); 151 + 152 + // Wait for all threads to complete. 153 + threads.into_iter().for_each(|t| t.join().expect("Failed")); 154 + 155 + // Verify the result. 156 + for key in 0..(NUM_THREADS * NUM_KEYS_PER_THREAD) { 157 + if key % 4 == 0 { 158 + assert_eq!(cache.get(&key), None); 159 + } else { 160 + assert_eq!(cache.get(&key), Some(value(key))); 161 + } 162 + } 163 + } 164 + ``` 165 + 166 + 167 + ## Avoiding to clone the value at `get` 168 + 169 + For the concurrent cache (`sync` cache), the return type of `get` method is 170 + `Option<V>` instead of `Option<&V>`, where `V` is the value type. Every time `get` is 171 + called for an existing key, it creates a clone of the stored value `V` and returns 172 + it. This is because the `Cache` allows concurrent updates from threads so a value 173 + stored in the cache can be dropped or replaced at any time by any other thread. `get` 174 + cannot return a reference `&V` as it is impossible to guarantee the value outlives 175 + the reference. 176 + 177 + If you want to store values that will be expensive to clone, wrap them by 178 + `std::sync::Arc` before storing in a cache. [`Arc`][rustdoc-std-arc] is a thread-safe 179 + reference-counted pointer and its `clone()` method is cheap. 180 + 181 + [rustdoc-std-arc]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html 182 + 183 + ```rust,ignore 184 + use std::sync::Arc; 185 + 186 + let key = ... 187 + let large_value = vec![0u8; 2 * 1024 * 1024]; // 2 MiB 188 + 189 + // When insert, wrap the large_value by Arc. 190 + cache.insert(key.clone(), Arc::new(large_value)); 191 + 192 + // get() will call Arc::clone() on the stored value, which is cheap. 193 + cache.get(&key); 194 + ``` 195 + 196 + 197 + ## Example: Size Aware Eviction 198 + 199 + If different cache entries have different "weights" &mdash; e.g. each entry has 200 + different memory footprints &mdash; you can specify a `weigher` closure at the cache 201 + creation time. The closure should return a weighted size (relative size) of an entry 202 + in `u32`, and the cache will evict entries when the total weighted size exceeds its 203 + `max_capacity`. 204 + 205 + ```rust 206 + use std::convert::TryInto; 207 + use mini_moka::sync::Cache; 208 + 209 + fn main() { 210 + let cache = Cache::builder() 211 + // A weigher closure takes &K and &V and returns a u32 representing the 212 + // relative size of the entry. Here, we use the byte length of the value 213 + // String as the size. 214 + .weigher(|_key, value: &String| -> u32 { 215 + value.len().try_into().unwrap_or(u32::MAX) 216 + }) 217 + // This cache will hold up to 32MiB of values. 218 + .max_capacity(32 * 1024 * 1024) 219 + .build(); 220 + cache.insert(0, "zero".to_string()); 221 + } 222 + ``` 223 + 224 + Note that weighted sizes are not used when making eviction selections. 225 + 226 + 227 + ## Example: Expiration Policies 228 + 229 + Mini Moka supports the following expiration policies: 230 + 231 + - **Time to live**: A cached entry will be expired after the specified duration past 232 + from `insert`. 233 + - **Time to idle**: A cached entry will be expired after the specified duration past 234 + from `get` or `insert`. 235 + 236 + To set them, use the `CacheBuilder`. 237 + 238 + ```rust 239 + use mini_moka::sync::Cache; 240 + use std::time::Duration; 241 + 242 + fn main() { 243 + let cache = Cache::builder() 244 + // Time to live (TTL): 30 minutes 245 + .time_to_live(Duration::from_secs(30 * 60)) 246 + // Time to idle (TTI): 5 minutes 247 + .time_to_idle(Duration::from_secs( 5 * 60)) 248 + // Create the cache. 249 + .build(); 250 + 251 + // This entry will expire after 5 minutes (TTI) if there is no get(). 252 + cache.insert(0, "zero"); 253 + 254 + // This get() will extend the entry life for another 5 minutes. 255 + cache.get(&0); 256 + 257 + // Even though we keep calling get(), the entry will expire 258 + // after 30 minutes (TTL) from the insert(). 259 + } 260 + ``` 261 + 262 + ### A note on expiration policies 263 + 264 + The cache builders will panic if configured with either `time_to_live` or `time to 265 + idle` longer than 1000 years. This is done to protect against overflow when computing 266 + key expiration. 267 + 268 + 269 + ## Minimum Supported Rust Versions 270 + 271 + Mini Moka's minimum supported Rust versions (MSRV) are the followings: 272 + 273 + | Feature | MSRV | 274 + |:-----------------|:--------------------------:| 275 + | default features | Rust 1.76.0 (Feb 8, 2024) | 276 + 277 + It will keep a rolling MSRV policy of at least 6 months. If only the default features 278 + are enabled, MSRV will be updated conservatively. When using other features, MSRV 279 + might be updated more frequently, up to the latest stable. In both cases, increasing 280 + MSRV is _not_ considered a semver-breaking change. 281 + 282 + 283 + ## Developing Mini Moka 284 + 285 + **Running All Tests** 286 + 287 + To run all tests including doc tests on the README, use the following command: 288 + 289 + ```console 290 + $ RUSTFLAGS='--cfg trybuild' cargo test --all-features 291 + ``` 292 + 293 + 294 + **Generating the Doc** 295 + 296 + ```console 297 + $ cargo +nightly -Z unstable-options --config 'build.rustdocflags="--cfg docsrs"' \ 298 + doc --no-deps 299 + ``` 300 + 301 + 302 + ## Credits 303 + 304 + ### Caffeine 305 + 306 + Mini Moka's architecture is heavily inspired by the [Caffeine][caffeine-git] library 307 + for Java. Thanks go to Ben Manes and all contributors of Caffeine. 308 + 309 + 310 + ## License 311 + 312 + Mini Moka is distributed under either of 313 + 314 + - The MIT license 315 + - The Apache License (Version 2.0) 316 + 317 + at your option. 318 + 319 + See [LICENSE-MIT](LICENSE-MIT) and [LICENSE-APACHE](LICENSE-APACHE) for details. 320 + 321 + <!-- [](https://app.fossa.com/projects/git%2Bgithub.com%2Fmoka-rs%2Fmini-moka?ref=badge_large) -->

+49

crates/mini-moka-vendored/src/common.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use std::convert::TryInto; 2 + 3 + #[cfg(feature = "sync")] 4 + pub(crate) mod concurrent; 5 + 6 + pub(crate) mod builder_utils; 7 + pub(crate) mod deque; 8 + pub(crate) mod frequency_sketch; 9 + pub(crate) mod time; 10 + 11 + // Note: `CacheRegion` cannot have more than four enum variants. This is because 12 + // `crate::{sync,unsync}::DeqNodes` uses a `tagptr::TagNonNull<DeqNode<T>, 2>` 13 + // pointer, where the 2-bit tag is `CacheRegion`. 14 + #[derive(Clone, Copy, Debug, Eq)] 15 + pub(crate) enum CacheRegion { 16 + Window = 0, 17 + MainProbation = 1, 18 + MainProtected = 2, 19 + Other = 3, 20 + } 21 + 22 + impl From<usize> for CacheRegion { 23 + fn from(n: usize) -> Self { 24 + match n { 25 + 0 => Self::Window, 26 + 1 => Self::MainProbation, 27 + 2 => Self::MainProtected, 28 + 3 => Self::Other, 29 + _ => panic!("No such CacheRegion variant for {}", n), 30 + } 31 + } 32 + } 33 + 34 + impl PartialEq<Self> for CacheRegion { 35 + fn eq(&self, other: &Self) -> bool { 36 + core::mem::discriminant(self) == core::mem::discriminant(other) 37 + } 38 + } 39 + 40 + impl PartialEq<usize> for CacheRegion { 41 + fn eq(&self, other: &usize) -> bool { 42 + *self as usize == *other 43 + } 44 + } 45 + 46 + // Ensures the value fits in a range of `128u32..=u32::MAX`. 47 + pub(crate) fn sketch_capacity(max_capacity: u64) -> u32 { 48 + max_capacity.try_into().unwrap_or(u32::MAX).max(128) 49 + }

+16

crates/mini-moka-vendored/src/common/builder_utils.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use std::time::Duration; 2 + 3 + const YEAR_SECONDS: u64 = 365 * 24 * 3600; 4 + 5 + pub(crate) fn ensure_expirations_or_panic( 6 + time_to_live: Option<Duration>, 7 + time_to_idle: Option<Duration>, 8 + ) { 9 + let max_duration = Duration::from_secs(1_000 * YEAR_SECONDS); 10 + if let Some(d) = time_to_live { 11 + assert!(d <= max_duration, "time_to_live is longer than 1000 years"); 12 + } 13 + if let Some(d) = time_to_idle { 14 + assert!(d <= max_duration, "time_to_idle is longer than 1000 years"); 15 + } 16 + }

+255

crates/mini-moka-vendored/src/common/concurrent.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use crate::common::{deque::DeqNode, time::Instant}; 2 + 3 + use std::{ptr::NonNull, sync::Arc}; 4 + use tagptr::TagNonNull; 5 + use triomphe::Arc as TrioArc; 6 + 7 + pub(crate) mod constants; 8 + pub(crate) mod deques; 9 + pub(crate) mod entry_info; 10 + pub(crate) mod housekeeper; 11 + 12 + pub(crate) mod atomic_time; 13 + 14 + use self::entry_info::EntryInfo; 15 + 16 + pub(crate) type Weigher<K, V> = Arc<dyn Fn(&K, &V) -> u32 + Send + Sync + 'static>; 17 + 18 + pub(crate) trait AccessTime { 19 + fn last_accessed(&self) -> Option<Instant>; 20 + fn set_last_accessed(&self, timestamp: Instant); 21 + fn last_modified(&self) -> Option<Instant>; 22 + fn set_last_modified(&self, timestamp: Instant); 23 + } 24 + 25 + pub(crate) struct KeyHash<K> { 26 + pub(crate) key: Arc<K>, 27 + pub(crate) hash: u64, 28 + } 29 + 30 + impl<K> KeyHash<K> { 31 + pub(crate) fn new(key: Arc<K>, hash: u64) -> Self { 32 + Self { key, hash } 33 + } 34 + } 35 + 36 + impl<K> Clone for KeyHash<K> { 37 + fn clone(&self) -> Self { 38 + Self { 39 + key: Arc::clone(&self.key), 40 + hash: self.hash, 41 + } 42 + } 43 + } 44 + 45 + pub(crate) struct KeyDate<K> { 46 + key: Arc<K>, 47 + entry_info: TrioArc<EntryInfo<K>>, 48 + } 49 + 50 + impl<K> KeyDate<K> { 51 + pub(crate) fn new(key: Arc<K>, entry_info: &TrioArc<EntryInfo<K>>) -> Self { 52 + Self { 53 + key, 54 + entry_info: TrioArc::clone(entry_info), 55 + } 56 + } 57 + 58 + pub(crate) fn key(&self) -> &Arc<K> { 59 + &self.key 60 + } 61 + } 62 + 63 + pub(crate) struct KeyHashDate<K> { 64 + key: Arc<K>, 65 + hash: u64, 66 + entry_info: TrioArc<EntryInfo<K>>, 67 + } 68 + 69 + impl<K> KeyHashDate<K> { 70 + pub(crate) fn new(kh: KeyHash<K>, entry_info: &TrioArc<EntryInfo<K>>) -> Self { 71 + Self { 72 + key: kh.key, 73 + hash: kh.hash, 74 + entry_info: TrioArc::clone(entry_info), 75 + } 76 + } 77 + 78 + pub(crate) fn key(&self) -> &Arc<K> { 79 + &self.key 80 + } 81 + 82 + pub(crate) fn hash(&self) -> u64 { 83 + self.hash 84 + } 85 + 86 + pub(crate) fn entry_info(&self) -> &EntryInfo<K> { 87 + &self.entry_info 88 + } 89 + } 90 + 91 + pub(crate) struct KvEntry<K, V> { 92 + pub(crate) key: Arc<K>, 93 + pub(crate) entry: TrioArc<ValueEntry<K, V>>, 94 + } 95 + 96 + impl<K, V> KvEntry<K, V> { 97 + pub(crate) fn new(key: Arc<K>, entry: TrioArc<ValueEntry<K, V>>) -> Self { 98 + Self { key, entry } 99 + } 100 + } 101 + 102 + impl<K> AccessTime for DeqNode<KeyDate<K>> { 103 + #[inline] 104 + fn last_accessed(&self) -> Option<Instant> { 105 + None 106 + } 107 + 108 + #[inline] 109 + fn set_last_accessed(&self, _timestamp: Instant) { 110 + unreachable!(); 111 + } 112 + 113 + #[inline] 114 + fn last_modified(&self) -> Option<Instant> { 115 + self.element.entry_info.last_modified() 116 + } 117 + 118 + #[inline] 119 + fn set_last_modified(&self, timestamp: Instant) { 120 + self.element.entry_info.set_last_modified(timestamp); 121 + } 122 + } 123 + 124 + impl<K> AccessTime for DeqNode<KeyHashDate<K>> { 125 + #[inline] 126 + fn last_accessed(&self) -> Option<Instant> { 127 + self.element.entry_info.last_accessed() 128 + } 129 + 130 + #[inline] 131 + fn set_last_accessed(&self, timestamp: Instant) { 132 + self.element.entry_info.set_last_accessed(timestamp); 133 + } 134 + 135 + #[inline] 136 + fn last_modified(&self) -> Option<Instant> { 137 + None 138 + } 139 + 140 + #[inline] 141 + fn set_last_modified(&self, _timestamp: Instant) { 142 + unreachable!(); 143 + } 144 + } 145 + 146 + // DeqNode for an access order queue. 147 + pub(crate) type KeyDeqNodeAo<K> = TagNonNull<DeqNode<KeyHashDate<K>>, 2>; 148 + 149 + // DeqNode for the write order queue. 150 + pub(crate) type KeyDeqNodeWo<K> = NonNull<DeqNode<KeyDate<K>>>; 151 + 152 + pub(crate) struct ValueEntry<K, V> { 153 + pub(crate) value: V, 154 + info: TrioArc<EntryInfo<K>>, 155 + } 156 + 157 + impl<K, V> ValueEntry<K, V> { 158 + pub(crate) fn new(value: V, entry_info: TrioArc<EntryInfo<K>>) -> Self { 159 + Self { 160 + value, 161 + info: entry_info, 162 + } 163 + } 164 + 165 + pub(crate) fn entry_info(&self) -> &TrioArc<EntryInfo<K>> { 166 + &self.info 167 + } 168 + 169 + pub(crate) fn is_admitted(&self) -> bool { 170 + self.info.is_admitted() 171 + } 172 + 173 + pub(crate) fn set_admitted(&self, value: bool) { 174 + self.info.set_admitted(value); 175 + } 176 + 177 + pub(crate) fn is_dirty(&self) -> bool { 178 + self.info.is_dirty() 179 + } 180 + 181 + pub(crate) fn set_dirty(&self, value: bool) { 182 + self.info.set_dirty(value); 183 + } 184 + 185 + #[inline] 186 + pub(crate) fn policy_weight(&self) -> u32 { 187 + self.info.policy_weight() 188 + } 189 + 190 + pub(crate) fn access_order_q_node(&self) -> Option<KeyDeqNodeAo<K>> { 191 + self.info.access_order_q_node() 192 + } 193 + 194 + pub(crate) fn set_access_order_q_node(&self, node: Option<KeyDeqNodeAo<K>>) { 195 + self.info.set_access_order_q_node(node); 196 + } 197 + 198 + pub(crate) fn take_access_order_q_node(&self) -> Option<KeyDeqNodeAo<K>> { 199 + self.info.take_access_order_q_node() 200 + } 201 + 202 + pub(crate) fn write_order_q_node(&self) -> Option<KeyDeqNodeWo<K>> { 203 + self.info.write_order_q_node() 204 + } 205 + 206 + pub(crate) fn set_write_order_q_node(&self, node: Option<KeyDeqNodeWo<K>>) { 207 + self.info.set_write_order_q_node(node) 208 + } 209 + 210 + pub(crate) fn take_write_order_q_node(&self) -> Option<KeyDeqNodeWo<K>> { 211 + self.info.take_write_order_q_node() 212 + } 213 + 214 + pub(crate) fn unset_q_nodes(&self) { 215 + self.info.unset_q_nodes(); 216 + } 217 + } 218 + 219 + impl<K, V> AccessTime for TrioArc<ValueEntry<K, V>> { 220 + #[inline] 221 + fn last_accessed(&self) -> Option<Instant> { 222 + self.info.last_accessed() 223 + } 224 + 225 + #[inline] 226 + fn set_last_accessed(&self, timestamp: Instant) { 227 + self.info.set_last_accessed(timestamp); 228 + } 229 + 230 + #[inline] 231 + fn last_modified(&self) -> Option<Instant> { 232 + self.info.last_modified() 233 + } 234 + 235 + #[inline] 236 + fn set_last_modified(&self, timestamp: Instant) { 237 + self.info.set_last_modified(timestamp); 238 + } 239 + } 240 + 241 + pub(crate) enum ReadOp<K, V> { 242 + // u64 is the hash of the key. 243 + Hit(u64, TrioArc<ValueEntry<K, V>>, Instant), 244 + Miss(u64), 245 + } 246 + 247 + pub(crate) enum WriteOp<K, V> { 248 + Upsert { 249 + key_hash: KeyHash<K>, 250 + value_entry: TrioArc<ValueEntry<K, V>>, 251 + old_weight: u32, 252 + new_weight: u32, 253 + }, 254 + Remove(KvEntry<K, V>), 255 + }

+35

crates/mini-moka-vendored/src/common/concurrent/atomic_time.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use super::Instant; 2 + 3 + use std::sync::RwLock; 4 + 5 + pub(crate) struct AtomicInstant { 6 + instant: RwLock<Option<Instant>>, 7 + } 8 + 9 + impl Default for AtomicInstant { 10 + fn default() -> Self { 11 + Self { 12 + instant: RwLock::new(None), 13 + } 14 + } 15 + } 16 + 17 + impl AtomicInstant { 18 + pub(crate) fn new(timestamp: Instant) -> Self { 19 + let ai = Self::default(); 20 + ai.set_instant(timestamp); 21 + ai 22 + } 23 + 24 + pub(crate) fn is_set(&self) -> bool { 25 + self.instant.read().expect("lock poisoned").is_some() 26 + } 27 + 28 + pub(crate) fn instant(&self) -> Option<Instant> { 29 + *self.instant.read().expect("lock poisoned") 30 + } 31 + 32 + pub(crate) fn set_instant(&self, instant: Instant) { 33 + *self.instant.write().expect("lock poisoned") = Some(instant); 34 + } 35 + }

+10

crates/mini-moka-vendored/src/common/concurrent/constants.rs

··· 0 0 0 0 0 0 0 0 0 0

··· 1 + pub(crate) const MAX_SYNC_REPEATS: usize = 4; 2 + pub(crate) const PERIODICAL_SYNC_INTERVAL_MILLIS: u64 = 500; 3 + 4 + pub(crate) const READ_LOG_FLUSH_POINT: usize = 64; 5 + pub(crate) const READ_LOG_SIZE: usize = READ_LOG_FLUSH_POINT * (MAX_SYNC_REPEATS + 2); 6 + 7 + pub(crate) const WRITE_LOG_FLUSH_POINT: usize = 64; 8 + pub(crate) const WRITE_LOG_SIZE: usize = WRITE_LOG_FLUSH_POINT * (MAX_SYNC_REPEATS + 2); 9 + 10 + pub(crate) const WRITE_RETRY_INTERVAL_MICROS: u64 = 50;

+181

crates/mini-moka-vendored/src/common/concurrent/deques.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use super::{KeyDate, KeyHashDate, ValueEntry}; 2 + use crate::common::{ 3 + deque::{DeqNode, Deque}, 4 + CacheRegion, 5 + }; 6 + 7 + use std::ptr::NonNull; 8 + use tagptr::TagNonNull; 9 + use triomphe::Arc as TrioArc; 10 + pub(crate) struct Deques<K> { 11 + pub(crate) window: Deque<KeyHashDate<K>>, // Not used yet. 12 + pub(crate) probation: Deque<KeyHashDate<K>>, 13 + pub(crate) protected: Deque<KeyHashDate<K>>, // Not used yet. 14 + pub(crate) write_order: Deque<KeyDate<K>>, 15 + } 16 + 17 + impl<K> Default for Deques<K> { 18 + fn default() -> Self { 19 + Self { 20 + window: Deque::new(CacheRegion::Window), 21 + probation: Deque::new(CacheRegion::MainProbation), 22 + protected: Deque::new(CacheRegion::MainProtected), 23 + write_order: Deque::new(CacheRegion::Other), 24 + } 25 + } 26 + } 27 + 28 + impl<K> Deques<K> { 29 + pub(crate) fn push_back_ao<V>( 30 + &mut self, 31 + region: CacheRegion, 32 + khd: KeyHashDate<K>, 33 + entry: &TrioArc<ValueEntry<K, V>>, 34 + ) { 35 + let node = Box::new(DeqNode::new(khd)); 36 + let node = match region { 37 + CacheRegion::Window => self.window.push_back(node), 38 + CacheRegion::MainProbation => self.probation.push_back(node), 39 + CacheRegion::MainProtected => self.protected.push_back(node), 40 + _ => unreachable!(), 41 + }; 42 + let tagged_node = TagNonNull::compose(node, region as usize); 43 + entry.set_access_order_q_node(Some(tagged_node)); 44 + } 45 + 46 + pub(crate) fn push_back_wo<V>(&mut self, kd: KeyDate<K>, entry: &TrioArc<ValueEntry<K, V>>) { 47 + let node = Box::new(DeqNode::new(kd)); 48 + let node = self.write_order.push_back(node); 49 + entry.set_write_order_q_node(Some(node)); 50 + } 51 + 52 + pub(crate) fn move_to_back_ao<V>(&mut self, entry: &TrioArc<ValueEntry<K, V>>) { 53 + if let Some(tagged_node) = entry.access_order_q_node() { 54 + let (node, tag) = tagged_node.decompose(); 55 + let p = unsafe { node.as_ref() }; 56 + match tag.into() { 57 + CacheRegion::Window if self.window.contains(p) => { 58 + unsafe { self.window.move_to_back(node) }; 59 + } 60 + CacheRegion::MainProbation if self.probation.contains(p) => { 61 + unsafe { self.probation.move_to_back(node) }; 62 + } 63 + CacheRegion::MainProtected if self.protected.contains(p) => { 64 + unsafe { self.protected.move_to_back(node) }; 65 + } 66 + _ => unreachable!(), 67 + } 68 + } 69 + } 70 + 71 + pub(crate) fn move_to_back_ao_in_deque<V>( 72 + deq_name: &str, 73 + deq: &mut Deque<KeyHashDate<K>>, 74 + entry: &TrioArc<ValueEntry<K, V>>, 75 + ) { 76 + if let Some(tagged_node) = entry.access_order_q_node() { 77 + let (node, tag) = tagged_node.decompose(); 78 + let p = unsafe { node.as_ref() }; 79 + if deq.region() == tag { 80 + if deq.contains(p) { 81 + unsafe { deq.move_to_back(node) }; 82 + } 83 + } else { 84 + panic!( 85 + "move_to_back_ao_in_deque - node is not a member of {} deque. {:?}", 86 + deq_name, p, 87 + ) 88 + } 89 + } 90 + } 91 + 92 + pub(crate) fn move_to_back_wo<V>(&mut self, entry: &TrioArc<ValueEntry<K, V>>) { 93 + if let Some(node) = entry.write_order_q_node() { 94 + let p = unsafe { node.as_ref() }; 95 + if self.write_order.contains(p) { 96 + unsafe { self.write_order.move_to_back(node) }; 97 + } 98 + } 99 + } 100 + 101 + pub(crate) fn move_to_back_wo_in_deque<V>( 102 + deq: &mut Deque<KeyDate<K>>, 103 + entry: &TrioArc<ValueEntry<K, V>>, 104 + ) { 105 + if let Some(node) = entry.write_order_q_node() { 106 + let p = unsafe { node.as_ref() }; 107 + if deq.contains(p) { 108 + unsafe { deq.move_to_back(node) }; 109 + } 110 + } 111 + } 112 + 113 + pub(crate) fn unlink_ao<V>(&mut self, entry: &TrioArc<ValueEntry<K, V>>) { 114 + if let Some(node) = entry.take_access_order_q_node() { 115 + self.unlink_node_ao(node); 116 + } 117 + } 118 + 119 + pub(crate) fn unlink_ao_from_deque<V>( 120 + deq_name: &str, 121 + deq: &mut Deque<KeyHashDate<K>>, 122 + entry: &TrioArc<ValueEntry<K, V>>, 123 + ) { 124 + if let Some(node) = entry.take_access_order_q_node() { 125 + unsafe { Self::unlink_node_ao_from_deque(deq_name, deq, node) }; 126 + } 127 + } 128 + 129 + pub(crate) fn unlink_wo<V>(deq: &mut Deque<KeyDate<K>>, entry: &TrioArc<ValueEntry<K, V>>) { 130 + if let Some(node) = entry.take_write_order_q_node() { 131 + Self::unlink_node_wo(deq, node); 132 + } 133 + } 134 + 135 + pub(crate) fn unlink_node_ao(&mut self, tagged_node: TagNonNull<DeqNode<KeyHashDate<K>>, 2>) { 136 + unsafe { 137 + match tagged_node.decompose_tag().into() { 138 + CacheRegion::Window => { 139 + Self::unlink_node_ao_from_deque("window", &mut self.window, tagged_node) 140 + } 141 + CacheRegion::MainProbation => { 142 + Self::unlink_node_ao_from_deque("probation", &mut self.probation, tagged_node) 143 + } 144 + CacheRegion::MainProtected => { 145 + Self::unlink_node_ao_from_deque("protected", &mut self.protected, tagged_node) 146 + } 147 + _ => unreachable!(), 148 + } 149 + } 150 + } 151 + 152 + unsafe fn unlink_node_ao_from_deque( 153 + deq_name: &str, 154 + deq: &mut Deque<KeyHashDate<K>>, 155 + tagged_node: TagNonNull<DeqNode<KeyHashDate<K>>, 2>, 156 + ) { 157 + let (node, tag) = tagged_node.decompose(); 158 + let p = node.as_ref(); 159 + if deq.region() == tag { 160 + if deq.contains(p) { 161 + // https://github.com/moka-rs/moka/issues/64 162 + deq.unlink_and_drop(node); 163 + } 164 + } else { 165 + panic!( 166 + "unlink_node - node is not a member of {} deque. {:?}", 167 + deq_name, p 168 + ) 169 + } 170 + } 171 + 172 + pub(crate) fn unlink_node_wo(deq: &mut Deque<KeyDate<K>>, node: NonNull<DeqNode<KeyDate<K>>>) { 173 + unsafe { 174 + let p = node.as_ref(); 175 + if deq.contains(p) { 176 + // https://github.com/moka-rs/moka/issues/64 177 + deq.unlink_and_drop(node); 178 + } 179 + } 180 + } 181 + }

+150

crates/mini-moka-vendored/src/common/concurrent/entry_info.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use std::sync::{ 2 + atomic::{AtomicBool, AtomicU32, Ordering}, 3 + Mutex, 4 + }; 5 + 6 + use super::{AccessTime, KeyDeqNodeAo, KeyDeqNodeWo}; 7 + use crate::common::{concurrent::atomic_time::AtomicInstant, time::Instant}; 8 + 9 + pub(crate) struct DeqNodes<K> { 10 + access_order_q_node: Option<KeyDeqNodeAo<K>>, 11 + write_order_q_node: Option<KeyDeqNodeWo<K>>, 12 + } 13 + 14 + // We need this `unsafe impl` as DeqNodes have NonNull pointers. 15 + unsafe impl<K> Send for DeqNodes<K> {} 16 + 17 + pub(crate) struct EntryInfo<K> { 18 + /// `is_admitted` indicates that the entry has been admitted to the 19 + /// cache. When `false`, it means the entry is _temporary_ admitted to 20 + /// the cache or evicted from the cache (so it should not have LRU nodes). 21 + is_admitted: AtomicBool, 22 + /// `is_dirty` indicates that the entry has been inserted (or updated) 23 + /// in the hash table, but the history of the insertion has not yet 24 + /// been applied to the LRU deques and LFU estimator. 25 + is_dirty: AtomicBool, 26 + last_accessed: AtomicInstant, 27 + last_modified: AtomicInstant, 28 + policy_weight: AtomicU32, 29 + nodes: Mutex<DeqNodes<K>>, 30 + } 31 + 32 + impl<K> EntryInfo<K> { 33 + #[inline] 34 + pub(crate) fn new(timestamp: Instant, policy_weight: u32) -> Self { 35 + Self { 36 + is_admitted: Default::default(), 37 + is_dirty: AtomicBool::new(true), 38 + last_accessed: AtomicInstant::new(timestamp), 39 + last_modified: AtomicInstant::new(timestamp), 40 + policy_weight: AtomicU32::new(policy_weight), 41 + nodes: Mutex::new(DeqNodes { 42 + access_order_q_node: None, 43 + write_order_q_node: None, 44 + }), 45 + } 46 + } 47 + 48 + #[inline] 49 + pub(crate) fn is_admitted(&self) -> bool { 50 + self.is_admitted.load(Ordering::Acquire) 51 + } 52 + 53 + #[inline] 54 + pub(crate) fn set_admitted(&self, value: bool) { 55 + self.is_admitted.store(value, Ordering::Release); 56 + } 57 + 58 + #[inline] 59 + pub(crate) fn is_dirty(&self) -> bool { 60 + self.is_dirty.load(Ordering::Acquire) 61 + } 62 + 63 + #[inline] 64 + pub(crate) fn set_dirty(&self, value: bool) { 65 + self.is_dirty.store(value, Ordering::Release); 66 + } 67 + 68 + #[inline] 69 + pub(crate) fn policy_weight(&self) -> u32 { 70 + self.policy_weight.load(Ordering::Acquire) 71 + } 72 + 73 + #[inline] 74 + pub(crate) fn set_policy_weight(&self, size: u32) { 75 + self.policy_weight.store(size, Ordering::Release); 76 + } 77 + 78 + #[inline] 79 + pub(crate) fn access_order_q_node(&self) -> Option<KeyDeqNodeAo<K>> { 80 + self.nodes 81 + .lock() 82 + .expect("lock poisoned") 83 + .access_order_q_node 84 + } 85 + 86 + #[inline] 87 + pub(crate) fn set_access_order_q_node(&self, node: Option<KeyDeqNodeAo<K>>) { 88 + self.nodes 89 + .lock() 90 + .expect("lock poisoned") 91 + .access_order_q_node = node; 92 + } 93 + 94 + #[inline] 95 + pub(crate) fn take_access_order_q_node(&self) -> Option<KeyDeqNodeAo<K>> { 96 + self.nodes 97 + .lock() 98 + .expect("lock poisoned") 99 + .access_order_q_node 100 + .take() 101 + } 102 + 103 + #[inline] 104 + pub(crate) fn write_order_q_node(&self) -> Option<KeyDeqNodeWo<K>> { 105 + self.nodes.lock().expect("lock poisoned").write_order_q_node 106 + } 107 + 108 + #[inline] 109 + pub(crate) fn set_write_order_q_node(&self, node: Option<KeyDeqNodeWo<K>>) { 110 + self.nodes.lock().expect("lock poisoned").write_order_q_node = node; 111 + } 112 + 113 + #[inline] 114 + pub(crate) fn take_write_order_q_node(&self) -> Option<KeyDeqNodeWo<K>> { 115 + self.nodes 116 + .lock() 117 + .expect("lock poisoned") 118 + .write_order_q_node 119 + .take() 120 + } 121 + 122 + #[inline] 123 + pub(crate) fn unset_q_nodes(&self) { 124 + let mut nodes = self.nodes.lock().expect("lock poisoned"); 125 + nodes.access_order_q_node = None; 126 + nodes.write_order_q_node = None; 127 + } 128 + } 129 + 130 + impl<K> AccessTime for EntryInfo<K> { 131 + #[inline] 132 + fn last_accessed(&self) -> Option<Instant> { 133 + self.last_accessed.instant() 134 + } 135 + 136 + #[inline] 137 + fn set_last_accessed(&self, timestamp: Instant) { 138 + self.last_accessed.set_instant(timestamp); 139 + } 140 + 141 + #[inline] 142 + fn last_modified(&self) -> Option<Instant> { 143 + self.last_modified.instant() 144 + } 145 + 146 + #[inline] 147 + fn set_last_modified(&self, timestamp: Instant) { 148 + self.last_modified.set_instant(timestamp); 149 + } 150 + }

+77

crates/mini-moka-vendored/src/common/concurrent/housekeeper.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use super::{ 2 + atomic_time::AtomicInstant, 3 + constants::{ 4 + MAX_SYNC_REPEATS, PERIODICAL_SYNC_INTERVAL_MILLIS, READ_LOG_FLUSH_POINT, 5 + WRITE_LOG_FLUSH_POINT, 6 + }, 7 + }; 8 + 9 + use crate::common::time::{CheckedTimeOps, Instant}; 10 + 11 + use std::{ 12 + sync::atomic::{AtomicBool, Ordering}, 13 + time::Duration, 14 + }; 15 + 16 + pub(crate) trait InnerSync { 17 + fn sync(&self, max_sync_repeats: usize); 18 + fn now(&self) -> Instant; 19 + } 20 + 21 + pub(crate) struct Housekeeper { 22 + is_sync_running: AtomicBool, 23 + sync_after: AtomicInstant, 24 + } 25 + 26 + impl Default for Housekeeper { 27 + fn default() -> Self { 28 + Self { 29 + is_sync_running: Default::default(), 30 + sync_after: AtomicInstant::new(Self::sync_after(Instant::now())), 31 + } 32 + } 33 + } 34 + 35 + impl Housekeeper { 36 + pub(crate) fn should_apply_reads(&self, ch_len: usize, now: Instant) -> bool { 37 + self.should_apply(ch_len, READ_LOG_FLUSH_POINT, now) 38 + } 39 + 40 + pub(crate) fn should_apply_writes(&self, ch_len: usize, now: Instant) -> bool { 41 + self.should_apply(ch_len, WRITE_LOG_FLUSH_POINT, now) 42 + } 43 + 44 + #[inline] 45 + pub(crate) fn should_apply(&self, ch_len: usize, ch_flush_point: usize, now: Instant) -> bool { 46 + ch_len >= ch_flush_point || self.sync_after.instant().unwrap() >= now 47 + } 48 + 49 + pub(crate) fn try_sync<T: InnerSync>(&self, cache: &T) -> bool { 50 + // Try to flip the value of sync_scheduled from false to true. 51 + match self.is_sync_running.compare_exchange( 52 + false, 53 + true, 54 + Ordering::Acquire, 55 + Ordering::Relaxed, 56 + ) { 57 + Ok(_) => { 58 + let now = cache.now(); 59 + self.sync_after.set_instant(Self::sync_after(now)); 60 + 61 + cache.sync(MAX_SYNC_REPEATS); 62 + 63 + self.is_sync_running.store(false, Ordering::Release); 64 + true 65 + } 66 + Err(_) => false, 67 + } 68 + } 69 + 70 + fn sync_after(now: Instant) -> Instant { 71 + let dur = Duration::from_millis(PERIODICAL_SYNC_INTERVAL_MILLIS); 72 + let ts = now.checked_add(dur); 73 + // Assuming that `now` is current wall clock time, this should never fail at 74 + // least next millions of years. 75 + ts.expect("Timestamp overflow") 76 + } 77 + }

+773

crates/mini-moka-vendored/src/common/deque.rs

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··· 1 + // License and Copyright Notice: 2 + // 3 + // Some of the code and doc comments in this module were copied from 4 + // `std::collections::LinkedList` in the Rust standard library. 5 + // https://github.com/rust-lang/rust/blob/master/src/liballoc/collections/linked_list.rs 6 + // 7 + // The original code/comments from LinkedList are dual-licensed under 8 + // the Apache License, Version 2.0 <https://github.com/rust-lang/rust/blob/master/LICENSE-APACHE> 9 + // or the MIT license <https://github.com/rust-lang/rust/blob/master/LICENSE-MIT> 10 + // 11 + // Copyrights of the original code/comments are retained by their contributors. 12 + // For full authorship information, see the version control history of 13 + // https://github.com/rust-lang/rust/ or https://thanks.rust-lang.org 14 + 15 + use std::{marker::PhantomData, ptr::NonNull}; 16 + 17 + use super::CacheRegion; 18 + 19 + // `crate::{sync,unsync}::DeqNodes` uses a `tagptr::TagNonNull<DeqNode<T>, 2>` 20 + // pointer. To reserve the space for the 2-bit tag, use 4 bytes as the *minimum* 21 + // alignment. 22 + // https://doc.rust-lang.org/reference/type-layout.html#the-alignment-modifiers 23 + #[repr(align(4))] 24 + #[derive(PartialEq, Eq)] 25 + pub(crate) struct DeqNode<T> { 26 + next: Option<NonNull<DeqNode<T>>>, 27 + prev: Option<NonNull<DeqNode<T>>>, 28 + pub(crate) element: T, 29 + } 30 + 31 + impl<T> std::fmt::Debug for DeqNode<T> { 32 + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { 33 + f.debug_struct("DeqNode") 34 + .field("next", &self.next) 35 + .field("prev", &self.prev) 36 + .finish() 37 + } 38 + } 39 + 40 + impl<T> DeqNode<T> { 41 + pub(crate) fn new(element: T) -> Self { 42 + Self { 43 + next: None, 44 + prev: None, 45 + element, 46 + } 47 + } 48 + 49 + pub(crate) fn next_node_ptr(this: NonNull<Self>) -> Option<NonNull<DeqNode<T>>> { 50 + unsafe { this.as_ref() }.next 51 + } 52 + } 53 + 54 + /// Cursor is used to remember the current iterating position. 55 + enum DeqCursor<T> { 56 + Node(NonNull<DeqNode<T>>), 57 + Done, 58 + } 59 + 60 + pub(crate) struct Deque<T> { 61 + region: CacheRegion, 62 + len: usize, 63 + head: Option<NonNull<DeqNode<T>>>, 64 + tail: Option<NonNull<DeqNode<T>>>, 65 + cursor: Option<DeqCursor<T>>, 66 + marker: PhantomData<Box<DeqNode<T>>>, 67 + } 68 + 69 + impl<T> Drop for Deque<T> { 70 + fn drop(&mut self) { 71 + struct DropGuard<'a, T>(&'a mut Deque<T>); 72 + 73 + impl<T> Drop for DropGuard<'_, T> { 74 + fn drop(&mut self) { 75 + // Continue the same loop we do below. This only runs when a destructor has 76 + // panicked. If another one panics this will abort. 77 + while self.0.pop_front().is_some() {} 78 + } 79 + } 80 + 81 + while let Some(node) = self.pop_front() { 82 + let guard = DropGuard(self); 83 + drop(node); 84 + std::mem::forget(guard); 85 + } 86 + } 87 + } 88 + 89 + // Inner crate public function/methods 90 + impl<T> Deque<T> { 91 + pub(crate) fn new(region: CacheRegion) -> Self { 92 + Self { 93 + region, 94 + len: 0, 95 + head: None, 96 + tail: None, 97 + cursor: None, 98 + marker: PhantomData, 99 + } 100 + } 101 + 102 + pub(crate) fn region(&self) -> CacheRegion { 103 + self.region 104 + } 105 + 106 + #[cfg(test)] 107 + pub(crate) fn len(&self) -> usize { 108 + self.len 109 + } 110 + 111 + pub(crate) fn contains(&self, node: &DeqNode<T>) -> bool { 112 + node.prev.is_some() || self.is_head(node) 113 + } 114 + 115 + pub(crate) fn peek_front(&self) -> Option<&DeqNode<T>> { 116 + self.head.as_ref().map(|node| unsafe { node.as_ref() }) 117 + } 118 + 119 + pub(crate) fn peek_front_ptr(&self) -> Option<NonNull<DeqNode<T>>> { 120 + self.head.as_ref().cloned() 121 + } 122 + 123 + /// Removes and returns the node at the front of the list. 124 + pub(crate) fn pop_front(&mut self) -> Option<Box<DeqNode<T>>> { 125 + // This method takes care not to create mutable references to whole nodes, 126 + // to maintain validity of aliasing pointers into `element`. 127 + self.head.map(|node| unsafe { 128 + if self.is_at_cursor(node.as_ref()) { 129 + self.advance_cursor(); 130 + } 131 + 132 + let mut node = Box::from_raw(node.as_ptr()); 133 + self.head = node.next; 134 + 135 + match self.head { 136 + None => self.tail = None, 137 + // Not creating new mutable (unique!) references overlapping `element`. 138 + Some(head) => (*head.as_ptr()).prev = None, 139 + } 140 + 141 + self.len -= 1; 142 + 143 + node.prev = None; 144 + node.next = None; 145 + node 146 + }) 147 + } 148 + 149 + #[cfg(test)] 150 + pub(crate) fn peek_back(&self) -> Option<&DeqNode<T>> { 151 + self.tail.as_ref().map(|node| unsafe { node.as_ref() }) 152 + } 153 + 154 + /// Adds the given node to the back of the list. 155 + pub(crate) fn push_back(&mut self, mut node: Box<DeqNode<T>>) -> NonNull<DeqNode<T>> { 156 + // This method takes care not to create mutable references to whole nodes, 157 + // to maintain validity of aliasing pointers into `element`. 158 + unsafe { 159 + node.next = None; 160 + node.prev = self.tail; 161 + let node = NonNull::new(Box::into_raw(node)).expect("Got a null ptr"); 162 + 163 + match self.tail { 164 + None => self.head = Some(node), 165 + // Not creating new mutable (unique!) references overlapping `element`. 166 + Some(tail) => (*tail.as_ptr()).next = Some(node), 167 + } 168 + 169 + self.tail = Some(node); 170 + self.len += 1; 171 + node 172 + } 173 + } 174 + 175 + pub(crate) unsafe fn move_to_back(&mut self, mut node: NonNull<DeqNode<T>>) { 176 + if self.is_tail(node.as_ref()) { 177 + // Already at the tail. Nothing to do. 178 + return; 179 + } 180 + 181 + if self.is_at_cursor(node.as_ref()) { 182 + self.advance_cursor(); 183 + } 184 + 185 + let node = node.as_mut(); // this one is ours now, we can create an &mut. 186 + 187 + // Not creating new mutable (unique!) references overlapping `element`. 188 + match node.prev { 189 + Some(prev) if node.next.is_some() => (*prev.as_ptr()).next = node.next, 190 + Some(..) => (), 191 + // This node is the head node. 192 + None => self.head = node.next, 193 + }; 194 + 195 + // This node is not the tail node. 196 + if let Some(next) = node.next.take() { 197 + (*next.as_ptr()).prev = node.prev; 198 + 199 + let mut node = NonNull::from(node); 200 + match self.tail { 201 + // Not creating new mutable (unique!) references overlapping `element`. 202 + Some(tail) => { 203 + node.as_mut().prev = Some(tail); 204 + (*tail.as_ptr()).next = Some(node) 205 + } 206 + None => unreachable!(), 207 + } 208 + self.tail = Some(node); 209 + } 210 + } 211 + 212 + pub(crate) fn move_front_to_back(&mut self) { 213 + if let Some(node) = self.head { 214 + unsafe { self.move_to_back(node) }; 215 + } 216 + } 217 + 218 + /// Unlinks the specified node from the current list. 219 + /// 220 + /// This method takes care not to create mutable references to `element`, to 221 + /// maintain validity of aliasing pointers. 222 + /// 223 + /// IMPORTANT: This method does not drop the node. If the node is no longer 224 + /// needed, use `unlink_and_drop` instead, or drop it at the caller side. 225 + /// Otherwise, the node will leak. 226 + pub(crate) unsafe fn unlink(&mut self, mut node: NonNull<DeqNode<T>>) { 227 + if self.is_at_cursor(node.as_ref()) { 228 + self.advance_cursor(); 229 + } 230 + 231 + let node = node.as_mut(); // this one is ours now, we can create an &mut. 232 + 233 + // Not creating new mutable (unique!) references overlapping `element`. 234 + match node.prev { 235 + Some(prev) => (*prev.as_ptr()).next = node.next, 236 + // this node is the head node 237 + None => self.head = node.next, 238 + }; 239 + 240 + match node.next { 241 + Some(next) => (*next.as_ptr()).prev = node.prev, 242 + // this node is the tail node 243 + None => self.tail = node.prev, 244 + }; 245 + 246 + node.prev = None; 247 + node.next = None; 248 + 249 + self.len -= 1; 250 + } 251 + 252 + /// Unlinks the specified node from the current list, and then drop the node. 253 + /// 254 + /// This method takes care not to create mutable references to `element`, to 255 + /// maintain validity of aliasing pointers. 256 + /// 257 + /// Panics: 258 + pub(crate) unsafe fn unlink_and_drop(&mut self, node: NonNull<DeqNode<T>>) { 259 + self.unlink(node); 260 + std::mem::drop(Box::from_raw(node.as_ptr())); 261 + } 262 + 263 + #[cfg(test)] 264 + pub(crate) fn reset_cursor(&mut self) { 265 + self.cursor = None; 266 + } 267 + } 268 + 269 + impl<'a, T> Iterator for &'a mut Deque<T> { 270 + type Item = &'a T; 271 + 272 + fn next(&mut self) -> Option<Self::Item> { 273 + if self.cursor.is_none() { 274 + if let Some(head) = self.head { 275 + self.cursor = Some(DeqCursor::Node(head)); 276 + } 277 + } 278 + let elem = if let Some(DeqCursor::Node(node)) = self.cursor { 279 + unsafe { Some(&(*node.as_ptr()).element) } 280 + } else { 281 + None 282 + }; 283 + self.advance_cursor(); 284 + elem 285 + } 286 + } 287 + 288 + // Private function/methods 289 + impl<T> Deque<T> { 290 + fn is_head(&self, node: &DeqNode<T>) -> bool { 291 + if let Some(head) = self.head { 292 + std::ptr::eq(unsafe { head.as_ref() }, node) 293 + } else { 294 + false 295 + } 296 + } 297 + 298 + fn is_tail(&self, node: &DeqNode<T>) -> bool { 299 + if let Some(tail) = self.tail { 300 + std::ptr::eq(unsafe { tail.as_ref() }, node) 301 + } else { 302 + false 303 + } 304 + } 305 + 306 + fn is_at_cursor(&self, node: &DeqNode<T>) -> bool { 307 + if let Some(DeqCursor::Node(cur_node)) = self.cursor { 308 + std::ptr::eq(unsafe { cur_node.as_ref() }, node) 309 + } else { 310 + false 311 + } 312 + } 313 + 314 + fn advance_cursor(&mut self) { 315 + match self.cursor.take() { 316 + None => (), 317 + Some(DeqCursor::Node(node)) => unsafe { 318 + if let Some(next) = (*node.as_ptr()).next { 319 + self.cursor = Some(DeqCursor::Node(next)); 320 + } else { 321 + self.cursor = Some(DeqCursor::Done); 322 + } 323 + }, 324 + Some(DeqCursor::Done) => { 325 + self.cursor = None; 326 + } 327 + } 328 + } 329 + } 330 + 331 + #[cfg(test)] 332 + mod tests { 333 + use super::{CacheRegion::MainProbation, DeqNode, Deque}; 334 + 335 + #[test] 336 + #[allow(clippy::cognitive_complexity)] 337 + fn basics() { 338 + let mut deque: Deque<String> = Deque::new(MainProbation); 339 + assert_eq!(deque.len(), 0); 340 + assert!(deque.peek_front().is_none()); 341 + assert!(deque.peek_back().is_none()); 342 + 343 + // push_back(node1) 344 + let node1 = DeqNode::new("a".to_string()); 345 + assert!(!deque.contains(&node1)); 346 + let node1 = Box::new(node1); 347 + let node1_ptr = deque.push_back(node1); 348 + assert_eq!(deque.len(), 1); 349 + 350 + // peek_front() -> node1 351 + let head_a = deque.peek_front().unwrap(); 352 + assert!(deque.contains(head_a)); 353 + assert!(deque.is_head(head_a)); 354 + assert!(deque.is_tail(head_a)); 355 + assert_eq!(head_a.element, "a".to_string()); 356 + 357 + // move_to_back(node1) 358 + unsafe { deque.move_to_back(node1_ptr) }; 359 + assert_eq!(deque.len(), 1); 360 + 361 + // peek_front() -> node1 362 + let head_b = deque.peek_front().unwrap(); 363 + assert!(deque.contains(head_b)); 364 + assert!(deque.is_head(head_b)); 365 + assert!(deque.is_tail(head_b)); 366 + assert!(std::ptr::eq(head_b, node1_ptr.as_ptr())); 367 + assert!(head_b.prev.is_none()); 368 + assert!(head_b.next.is_none()); 369 + 370 + // peek_back() -> node1 371 + let tail_a = deque.peek_back().unwrap(); 372 + assert!(deque.contains(tail_a)); 373 + assert!(deque.is_head(tail_a)); 374 + assert!(deque.is_tail(tail_a)); 375 + assert!(std::ptr::eq(tail_a, node1_ptr.as_ptr())); 376 + assert!(tail_a.prev.is_none()); 377 + assert!(tail_a.next.is_none()); 378 + 379 + // push_back(node2) 380 + let node2 = DeqNode::new("b".to_string()); 381 + assert!(!deque.contains(&node2)); 382 + let node2_ptr = deque.push_back(Box::new(node2)); 383 + assert_eq!(deque.len(), 2); 384 + 385 + // peek_front() -> node1 386 + let head_c = deque.peek_front().unwrap(); 387 + assert!(deque.contains(head_c)); 388 + assert!(deque.is_head(head_c)); 389 + assert!(!deque.is_tail(head_c)); 390 + assert!(std::ptr::eq(head_c, node1_ptr.as_ptr())); 391 + assert!(head_c.prev.is_none()); 392 + assert!(std::ptr::eq( 393 + head_c.next.unwrap().as_ptr(), 394 + node2_ptr.as_ptr() 395 + )); 396 + 397 + // move_to_back(node2) 398 + unsafe { deque.move_to_back(node2_ptr) }; 399 + assert_eq!(deque.len(), 2); 400 + 401 + // peek_front() -> node1 402 + let head_d = deque.peek_front().unwrap(); 403 + assert!(deque.contains(head_d)); 404 + assert!(deque.is_head(head_d)); 405 + assert!(!deque.is_tail(head_d)); 406 + assert!(std::ptr::eq(head_d, node1_ptr.as_ptr())); 407 + assert!(head_d.prev.is_none()); 408 + assert!(std::ptr::eq( 409 + head_d.next.unwrap().as_ptr(), 410 + node2_ptr.as_ptr() 411 + )); 412 + 413 + // peek_back() -> node2 414 + let tail_b = deque.peek_back().unwrap(); 415 + assert!(deque.contains(tail_b)); 416 + assert!(!deque.is_head(tail_b)); 417 + assert!(deque.is_tail(tail_b)); 418 + assert!(std::ptr::eq(tail_b, node2_ptr.as_ptr())); 419 + assert!(std::ptr::eq( 420 + tail_b.prev.unwrap().as_ptr(), 421 + node1_ptr.as_ptr() 422 + )); 423 + assert_eq!(tail_b.element, "b".to_string()); 424 + assert!(tail_b.next.is_none()); 425 + 426 + // move_to_back(node1) 427 + unsafe { deque.move_to_back(node1_ptr) }; 428 + assert_eq!(deque.len(), 2); 429 + 430 + // peek_front() -> node2 431 + let head_e = deque.peek_front().unwrap(); 432 + assert!(deque.contains(head_e)); 433 + assert!(deque.is_head(head_e)); 434 + assert!(!deque.is_tail(head_e)); 435 + assert!(std::ptr::eq(head_e, node2_ptr.as_ptr())); 436 + assert!(head_e.prev.is_none()); 437 + assert!(std::ptr::eq( 438 + head_e.next.unwrap().as_ptr(), 439 + node1_ptr.as_ptr() 440 + )); 441 + 442 + // peek_back() -> node1 443 + let tail_c = deque.peek_back().unwrap(); 444 + assert!(deque.contains(tail_c)); 445 + assert!(!deque.is_head(tail_c)); 446 + assert!(deque.is_tail(tail_c)); 447 + assert!(std::ptr::eq(tail_c, node1_ptr.as_ptr())); 448 + assert!(std::ptr::eq( 449 + tail_c.prev.unwrap().as_ptr(), 450 + node2_ptr.as_ptr() 451 + )); 452 + assert!(tail_c.next.is_none()); 453 + 454 + // push_back(node3) 455 + let node3 = DeqNode::new("c".to_string()); 456 + assert!(!deque.contains(&node3)); 457 + let node3_ptr = deque.push_back(Box::new(node3)); 458 + assert_eq!(deque.len(), 3); 459 + 460 + // peek_front() -> node2 461 + let head_f = deque.peek_front().unwrap(); 462 + assert!(deque.contains(head_f)); 463 + assert!(deque.is_head(head_f)); 464 + assert!(!deque.is_tail(head_f)); 465 + assert!(std::ptr::eq(head_f, node2_ptr.as_ptr())); 466 + assert!(head_f.prev.is_none()); 467 + assert!(std::ptr::eq( 468 + head_f.next.unwrap().as_ptr(), 469 + node1_ptr.as_ptr() 470 + )); 471 + 472 + // peek_back() -> node3 473 + let tail_d = deque.peek_back().unwrap(); 474 + assert!(std::ptr::eq(tail_d, node3_ptr.as_ptr())); 475 + assert_eq!(tail_d.element, "c".to_string()); 476 + assert!(deque.contains(tail_d)); 477 + assert!(!deque.is_head(tail_d)); 478 + assert!(deque.is_tail(tail_d)); 479 + assert!(std::ptr::eq(tail_d, node3_ptr.as_ptr())); 480 + assert!(std::ptr::eq( 481 + tail_d.prev.unwrap().as_ptr(), 482 + node1_ptr.as_ptr() 483 + )); 484 + assert!(tail_d.next.is_none()); 485 + 486 + // move_to_back(node1) 487 + unsafe { deque.move_to_back(node1_ptr) }; 488 + assert_eq!(deque.len(), 3); 489 + 490 + // peek_front() -> node2 491 + let head_g = deque.peek_front().unwrap(); 492 + assert!(deque.contains(head_g)); 493 + assert!(deque.is_head(head_g)); 494 + assert!(!deque.is_tail(head_g)); 495 + assert!(std::ptr::eq(head_g, node2_ptr.as_ptr())); 496 + assert!(head_g.prev.is_none()); 497 + assert!(std::ptr::eq( 498 + head_g.next.unwrap().as_ptr(), 499 + node3_ptr.as_ptr() 500 + )); 501 + 502 + // peek_back() -> node1 503 + let tail_e = deque.peek_back().unwrap(); 504 + assert!(deque.contains(tail_e)); 505 + assert!(!deque.is_head(tail_e)); 506 + assert!(deque.is_tail(tail_e)); 507 + assert!(std::ptr::eq(tail_e, node1_ptr.as_ptr())); 508 + assert!(std::ptr::eq( 509 + tail_e.prev.unwrap().as_ptr(), 510 + node3_ptr.as_ptr() 511 + )); 512 + assert!(tail_e.next.is_none()); 513 + 514 + // unlink(node3) 515 + unsafe { deque.unlink(node3_ptr) }; 516 + assert_eq!(deque.len(), 2); 517 + let node3_ref = unsafe { node3_ptr.as_ref() }; 518 + assert!(!deque.contains(node3_ref)); 519 + assert!(node3_ref.next.is_none()); 520 + assert!(node3_ref.next.is_none()); 521 + std::mem::drop(unsafe { Box::from_raw(node3_ptr.as_ptr()) }); 522 + 523 + // peek_front() -> node2 524 + let head_h = deque.peek_front().unwrap(); 525 + assert!(deque.contains(head_h)); 526 + assert!(deque.is_head(head_h)); 527 + assert!(!deque.is_tail(head_h)); 528 + assert!(std::ptr::eq(head_h, node2_ptr.as_ptr())); 529 + assert!(head_h.prev.is_none()); 530 + assert!(std::ptr::eq( 531 + head_h.next.unwrap().as_ptr(), 532 + node1_ptr.as_ptr() 533 + )); 534 + 535 + // peek_back() -> node1 536 + let tail_f = deque.peek_back().unwrap(); 537 + assert!(deque.contains(tail_f)); 538 + assert!(!deque.is_head(tail_f)); 539 + assert!(deque.is_tail(tail_f)); 540 + assert!(std::ptr::eq(tail_f, node1_ptr.as_ptr())); 541 + assert!(std::ptr::eq( 542 + tail_f.prev.unwrap().as_ptr(), 543 + node2_ptr.as_ptr() 544 + )); 545 + assert!(tail_f.next.is_none()); 546 + 547 + // unlink(node2) 548 + unsafe { deque.unlink(node2_ptr) }; 549 + assert_eq!(deque.len(), 1); 550 + let node2_ref = unsafe { node2_ptr.as_ref() }; 551 + assert!(!deque.contains(node2_ref)); 552 + assert!(node2_ref.next.is_none()); 553 + assert!(node2_ref.next.is_none()); 554 + std::mem::drop(unsafe { Box::from_raw(node2_ptr.as_ptr()) }); 555 + 556 + // peek_front() -> node1 557 + let head_g = deque.peek_front().unwrap(); 558 + assert!(deque.contains(head_g)); 559 + assert!(deque.is_head(head_g)); 560 + assert!(deque.is_tail(head_g)); 561 + assert!(std::ptr::eq(head_g, node1_ptr.as_ptr())); 562 + assert!(head_g.prev.is_none()); 563 + assert!(head_g.next.is_none()); 564 + 565 + // peek_back() -> node1 566 + let tail_g = deque.peek_back().unwrap(); 567 + assert!(deque.contains(tail_g)); 568 + assert!(deque.is_head(tail_g)); 569 + assert!(deque.is_tail(tail_g)); 570 + assert!(std::ptr::eq(tail_g, node1_ptr.as_ptr())); 571 + assert!(tail_g.next.is_none()); 572 + assert!(tail_g.next.is_none()); 573 + 574 + // unlink(node1) 575 + unsafe { deque.unlink(node1_ptr) }; 576 + assert_eq!(deque.len(), 0); 577 + let node1_ref = unsafe { node1_ptr.as_ref() }; 578 + assert!(!deque.contains(node1_ref)); 579 + assert!(node1_ref.next.is_none()); 580 + assert!(node1_ref.next.is_none()); 581 + std::mem::drop(unsafe { Box::from_raw(node1_ptr.as_ptr()) }); 582 + 583 + // peek_front() -> node1 584 + let head_h = deque.peek_front(); 585 + assert!(head_h.is_none()); 586 + 587 + // peek_back() -> node1 588 + let tail_e = deque.peek_back(); 589 + assert!(tail_e.is_none()); 590 + } 591 + 592 + #[test] 593 + fn iter() { 594 + let mut deque: Deque<String> = Deque::new(MainProbation); 595 + assert!((&mut deque).next().is_none()); 596 + 597 + let node1 = DeqNode::new("a".into()); 598 + deque.push_back(Box::new(node1)); 599 + let node2 = DeqNode::new("b".into()); 600 + let node2_ptr = deque.push_back(Box::new(node2)); 601 + let node3 = DeqNode::new("c".into()); 602 + let node3_ptr = deque.push_back(Box::new(node3)); 603 + 604 + // ------------------------------------------------------- 605 + // First iteration. 606 + assert_eq!((&mut deque).next(), Some(&"a".into())); 607 + assert_eq!((&mut deque).next(), Some(&"b".into())); 608 + assert_eq!((&mut deque).next(), Some(&"c".into())); 609 + assert!((&mut deque).next().is_none()); 610 + 611 + // ------------------------------------------------------- 612 + // Ensure the iterator restarts. 613 + assert_eq!((&mut deque).next(), Some(&"a".into())); 614 + assert_eq!((&mut deque).next(), Some(&"b".into())); 615 + assert_eq!((&mut deque).next(), Some(&"c".into())); 616 + assert!((&mut deque).next().is_none()); 617 + 618 + // ------------------------------------------------------- 619 + // Ensure reset_cursor works. 620 + assert_eq!((&mut deque).next(), Some(&"a".into())); 621 + assert_eq!((&mut deque).next(), Some(&"b".into())); 622 + deque.reset_cursor(); 623 + assert_eq!((&mut deque).next(), Some(&"a".into())); 624 + assert_eq!((&mut deque).next(), Some(&"b".into())); 625 + assert_eq!((&mut deque).next(), Some(&"c".into())); 626 + assert!((&mut deque).next().is_none()); 627 + 628 + // ------------------------------------------------------- 629 + // Try to move_to_back during iteration. 630 + assert_eq!((&mut deque).next(), Some(&"a".into())); 631 + // Next will be "b", but we move it to the back. 632 + unsafe { deque.move_to_back(node2_ptr) }; 633 + // Now, next should be "c", and then "b". 634 + assert_eq!((&mut deque).next(), Some(&"c".into())); 635 + assert_eq!((&mut deque).next(), Some(&"b".into())); 636 + assert!((&mut deque).next().is_none()); 637 + 638 + // ------------------------------------------------------- 639 + // Try to unlink during iteration. 640 + assert_eq!((&mut deque).next(), Some(&"a".into())); 641 + // Next will be "c", but we unlink it. 642 + unsafe { deque.unlink_and_drop(node3_ptr) }; 643 + // Now, next should be "b". 644 + assert_eq!((&mut deque).next(), Some(&"b".into())); 645 + assert!((&mut deque).next().is_none()); 646 + 647 + // ------------------------------------------------------- 648 + // Try pop_front during iteration. 649 + let node3 = DeqNode::new("c".into()); 650 + deque.push_back(Box::new(node3)); 651 + 652 + assert_eq!((&mut deque).next(), Some(&"a".into())); 653 + // Next will be "b", but we call pop_front twice to remove "a" and "b". 654 + deque.pop_front(); // "a" 655 + deque.pop_front(); // "b" 656 + // Now, next should be "c". 657 + assert_eq!((&mut deque).next(), Some(&"c".into())); 658 + assert!((&mut deque).next().is_none()); 659 + 660 + // ------------------------------------------------------- 661 + // Check iterating on an empty deque. 662 + deque.pop_front(); // "c" 663 + assert!((&mut deque).next().is_none()); 664 + assert!((&mut deque).next().is_none()); 665 + } 666 + 667 + #[test] 668 + fn next_node() { 669 + let mut deque: Deque<String> = Deque::new(MainProbation); 670 + 671 + let node1 = DeqNode::new("a".into()); 672 + deque.push_back(Box::new(node1)); 673 + let node2 = DeqNode::new("b".into()); 674 + let node2_ptr = deque.push_back(Box::new(node2)); 675 + let node3 = DeqNode::new("c".into()); 676 + let node3_ptr = deque.push_back(Box::new(node3)); 677 + 678 + // ------------------------------------------------------- 679 + // First iteration. 680 + // peek_front() -> node1 681 + let node1a = deque.peek_front_ptr().unwrap(); 682 + assert_eq!(unsafe { node1a.as_ref() }.element, "a".to_string()); 683 + let node2a = DeqNode::next_node_ptr(node1a).unwrap(); 684 + assert_eq!(unsafe { node2a.as_ref() }.element, "b".to_string()); 685 + let node3a = DeqNode::next_node_ptr(node2a).unwrap(); 686 + assert_eq!(unsafe { node3a.as_ref() }.element, "c".to_string()); 687 + assert!(DeqNode::next_node_ptr(node3a).is_none()); 688 + 689 + // ------------------------------------------------------- 690 + // Iterate after a move_to_back. 691 + // Move "b" to the back. So now "a" -> "c" -> "b". 692 + unsafe { deque.move_to_back(node2_ptr) }; 693 + let node1a = deque.peek_front_ptr().unwrap(); 694 + assert_eq!(unsafe { node1a.as_ref() }.element, "a".to_string()); 695 + let node3a = DeqNode::next_node_ptr(node1a).unwrap(); 696 + assert_eq!(unsafe { node3a.as_ref() }.element, "c".to_string()); 697 + let node2a = DeqNode::next_node_ptr(node3a).unwrap(); 698 + assert_eq!(unsafe { node2a.as_ref() }.element, "b".to_string()); 699 + assert!(DeqNode::next_node_ptr(node2a).is_none()); 700 + 701 + // ------------------------------------------------------- 702 + // Iterate after an unlink. 703 + // Unlink the second node "c". Now "a" -> "c". 704 + unsafe { deque.unlink_and_drop(node3_ptr) }; 705 + let node1a = deque.peek_front_ptr().unwrap(); 706 + assert_eq!(unsafe { node1a.as_ref() }.element, "a".to_string()); 707 + let node2a = DeqNode::next_node_ptr(node1a).unwrap(); 708 + assert_eq!(unsafe { node2a.as_ref() }.element, "b".to_string()); 709 + assert!(DeqNode::next_node_ptr(node2a).is_none()); 710 + } 711 + 712 + #[test] 713 + fn peek_and_move_to_back() { 714 + let mut deque: Deque<String> = Deque::new(MainProbation); 715 + 716 + let node1 = DeqNode::new("a".into()); 717 + deque.push_back(Box::new(node1)); 718 + let node2 = DeqNode::new("b".into()); 719 + let _ = deque.push_back(Box::new(node2)); 720 + let node3 = DeqNode::new("c".into()); 721 + let _ = deque.push_back(Box::new(node3)); 722 + // "a" -> "b" -> "c" 723 + 724 + let node1a = deque.peek_front_ptr().unwrap(); 725 + assert_eq!(unsafe { node1a.as_ref() }.element, "a".to_string()); 726 + unsafe { deque.move_to_back(node1a) }; 727 + // "b" -> "c" -> "a" 728 + 729 + let node2a = deque.peek_front_ptr().unwrap(); 730 + assert_eq!(unsafe { node2a.as_ref() }.element, "b".to_string()); 731 + 732 + let node3a = DeqNode::next_node_ptr(node2a).unwrap(); 733 + assert_eq!(unsafe { node3a.as_ref() }.element, "c".to_string()); 734 + unsafe { deque.move_to_back(node3a) }; 735 + // "b" -> "a" -> "c" 736 + 737 + deque.move_front_to_back(); 738 + // "a" -> "c" -> "b" 739 + 740 + let node1b = deque.peek_front().unwrap(); 741 + assert_eq!(node1b.element, "a".to_string()); 742 + } 743 + 744 + #[test] 745 + fn drop() { 746 + use std::{cell::RefCell, rc::Rc}; 747 + 748 + struct X(u32, Rc<RefCell<Vec<u32>>>); 749 + 750 + impl Drop for X { 751 + fn drop(&mut self) { 752 + self.1.borrow_mut().push(self.0) 753 + } 754 + } 755 + 756 + let mut deque: Deque<X> = Deque::new(MainProbation); 757 + let dropped = Rc::new(RefCell::new(Vec::default())); 758 + 759 + let node1 = DeqNode::new(X(1, Rc::clone(&dropped))); 760 + let node2 = DeqNode::new(X(2, Rc::clone(&dropped))); 761 + let node3 = DeqNode::new(X(3, Rc::clone(&dropped))); 762 + let node4 = DeqNode::new(X(4, Rc::clone(&dropped))); 763 + deque.push_back(Box::new(node1)); 764 + deque.push_back(Box::new(node2)); 765 + deque.push_back(Box::new(node3)); 766 + deque.push_back(Box::new(node4)); 767 + assert_eq!(deque.len(), 4); 768 + 769 + std::mem::drop(deque); 770 + 771 + assert_eq!(*dropped.borrow(), &[1, 2, 3, 4]); 772 + } 773 + }

+392

crates/mini-moka-vendored/src/common/frequency_sketch.rs

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··· 1 + // License and Copyright Notice: 2 + // 3 + // Some of the code and doc comments in this module were ported or copied from 4 + // a Java class `com.github.benmanes.caffeine.cache.FrequencySketch` of Caffeine. 5 + // https://github.com/ben-manes/caffeine/blob/master/caffeine/src/main/java/com/github/benmanes/caffeine/cache/FrequencySketch.java 6 + // 7 + // The original code/comments from Caffeine are licensed under the Apache License, 8 + // Version 2.0 <https://github.com/ben-manes/caffeine/blob/master/LICENSE> 9 + // 10 + // Copyrights of the original code/comments are retained by their contributors. 11 + // For full authorship information, see the version control history of 12 + // https://github.com/ben-manes/caffeine/ 13 + 14 + /// A probabilistic multi-set for estimating the popularity of an element within 15 + /// a time window. The maximum frequency of an element is limited to 15 (4-bits) 16 + /// and an aging process periodically halves the popularity of all elements. 17 + #[derive(Default)] 18 + pub(crate) struct FrequencySketch { 19 + sample_size: u32, 20 + table_mask: u32, 21 + table: Box<[u64]>, 22 + size: u32, 23 + } 24 + 25 + // A mixture of seeds from FNV-1a, CityHash, and Murmur3. (Taken from Caffeine) 26 + static SEED: [u64; 4] = [ 27 + 0xc3a5_c85c_97cb_3127, 28 + 0xb492_b66f_be98_f273, 29 + 0x9ae1_6a3b_2f90_404f, 30 + 0xcbf2_9ce4_8422_2325, 31 + ]; 32 + 33 + static RESET_MASK: u64 = 0x7777_7777_7777_7777; 34 + 35 + static ONE_MASK: u64 = 0x1111_1111_1111_1111; 36 + 37 + // ------------------------------------------------------------------------------- 38 + // Some of the code and doc comments in this module were ported or copied from 39 + // a Java class `com.github.benmanes.caffeine.cache.FrequencySketch` of Caffeine. 40 + // https://github.com/ben-manes/caffeine/blob/master/caffeine/src/main/java/com/github/benmanes/caffeine/cache/FrequencySketch.java 41 + // ------------------------------------------------------------------------------- 42 + // 43 + // FrequencySketch maintains a 4-bit CountMinSketch [1] with periodic aging to 44 + // provide the popularity history for the TinyLfu admission policy [2]. 45 + // The time and space efficiency of the sketch allows it to cheaply estimate the 46 + // frequency of an entry in a stream of cache access events. 47 + // 48 + // The counter matrix is represented as a single dimensional array holding 16 49 + // counters per slot. A fixed depth of four balances the accuracy and cost, 50 + // resulting in a width of four times the length of the array. To retain an 51 + // accurate estimation the array's length equals the maximum number of entries 52 + // in the cache, increased to the closest power-of-two to exploit more efficient 53 + // bit masking. This configuration results in a confidence of 93.75% and error 54 + // bound of e / width. 55 + // 56 + // The frequency of all entries is aged periodically using a sampling window 57 + // based on the maximum number of entries in the cache. This is referred to as 58 + // the reset operation by TinyLfu and keeps the sketch fresh by dividing all 59 + // counters by two and subtracting based on the number of odd counters 60 + // found. The O(n) cost of aging is amortized, ideal for hardware pre-fetching, 61 + // and uses inexpensive bit manipulations per array location. 62 + // 63 + // [1] An Improved Data Stream Summary: The Count-Min Sketch and its Applications 64 + // http://dimacs.rutgers.edu/~graham/pubs/papers/cm-full.pdf 65 + // [2] TinyLFU: A Highly Efficient Cache Admission Policy 66 + // https://dl.acm.org/citation.cfm?id=3149371 67 + // 68 + // ------------------------------------------------------------------------------- 69 + 70 + impl FrequencySketch { 71 + /// Initializes and increases the capacity of this `FrequencySketch` instance, 72 + /// if necessary, to ensure that it can accurately estimate the popularity of 73 + /// elements given the maximum size of the cache. This operation forgets all 74 + /// previous counts when resizing. 75 + pub(crate) fn ensure_capacity(&mut self, cap: u32) { 76 + // The max byte size of the table, Box<[u64; table_size]> 77 + // 78 + // | Pointer width | Max size | 79 + // |:-----------------|---------:| 80 + // | 16 bit | 8 KiB | 81 + // | 32 bit | 128 MiB | 82 + // | 64 bit or bigger | 8 GiB | 83 + 84 + let maximum = if cfg!(target_pointer_width = "16") { 85 + cap.min(1024) 86 + } else if cfg!(target_pointer_width = "32") { 87 + cap.min(2u32.pow(24)) // about 16 millions 88 + } else { 89 + // Same to Caffeine's limit: 90 + // `Integer.MAX_VALUE >>> 1` with `ceilingPowerOfTwo()` applied. 91 + cap.min(2u32.pow(30)) // about 1 billion 92 + }; 93 + let table_size = if maximum == 0 { 94 + 1 95 + } else { 96 + maximum.next_power_of_two() 97 + }; 98 + 99 + if self.table.len() as u32 >= table_size { 100 + return; 101 + } 102 + 103 + self.table = vec![0; table_size as usize].into_boxed_slice(); 104 + self.table_mask = table_size - 1; 105 + self.sample_size = if cap == 0 { 106 + 10 107 + } else { 108 + maximum.saturating_mul(10).min(i32::MAX as u32) 109 + }; 110 + } 111 + 112 + /// Takes the hash value of an element, and returns the estimated number of 113 + /// occurrences of the element, up to the maximum (15). 114 + pub(crate) fn frequency(&self, hash: u64) -> u8 { 115 + if self.table.is_empty() { 116 + return 0; 117 + } 118 + 119 + let start = ((hash & 3) << 2) as u8; 120 + let mut frequency = u8::MAX; 121 + for i in 0..4 { 122 + let index = self.index_of(hash, i); 123 + let shift = (start + i) << 2; 124 + let count = ((self.table[index] >> shift) & 0xF) as u8; 125 + frequency = frequency.min(count); 126 + } 127 + frequency 128 + } 129 + 130 + /// Take a hash value of an element and increments the popularity of the 131 + /// element if it does not exceed the maximum (15). The popularity of all 132 + /// elements will be periodically down sampled when the observed events 133 + /// exceeds a threshold. This process provides a frequency aging to allow 134 + /// expired long term entries to fade away. 135 + pub(crate) fn increment(&mut self, hash: u64) { 136 + if self.table.is_empty() { 137 + return; 138 + } 139 + 140 + let start = ((hash & 3) << 2) as u8; 141 + let mut added = false; 142 + for i in 0..4 { 143 + let index = self.index_of(hash, i); 144 + added |= self.increment_at(index, start + i); 145 + } 146 + 147 + if added { 148 + self.size += 1; 149 + if self.size >= self.sample_size { 150 + self.reset(); 151 + } 152 + } 153 + } 154 + 155 + /// Takes a table index (each entry has 16 counters) and counter index, and 156 + /// increments the counter by 1 if it is not already at the maximum value 157 + /// (15). Returns `true` if incremented. 158 + fn increment_at(&mut self, table_index: usize, counter_index: u8) -> bool { 159 + let offset = (counter_index as usize) << 2; 160 + let mask = 0xF_u64 << offset; 161 + if self.table[table_index] & mask != mask { 162 + self.table[table_index] += 1u64 << offset; 163 + true 164 + } else { 165 + false 166 + } 167 + } 168 + 169 + /// Reduces every counter by half of its original value. 170 + fn reset(&mut self) { 171 + let mut count = 0u32; 172 + for entry in self.table.iter_mut() { 173 + // Count number of odd numbers. 174 + count += (*entry & ONE_MASK).count_ones(); 175 + *entry = (*entry >> 1) & RESET_MASK; 176 + } 177 + self.size = (self.size >> 1) - (count >> 2); 178 + } 179 + 180 + /// Returns the table index for the counter at the specified depth. 181 + fn index_of(&self, hash: u64, depth: u8) -> usize { 182 + let i = depth as usize; 183 + let mut hash = hash.wrapping_add(SEED[i]).wrapping_mul(SEED[i]); 184 + hash = hash.wrapping_add(hash >> 32); 185 + (hash & (self.table_mask as u64)) as usize 186 + } 187 + } 188 + 189 + // Methods only available for testing. 190 + #[cfg(test)] 191 + impl FrequencySketch { 192 + pub(crate) fn table_len(&self) -> usize { 193 + self.table.len() 194 + } 195 + } 196 + 197 + // Some test cases were ported from Caffeine at: 198 + // https://github.com/ben-manes/caffeine/blob/master/caffeine/src/test/java/com/github/benmanes/caffeine/cache/FrequencySketchTest.java 199 + // 200 + // To see the debug prints, run test as `cargo test -- --nocapture` 201 + #[cfg(test)] 202 + mod tests { 203 + use super::FrequencySketch; 204 + use once_cell::sync::Lazy; 205 + use std::hash::{BuildHasher, Hash}; 206 + 207 + static ITEM: Lazy<u32> = Lazy::new(|| { 208 + let mut buf = [0; 4]; 209 + getrandom::getrandom(&mut buf).unwrap(); 210 + unsafe { std::mem::transmute::<[u8; 4], u32>(buf) } 211 + }); 212 + 213 + // This test was ported from Caffeine. 214 + #[test] 215 + fn increment_once() { 216 + let mut sketch = FrequencySketch::default(); 217 + sketch.ensure_capacity(512); 218 + let hasher = hasher(); 219 + let item_hash = hasher(*ITEM); 220 + sketch.increment(item_hash); 221 + assert_eq!(sketch.frequency(item_hash), 1); 222 + } 223 + 224 + // This test was ported from Caffeine. 225 + #[test] 226 + fn increment_max() { 227 + let mut sketch = FrequencySketch::default(); 228 + sketch.ensure_capacity(512); 229 + let hasher = hasher(); 230 + let item_hash = hasher(*ITEM); 231 + for _ in 0..20 { 232 + sketch.increment(item_hash); 233 + } 234 + assert_eq!(sketch.frequency(item_hash), 15); 235 + } 236 + 237 + // This test was ported from Caffeine. 238 + #[test] 239 + fn increment_distinct() { 240 + let mut sketch = FrequencySketch::default(); 241 + sketch.ensure_capacity(512); 242 + let hasher = hasher(); 243 + sketch.increment(hasher(*ITEM)); 244 + sketch.increment(hasher(ITEM.wrapping_add(1))); 245 + assert_eq!(sketch.frequency(hasher(*ITEM)), 1); 246 + assert_eq!(sketch.frequency(hasher(ITEM.wrapping_add(1))), 1); 247 + assert_eq!(sketch.frequency(hasher(ITEM.wrapping_add(2))), 0); 248 + } 249 + 250 + // This test was ported from Caffeine. 251 + #[test] 252 + fn index_of_around_zero() { 253 + let mut sketch = FrequencySketch::default(); 254 + sketch.ensure_capacity(512); 255 + let mut indexes = std::collections::HashSet::new(); 256 + let hashes = [u64::MAX, 0, 1]; 257 + for hash in hashes.iter() { 258 + for depth in 0..4 { 259 + indexes.insert(sketch.index_of(*hash, depth)); 260 + } 261 + } 262 + assert_eq!(indexes.len(), 4 * hashes.len()) 263 + } 264 + 265 + // This test was ported from Caffeine. 266 + #[test] 267 + fn reset() { 268 + let mut reset = false; 269 + let mut sketch = FrequencySketch::default(); 270 + sketch.ensure_capacity(64); 271 + let hasher = hasher(); 272 + 273 + for i in 1..(20 * sketch.table.len() as u32) { 274 + sketch.increment(hasher(i)); 275 + if sketch.size != i { 276 + reset = true; 277 + break; 278 + } 279 + } 280 + 281 + assert!(reset); 282 + assert!(sketch.size <= sketch.sample_size / 2); 283 + } 284 + 285 + // This test was ported from Caffeine. 286 + #[test] 287 + fn heavy_hitters() { 288 + let mut sketch = FrequencySketch::default(); 289 + sketch.ensure_capacity(65_536); 290 + let hasher = hasher(); 291 + 292 + for i in 100..100_000 { 293 + sketch.increment(hasher(i)); 294 + } 295 + 296 + for i in (0..10).step_by(2) { 297 + for _ in 0..i { 298 + sketch.increment(hasher(i)); 299 + } 300 + } 301 + 302 + // A perfect popularity count yields an array [0, 0, 2, 0, 4, 0, 6, 0, 8, 0] 303 + let popularity = (0..10) 304 + .map(|i| sketch.frequency(hasher(i))) 305 + .collect::<Vec<_>>(); 306 + 307 + for (i, freq) in popularity.iter().enumerate() { 308 + match i { 309 + 2 => assert!(freq <= &popularity[4]), 310 + 4 => assert!(freq <= &popularity[6]), 311 + 6 => assert!(freq <= &popularity[8]), 312 + 8 => (), 313 + _ => assert!(freq <= &popularity[2]), 314 + } 315 + } 316 + } 317 + 318 + fn hasher<K: Hash>() -> impl Fn(K) -> u64 { 319 + let build_hasher = std::collections::hash_map::RandomState::default(); 320 + move |key| build_hasher.hash_one(&key) 321 + } 322 + } 323 + 324 + // Verify that some properties hold such as no panic occurs on any possible inputs. 325 + #[cfg(kani)] 326 + mod kani { 327 + use super::FrequencySketch; 328 + 329 + const CAPACITIES: &[u32] = &[ 330 + 0, 331 + 1, 332 + 1024, 333 + 1025, 334 + 2u32.pow(24), 335 + 2u32.pow(24) + 1, 336 + 2u32.pow(30), 337 + 2u32.pow(30) + 1, 338 + u32::MAX, 339 + ]; 340 + 341 + #[kani::proof] 342 + fn verify_ensure_capacity() { 343 + // Check for arbitrary capacities. 344 + let capacity = kani::any(); 345 + let mut sketch = FrequencySketch::default(); 346 + sketch.ensure_capacity(capacity); 347 + } 348 + 349 + #[kani::proof] 350 + fn verify_frequency() { 351 + // Check for some selected capacities. 352 + for capacity in CAPACITIES { 353 + let mut sketch = FrequencySketch::default(); 354 + sketch.ensure_capacity(*capacity); 355 + 356 + // Check for arbitrary hashes. 357 + let hash = kani::any(); 358 + let frequency = sketch.frequency(hash); 359 + assert!(frequency <= 15); 360 + } 361 + } 362 + 363 + #[kani::proof] 364 + fn verify_increment() { 365 + // Only check for small capacities. Because Kani Rust Verifier is a model 366 + // checking tool, it will take much longer time (exponential) to check larger 367 + // capacities here. 368 + for capacity in &[0, 1, 128] { 369 + let mut sketch = FrequencySketch::default(); 370 + sketch.ensure_capacity(*capacity); 371 + 372 + // Check for arbitrary hashes. 373 + let hash = kani::any(); 374 + sketch.increment(hash); 375 + } 376 + } 377 + 378 + #[kani::proof] 379 + fn verify_index_of() { 380 + // Check for arbitrary capacities. 381 + let capacity = kani::any(); 382 + let mut sketch = FrequencySketch::default(); 383 + sketch.ensure_capacity(capacity); 384 + 385 + // Check for arbitrary hashes. 386 + let hash = kani::any(); 387 + for i in 0..4 { 388 + let index = sketch.index_of(hash, i); 389 + assert!(index < sketch.table.len()); 390 + } 391 + } 392 + }

+32

crates/mini-moka-vendored/src/common/time.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use std::time::Duration; 2 + 3 + pub(crate) mod clock; 4 + 5 + pub(crate) use clock::Clock; 6 + 7 + /// a wrapper type over Instant to force checked additions and prevent 8 + /// unintentional overflow. The type preserve the Copy semantics for the wrapped 9 + #[derive(PartialEq, PartialOrd, Clone, Copy)] 10 + pub(crate) struct Instant(clock::Instant); 11 + 12 + pub(crate) trait CheckedTimeOps { 13 + fn checked_add(&self, duration: Duration) -> Option<Self> 14 + where 15 + Self: Sized; 16 + } 17 + 18 + impl Instant { 19 + pub(crate) fn new(instant: clock::Instant) -> Instant { 20 + Instant(instant) 21 + } 22 + 23 + pub(crate) fn now() -> Instant { 24 + Instant(clock::Instant::now()) 25 + } 26 + } 27 + 28 + impl CheckedTimeOps for Instant { 29 + fn checked_add(&self, duration: Duration) -> Option<Instant> { 30 + self.0.checked_add(duration).map(Instant) 31 + } 32 + }

+52

crates/mini-moka-vendored/src/common/time/clock.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use std::sync::{Arc, RwLock}; 2 + 3 + #[cfg(test)] 4 + use std::time::Duration; 5 + 6 + #[cfg(not(feature = "js"))] 7 + pub(crate) type Instant = std::time::Instant; 8 + 9 + #[cfg(feature = "js")] 10 + pub(crate) type Instant = web_time::Instant; 11 + 12 + pub(crate) struct Clock { 13 + mock: Option<Arc<Mock>>, 14 + } 15 + 16 + impl Clock { 17 + #[cfg(test)] 18 + pub(crate) fn mock() -> (Clock, Arc<Mock>) { 19 + let mock = Arc::new(Mock::default()); 20 + let clock = Clock { 21 + mock: Some(Arc::clone(&mock)), 22 + }; 23 + (clock, mock) 24 + } 25 + 26 + pub(crate) fn now(&self) -> Instant { 27 + if let Some(mock) = &self.mock { 28 + *mock.now.read().expect("lock poisoned") 29 + } else { 30 + Instant::now() 31 + } 32 + } 33 + } 34 + 35 + pub(crate) struct Mock { 36 + now: RwLock<Instant>, 37 + } 38 + 39 + impl Default for Mock { 40 + fn default() -> Self { 41 + Self { 42 + now: RwLock::new(Instant::now()), 43 + } 44 + } 45 + } 46 + 47 + #[cfg(test)] 48 + impl Mock { 49 + pub(crate) fn increment(&self, amount: Duration) { 50 + *self.now.write().expect("lock poisoned") += amount; 51 + } 52 + }

+86

crates/mini-moka-vendored/src/lib.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + #![warn(clippy::all)] 2 + #![warn(rust_2018_idioms)] 3 + #![deny(rustdoc::broken_intra_doc_links)] 4 + #![cfg_attr(docsrs, feature(doc_cfg))] 5 + 6 + //! Mini Moka is a fast, concurrent cache library for Rust. Mini Moka is a light 7 + //! edition of [Moka][moka-git]. 8 + //! 9 + //! Mini Moka provides an in-memory concurrent cache implementation on top of hash 10 + //! map. It supports high expected concurrency of retrievals and updates. 11 + //! 12 + //! Mini Moka also provides an in-memory, non-thread-safe cache implementation for 13 + //! single thread applications. 14 + //! 15 + //! All cache implementations perform a best-effort bounding of the map using an 16 + //! entry replacement algorithm to determine which entries to evict when the capacity 17 + //! is exceeded. 18 + //! 19 + //! [moka-git]: https://github.com/moka-rs/moka 20 + //! [caffeine-git]: https://github.com/ben-manes/caffeine 21 + //! 22 + //! # Features 23 + //! 24 + //! - A thread-safe, highly concurrent in-memory cache implementation. 25 + //! - A cache can be bounded by one of the followings: 26 + //! - The maximum number of entries. 27 + //! - The total weighted size of entries. (Size aware eviction) 28 + //! - Maintains good hit rate by using entry replacement algorithms inspired by 29 + //! [Caffeine][caffeine-git]: 30 + //! - Admission to a cache is controlled by the Least Frequently Used (LFU) policy. 31 + //! - Eviction from a cache is controlled by the Least Recently Used (LRU) policy. 32 + //! - Supports expiration policies: 33 + //! - Time to live 34 + //! - Time to idle 35 + //! 36 + //! # Examples 37 + //! 38 + //! See the following document: 39 + //! 40 + //! - A thread-safe, synchronous cache: 41 + //! - [`sync::Cache`][sync-cache-struct] 42 + //! - A not thread-safe, blocking cache for single threaded applications: 43 + //! - [`unsync::Cache`][unsync-cache-struct] 44 + //! 45 + //! [sync-cache-struct]: ./sync/struct.Cache.html 46 + //! [unsync-cache-struct]: ./unsync/struct.Cache.html 47 + //! 48 + //! # Minimum Supported Rust Versions 49 + //! 50 + //! This crate's minimum supported Rust versions (MSRV) are the followings: 51 + //! 52 + //! | Feature | MSRV | 53 + //! |:-----------------|:--------------------------:| 54 + //! | default features | Rust 1.76.0 (Feb 8, 2024) | 55 + //! 56 + //! If only the default features are enabled, MSRV will be updated conservatively. 57 + //! When using other features, MSRV might be updated more frequently, up to the 58 + //! latest stable. In both cases, increasing MSRV is _not_ considered a 59 + //! semver-breaking change. 60 + 61 + pub(crate) mod common; 62 + pub(crate) mod policy; 63 + pub mod unsync; 64 + 65 + #[cfg(feature = "sync")] 66 + #[cfg_attr(docsrs, doc(cfg(feature = "sync")))] 67 + pub mod sync; 68 + 69 + pub use policy::Policy; 70 + 71 + #[cfg(test)] 72 + mod tests { 73 + #[cfg(all(trybuild, feature = "sync"))] 74 + #[test] 75 + fn trybuild_sync() { 76 + let t = trybuild::TestCases::new(); 77 + t.compile_fail("tests/compile_tests/sync/clone/*.rs"); 78 + } 79 + } 80 + 81 + #[cfg(all(doctest, feature = "sync"))] 82 + mod doctests { 83 + // https://doc.rust-lang.org/rustdoc/write-documentation/documentation-tests.html#include-items-only-when-collecting-doctests 84 + #[doc = include_str!("../README.md")] 85 + struct ReadMeDoctests; 86 + }

+38

crates/mini-moka-vendored/src/policy.rs

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··· 1 + use std::time::Duration; 2 + 3 + #[derive(Clone, Debug)] 4 + /// The policy of a cache. 5 + pub struct Policy { 6 + max_capacity: Option<u64>, 7 + time_to_live: Option<Duration>, 8 + time_to_idle: Option<Duration>, 9 + } 10 + 11 + impl Policy { 12 + pub(crate) fn new( 13 + max_capacity: Option<u64>, 14 + time_to_live: Option<Duration>, 15 + time_to_idle: Option<Duration>, 16 + ) -> Self { 17 + Self { 18 + max_capacity, 19 + time_to_live, 20 + time_to_idle, 21 + } 22 + } 23 + 24 + /// Returns the `max_capacity` of the cache. 25 + pub fn max_capacity(&self) -> Option<u64> { 26 + self.max_capacity 27 + } 28 + 29 + /// Returns the `time_to_live` of the cache. 30 + pub fn time_to_live(&self) -> Option<Duration> { 31 + self.time_to_live 32 + } 33 + 34 + /// Returns the `time_to_idle` of the cache. 35 + pub fn time_to_idle(&self) -> Option<Duration> { 36 + self.time_to_idle 37 + } 38 + }

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crates/mini-moka-vendored/src/sync.rs

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··· 1 + //! Provides a thread-safe, concurrent cache implementation built upon 2 + //! [`dashmap::DashMap`][dashmap]. 3 + //! 4 + //! [dashmap]: https://docs.rs/dashmap/*/dashmap/struct.DashMap.html 5 + 6 + mod base_cache; 7 + mod builder; 8 + mod cache; 9 + mod iter; 10 + mod mapref; 11 + 12 + pub use builder::CacheBuilder; 13 + pub use cache::Cache; 14 + pub use iter::Iter; 15 + pub use mapref::EntryRef; 16 + 17 + /// Provides extra methods that will be useful for testing. 18 + pub trait ConcurrentCacheExt<K, V> { 19 + /// Performs any pending maintenance operations needed by the cache. 20 + fn sync(&self); 21 + }

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crates/mini-moka-vendored/src/sync/base_cache.rs

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··· 1 + use super::{iter::DashMapIter, Iter}; 2 + use crate::{ 3 + common::{ 4 + self, 5 + concurrent::{ 6 + atomic_time::AtomicInstant, 7 + constants::{ 8 + READ_LOG_FLUSH_POINT, READ_LOG_SIZE, WRITE_LOG_FLUSH_POINT, WRITE_LOG_SIZE, 9 + }, 10 + deques::Deques, 11 + entry_info::EntryInfo, 12 + housekeeper::{Housekeeper, InnerSync}, 13 + AccessTime, KeyDate, KeyHash, KeyHashDate, KvEntry, ReadOp, ValueEntry, Weigher, 14 + WriteOp, 15 + }, 16 + deque::{DeqNode, Deque}, 17 + frequency_sketch::FrequencySketch, 18 + time::{CheckedTimeOps, Clock, Instant}, 19 + CacheRegion, 20 + }, 21 + Policy, 22 + }; 23 + 24 + use crossbeam_channel::{Receiver, Sender, TrySendError}; 25 + use crossbeam_utils::atomic::AtomicCell; 26 + use dashmap::mapref::one::Ref as DashMapRef; 27 + use smallvec::SmallVec; 28 + use std::{ 29 + borrow::Borrow, 30 + collections::hash_map::RandomState, 31 + hash::{BuildHasher, Hash}, 32 + ptr::NonNull, 33 + sync::{ 34 + atomic::{AtomicBool, Ordering}, 35 + Arc, Mutex, RwLock, 36 + }, 37 + time::Duration, 38 + }; 39 + use triomphe::Arc as TrioArc; 40 + 41 + pub(crate) struct BaseCache<K, V, S = RandomState> { 42 + pub(crate) inner: Arc<Inner<K, V, S>>, 43 + read_op_ch: Sender<ReadOp<K, V>>, 44 + pub(crate) write_op_ch: Sender<WriteOp<K, V>>, 45 + pub(crate) housekeeper: Option<Arc<Housekeeper>>, 46 + } 47 + 48 + impl<K, V, S> Clone for BaseCache<K, V, S> { 49 + /// Makes a clone of this shared cache. 50 + /// 51 + /// This operation is cheap as it only creates thread-safe reference counted 52 + /// pointers to the shared internal data structures. 53 + fn clone(&self) -> Self { 54 + Self { 55 + inner: Arc::clone(&self.inner), 56 + read_op_ch: self.read_op_ch.clone(), 57 + write_op_ch: self.write_op_ch.clone(), 58 + housekeeper: self.housekeeper.clone(), 59 + } 60 + } 61 + } 62 + 63 + impl<K, V, S> Drop for BaseCache<K, V, S> { 64 + fn drop(&mut self) { 65 + // The housekeeper needs to be dropped before the inner is dropped. 66 + std::mem::drop(self.housekeeper.take()); 67 + } 68 + } 69 + 70 + impl<K, V, S> BaseCache<K, V, S> { 71 + pub(crate) fn policy(&self) -> Policy { 72 + self.inner.policy() 73 + } 74 + 75 + pub(crate) fn entry_count(&self) -> u64 { 76 + self.inner.entry_count() 77 + } 78 + 79 + pub(crate) fn weighted_size(&self) -> u64 { 80 + self.inner.weighted_size() 81 + } 82 + } 83 + 84 + impl<K, V, S> BaseCache<K, V, S> 85 + where 86 + K: Hash + Eq + Send + Sync + 'static, 87 + V: Clone + Send + Sync + 'static, 88 + S: BuildHasher + Clone + Send + Sync + 'static, 89 + { 90 + pub(crate) fn new( 91 + max_capacity: Option<u64>, 92 + initial_capacity: Option<usize>, 93 + build_hasher: S, 94 + weigher: Option<Weigher<K, V>>, 95 + time_to_live: Option<Duration>, 96 + time_to_idle: Option<Duration>, 97 + ) -> Self { 98 + let (r_snd, r_rcv) = crossbeam_channel::bounded(READ_LOG_SIZE); 99 + let (w_snd, w_rcv) = crossbeam_channel::bounded(WRITE_LOG_SIZE); 100 + 101 + let inner = Inner::new( 102 + max_capacity, 103 + initial_capacity, 104 + build_hasher, 105 + weigher, 106 + r_rcv, 107 + w_rcv, 108 + time_to_live, 109 + time_to_idle, 110 + ); 111 + Self { 112 + #[cfg_attr(beta_clippy, allow(clippy::arc_with_non_send_sync))] 113 + inner: Arc::new(inner), 114 + read_op_ch: r_snd, 115 + write_op_ch: w_snd, 116 + housekeeper: Some(Arc::new(Housekeeper::default())), 117 + } 118 + } 119 + 120 + #[inline] 121 + pub(crate) fn hash<Q>(&self, key: &Q) -> u64 122 + where 123 + Arc<K>: Borrow<Q>, 124 + Q: Hash + Eq + ?Sized, 125 + { 126 + self.inner.hash(key) 127 + } 128 + 129 + pub(crate) fn contains_key<Q>(&self, key: &Q) -> bool 130 + where 131 + Arc<K>: Borrow<Q>, 132 + Q: Hash + Eq + ?Sized, 133 + { 134 + match self.inner.get(key) { 135 + None => false, 136 + Some(entry) => { 137 + let i = &self.inner; 138 + let (ttl, tti, va) = (&i.time_to_live(), &i.time_to_idle(), &i.valid_after()); 139 + let now = i.current_time_from_expiration_clock(); 140 + let entry = &*entry; 141 + 142 + !is_expired_entry_wo(ttl, va, entry, now) 143 + && !is_expired_entry_ao(tti, va, entry, now) 144 + } 145 + } 146 + } 147 + 148 + pub(crate) fn get_with_hash<Q>(&self, key: &Q, hash: u64) -> Option<V> 149 + where 150 + Arc<K>: Borrow<Q>, 151 + Q: Hash + Eq + ?Sized, 152 + { 153 + let record = |op, now| { 154 + self.record_read_op(op, now) 155 + .expect("Failed to record a get op"); 156 + }; 157 + let now = self.inner.current_time_from_expiration_clock(); 158 + 159 + match self.inner.get(key) { 160 + None => { 161 + record(ReadOp::Miss(hash), now); 162 + None 163 + } 164 + Some(entry) => { 165 + let i = &self.inner; 166 + let (ttl, tti, va) = (&i.time_to_live(), &i.time_to_idle(), &i.valid_after()); 167 + let arc_entry = &*entry; 168 + 169 + if is_expired_entry_wo(ttl, va, arc_entry, now) 170 + || is_expired_entry_ao(tti, va, arc_entry, now) 171 + { 172 + // Drop the entry to avoid to deadlock with record_read_op. 173 + std::mem::drop(entry); 174 + // Expired or invalidated entry. Record this access as a cache miss 175 + // rather than a hit. 176 + record(ReadOp::Miss(hash), now); 177 + None 178 + } else { 179 + // Valid entry. 180 + let v = arc_entry.value.clone(); 181 + let e = TrioArc::clone(arc_entry); 182 + // Drop the entry to avoid to deadlock with record_read_op. 183 + std::mem::drop(entry); 184 + record(ReadOp::Hit(hash, e, now), now); 185 + Some(v) 186 + } 187 + } 188 + } 189 + } 190 + 191 + #[inline] 192 + pub(crate) fn remove_entry<Q>(&self, key: &Q) -> Option<KvEntry<K, V>> 193 + where 194 + Arc<K>: Borrow<Q>, 195 + Q: Hash + Eq + ?Sized, 196 + { 197 + self.inner.remove_entry(key) 198 + } 199 + 200 + #[inline] 201 + pub(crate) fn apply_reads_writes_if_needed( 202 + inner: &impl InnerSync, 203 + ch: &Sender<WriteOp<K, V>>, 204 + now: Instant, 205 + housekeeper: Option<&Arc<Housekeeper>>, 206 + ) { 207 + let w_len = ch.len(); 208 + 209 + if let Some(hk) = housekeeper { 210 + if hk.should_apply_writes(w_len, now) { 211 + hk.try_sync(inner); 212 + } 213 + } 214 + } 215 + 216 + pub(crate) fn invalidate_all(&self) { 217 + let now = self.inner.current_time_from_expiration_clock(); 218 + self.inner.set_valid_after(now); 219 + } 220 + } 221 + 222 + // Clippy beta 0.1.83 (f41c7ed9889 2024-10-31) warns about unused lifetimes on 'a. 223 + // This seems a false positive. The lifetimes are used in the trait bounds. 224 + // https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes 225 + #[allow(clippy::extra_unused_lifetimes)] 226 + impl<'a, K, V, S> BaseCache<K, V, S> 227 + where 228 + K: 'a + Eq + Hash, 229 + V: 'a, 230 + S: BuildHasher + Clone, 231 + { 232 + pub(crate) fn iter(&self) -> Iter<'_, K, V, S> { 233 + Iter::new(self, self.inner.iter()) 234 + } 235 + } 236 + 237 + impl<K, V, S> BaseCache<K, V, S> { 238 + pub(crate) fn is_expired_entry(&self, entry: &TrioArc<ValueEntry<K, V>>) -> bool { 239 + let i = &self.inner; 240 + let (ttl, tti, va) = (&i.time_to_live(), &i.time_to_idle(), &i.valid_after()); 241 + let now = i.current_time_from_expiration_clock(); 242 + 243 + is_expired_entry_wo(ttl, va, entry, now) || is_expired_entry_ao(tti, va, entry, now) 244 + } 245 + } 246 + 247 + // 248 + // private methods 249 + // 250 + impl<K, V, S> BaseCache<K, V, S> 251 + where 252 + K: Hash + Eq + Send + Sync + 'static, 253 + V: Clone + Send + Sync + 'static, 254 + S: BuildHasher + Clone + Send + Sync + 'static, 255 + { 256 + #[inline] 257 + fn record_read_op( 258 + &self, 259 + op: ReadOp<K, V>, 260 + now: Instant, 261 + ) -> Result<(), TrySendError<ReadOp<K, V>>> { 262 + self.apply_reads_if_needed(self.inner.as_ref(), now); 263 + let ch = &self.read_op_ch; 264 + match ch.try_send(op) { 265 + // Discard the ReadOp when the channel is full. 266 + Ok(()) | Err(TrySendError::Full(_)) => Ok(()), 267 + Err(e @ TrySendError::Disconnected(_)) => Err(e), 268 + } 269 + } 270 + 271 + #[inline] 272 + pub(crate) fn do_insert_with_hash( 273 + &self, 274 + key: Arc<K>, 275 + hash: u64, 276 + value: V, 277 + ) -> (WriteOp<K, V>, Instant) { 278 + let ts = self.inner.current_time_from_expiration_clock(); 279 + let weight = self.inner.weigh(&key, &value); 280 + let mut insert_op = None; 281 + let mut update_op = None; 282 + 283 + self.inner 284 + .cache 285 + .entry(Arc::clone(&key)) 286 + // Update 287 + .and_modify(|entry| { 288 + // NOTES on `new_value_entry_from` method: 289 + // 1. The internal EntryInfo will be shared between the old and new 290 + // ValueEntries. 291 + // 2. This method will set the dirty flag to prevent this new 292 + // ValueEntry from being evicted by an expiration policy. 293 + // 3. This method will update the policy_weight with the new weight. 294 + let old_weight = entry.policy_weight(); 295 + *entry = self.new_value_entry_from(value.clone(), ts, weight, entry); 296 + update_op = Some(WriteOp::Upsert { 297 + key_hash: KeyHash::new(Arc::clone(&key), hash), 298 + value_entry: TrioArc::clone(entry), 299 + old_weight, 300 + new_weight: weight, 301 + }); 302 + }) 303 + // Insert 304 + .or_insert_with(|| { 305 + let entry = self.new_value_entry(value.clone(), ts, weight); 306 + insert_op = Some(WriteOp::Upsert { 307 + key_hash: KeyHash::new(Arc::clone(&key), hash), 308 + value_entry: TrioArc::clone(&entry), 309 + old_weight: 0, 310 + new_weight: weight, 311 + }); 312 + entry 313 + }); 314 + 315 + match (insert_op, update_op) { 316 + (Some(ins_op), None) => (ins_op, ts), 317 + (None, Some(upd_op)) => (upd_op, ts), 318 + _ => unreachable!(), 319 + } 320 + } 321 + 322 + #[inline] 323 + fn new_value_entry( 324 + &self, 325 + value: V, 326 + timestamp: Instant, 327 + policy_weight: u32, 328 + ) -> TrioArc<ValueEntry<K, V>> { 329 + let info = TrioArc::new(EntryInfo::new(timestamp, policy_weight)); 330 + TrioArc::new(ValueEntry::new(value, info)) 331 + } 332 + 333 + #[inline] 334 + fn new_value_entry_from( 335 + &self, 336 + value: V, 337 + timestamp: Instant, 338 + policy_weight: u32, 339 + other: &ValueEntry<K, V>, 340 + ) -> TrioArc<ValueEntry<K, V>> { 341 + let info = TrioArc::clone(other.entry_info()); 342 + // To prevent this updated ValueEntry from being evicted by an expiration policy, 343 + // set the dirty flag to true. It will be reset to false when the write is applied. 344 + info.set_dirty(true); 345 + info.set_last_accessed(timestamp); 346 + info.set_last_modified(timestamp); 347 + info.set_policy_weight(policy_weight); 348 + TrioArc::new(ValueEntry::new(value, info)) 349 + } 350 + 351 + #[inline] 352 + fn apply_reads_if_needed(&self, inner: &impl InnerSync, now: Instant) { 353 + let len = self.read_op_ch.len(); 354 + 355 + if let Some(hk) = &self.housekeeper { 356 + if hk.should_apply_reads(len, now) { 357 + if let Some(h) = &self.housekeeper { 358 + h.try_sync(inner); 359 + } 360 + } 361 + } 362 + } 363 + 364 + #[inline] 365 + pub(crate) fn current_time_from_expiration_clock(&self) -> Instant { 366 + self.inner.current_time_from_expiration_clock() 367 + } 368 + } 369 + 370 + // 371 + // for testing 372 + // 373 + #[cfg(test)] 374 + impl<K, V, S> BaseCache<K, V, S> 375 + where 376 + K: Hash + Eq + Send + Sync + 'static, 377 + V: Clone + Send + Sync + 'static, 378 + S: BuildHasher + Clone + Send + Sync + 'static, 379 + { 380 + pub(crate) fn reconfigure_for_testing(&mut self) { 381 + // Enable the frequency sketch. 382 + self.inner.enable_frequency_sketch_for_testing(); 383 + } 384 + 385 + pub(crate) fn set_expiration_clock(&self, clock: Option<Clock>) { 386 + self.inner.set_expiration_clock(clock); 387 + } 388 + } 389 + 390 + struct EvictionCounters { 391 + entry_count: u64, 392 + weighted_size: u64, 393 + } 394 + 395 + impl EvictionCounters { 396 + #[inline] 397 + fn new(entry_count: u64, weighted_size: u64) -> Self { 398 + Self { 399 + entry_count, 400 + weighted_size, 401 + } 402 + } 403 + 404 + #[inline] 405 + fn saturating_add(&mut self, entry_count: u64, weight: u32) { 406 + self.entry_count += entry_count; 407 + let total = &mut self.weighted_size; 408 + *total = total.saturating_add(weight as u64); 409 + } 410 + 411 + #[inline] 412 + fn saturating_sub(&mut self, entry_count: u64, weight: u32) { 413 + self.entry_count -= entry_count; 414 + let total = &mut self.weighted_size; 415 + *total = total.saturating_sub(weight as u64); 416 + } 417 + } 418 + 419 + #[derive(Default)] 420 + struct EntrySizeAndFrequency { 421 + policy_weight: u64, 422 + freq: u32, 423 + } 424 + 425 + impl EntrySizeAndFrequency { 426 + fn new(policy_weight: u32) -> Self { 427 + Self { 428 + policy_weight: policy_weight as u64, 429 + ..Default::default() 430 + } 431 + } 432 + 433 + fn add_policy_weight(&mut self, weight: u32) { 434 + self.policy_weight += weight as u64; 435 + } 436 + 437 + fn add_frequency(&mut self, freq: &FrequencySketch, hash: u64) { 438 + self.freq += freq.frequency(hash) as u32; 439 + } 440 + } 441 + 442 + // Access-Order Queue Node 443 + type AoqNode<K> = NonNull<DeqNode<KeyHashDate<K>>>; 444 + 445 + enum AdmissionResult<K> { 446 + Admitted { 447 + victim_nodes: SmallVec<[AoqNode<K>; 8]>, 448 + skipped_nodes: SmallVec<[AoqNode<K>; 4]>, 449 + }, 450 + Rejected { 451 + skipped_nodes: SmallVec<[AoqNode<K>; 4]>, 452 + }, 453 + } 454 + 455 + type CacheStore<K, V, S> = dashmap::DashMap<Arc<K>, TrioArc<ValueEntry<K, V>>, S>; 456 + 457 + type CacheEntryRef<'a, K, V> = DashMapRef<'a, Arc<K>, TrioArc<ValueEntry<K, V>>>; 458 + 459 + pub(crate) struct Inner<K, V, S> { 460 + max_capacity: Option<u64>, 461 + entry_count: AtomicCell<u64>, 462 + weighted_size: AtomicCell<u64>, 463 + cache: CacheStore<K, V, S>, 464 + build_hasher: S, 465 + deques: Mutex<Deques<K>>, 466 + frequency_sketch: RwLock<FrequencySketch>, 467 + frequency_sketch_enabled: AtomicBool, 468 + read_op_ch: Receiver<ReadOp<K, V>>, 469 + write_op_ch: Receiver<WriteOp<K, V>>, 470 + time_to_live: Option<Duration>, 471 + time_to_idle: Option<Duration>, 472 + valid_after: AtomicInstant, 473 + weigher: Option<Weigher<K, V>>, 474 + has_expiration_clock: AtomicBool, 475 + expiration_clock: RwLock<Option<Clock>>, 476 + } 477 + 478 + // functions/methods used by BaseCache 479 + impl<K, V, S> Inner<K, V, S> 480 + where 481 + K: Hash + Eq + Send + Sync + 'static, 482 + V: Send + Sync + 'static, 483 + S: BuildHasher + Clone, 484 + { 485 + // Disable a Clippy warning for having more than seven arguments. 486 + // https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments 487 + #[allow(clippy::too_many_arguments)] 488 + fn new( 489 + max_capacity: Option<u64>, 490 + initial_capacity: Option<usize>, 491 + build_hasher: S, 492 + weigher: Option<Weigher<K, V>>, 493 + read_op_ch: Receiver<ReadOp<K, V>>, 494 + write_op_ch: Receiver<WriteOp<K, V>>, 495 + time_to_live: Option<Duration>, 496 + time_to_idle: Option<Duration>, 497 + ) -> Self { 498 + let initial_capacity = initial_capacity 499 + .map(|cap| cap + WRITE_LOG_SIZE) 500 + .unwrap_or_default(); 501 + let cache = 502 + dashmap::DashMap::with_capacity_and_hasher(initial_capacity, build_hasher.clone()); 503 + 504 + Self { 505 + max_capacity, 506 + entry_count: Default::default(), 507 + weighted_size: Default::default(), 508 + cache, 509 + build_hasher, 510 + deques: Mutex::new(Default::default()), 511 + frequency_sketch: RwLock::new(Default::default()), 512 + frequency_sketch_enabled: Default::default(), 513 + read_op_ch, 514 + write_op_ch, 515 + time_to_live, 516 + time_to_idle, 517 + valid_after: Default::default(), 518 + weigher, 519 + has_expiration_clock: AtomicBool::new(false), 520 + expiration_clock: RwLock::new(None), 521 + } 522 + } 523 + 524 + #[inline] 525 + fn hash<Q>(&self, key: &Q) -> u64 526 + where 527 + Arc<K>: Borrow<Q>, 528 + Q: Hash + Eq + ?Sized, 529 + { 530 + self.build_hasher.hash_one(key) 531 + } 532 + 533 + #[inline] 534 + fn get<Q>(&self, key: &Q) -> Option<CacheEntryRef<'_, K, V>> 535 + where 536 + Arc<K>: Borrow<Q>, 537 + Q: Hash + Eq + ?Sized, 538 + { 539 + self.cache.get(key) 540 + } 541 + 542 + #[inline] 543 + fn remove_entry<Q>(&self, key: &Q) -> Option<KvEntry<K, V>> 544 + where 545 + Arc<K>: Borrow<Q>, 546 + Q: Hash + Eq + ?Sized, 547 + { 548 + self.cache 549 + .remove(key) 550 + .map(|(key, entry)| KvEntry::new(key, entry)) 551 + } 552 + } 553 + 554 + // functions/methods used by BaseCache 555 + impl<K, V, S> Inner<K, V, S> { 556 + fn policy(&self) -> Policy { 557 + Policy::new(self.max_capacity, self.time_to_live, self.time_to_idle) 558 + } 559 + 560 + #[inline] 561 + fn time_to_live(&self) -> Option<Duration> { 562 + self.time_to_live 563 + } 564 + 565 + #[inline] 566 + fn time_to_idle(&self) -> Option<Duration> { 567 + self.time_to_idle 568 + } 569 + 570 + #[inline] 571 + fn entry_count(&self) -> u64 { 572 + self.entry_count.load() 573 + } 574 + 575 + #[inline] 576 + pub(crate) fn weighted_size(&self) -> u64 { 577 + self.weighted_size.load() 578 + } 579 + 580 + #[inline] 581 + fn has_expiry(&self) -> bool { 582 + self.time_to_live.is_some() || self.time_to_idle.is_some() 583 + } 584 + 585 + #[inline] 586 + fn is_write_order_queue_enabled(&self) -> bool { 587 + self.time_to_live.is_some() 588 + } 589 + 590 + #[inline] 591 + fn valid_after(&self) -> Option<Instant> { 592 + self.valid_after.instant() 593 + } 594 + 595 + #[inline] 596 + fn set_valid_after(&self, timestamp: Instant) { 597 + self.valid_after.set_instant(timestamp); 598 + } 599 + 600 + #[inline] 601 + fn has_valid_after(&self) -> bool { 602 + self.valid_after.is_set() 603 + } 604 + 605 + #[inline] 606 + fn weigh(&self, key: &K, value: &V) -> u32 { 607 + self.weigher.as_ref().map(|w| w(key, value)).unwrap_or(1) 608 + } 609 + 610 + #[inline] 611 + fn current_time_from_expiration_clock(&self) -> Instant { 612 + if self.has_expiration_clock.load(Ordering::Relaxed) { 613 + Instant::new( 614 + self.expiration_clock 615 + .read() 616 + .expect("lock poisoned") 617 + .as_ref() 618 + .expect("Cannot get the expiration clock") 619 + .now(), 620 + ) 621 + } else { 622 + Instant::now() 623 + } 624 + } 625 + } 626 + 627 + // Clippy beta 0.1.83 (f41c7ed9889 2024-10-31) warns about unused lifetimes on 'a. 628 + // This seems a false positive. The lifetimes are used in the trait bounds. 629 + // https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes 630 + #[allow(clippy::extra_unused_lifetimes)] 631 + impl<'a, K, V, S> Inner<K, V, S> 632 + where 633 + K: 'a + Eq + Hash, 634 + V: 'a, 635 + S: BuildHasher + Clone, 636 + { 637 + fn iter(&self) -> DashMapIter<'_, K, V, S> { 638 + self.cache.iter() 639 + } 640 + } 641 + 642 + mod batch_size { 643 + pub(crate) const EVICTION_BATCH_SIZE: usize = 500; 644 + } 645 + 646 + // TODO: Divide this method into smaller methods so that unit tests can do more 647 + // precise testing. 648 + // - sync_reads 649 + // - sync_writes 650 + // - evict 651 + // - invalidate_entries 652 + impl<K, V, S> InnerSync for Inner<K, V, S> 653 + where 654 + K: Hash + Eq + Send + Sync + 'static, 655 + V: Send + Sync + 'static, 656 + S: BuildHasher + Clone + Send + Sync + 'static, 657 + { 658 + fn sync(&self, max_repeats: usize) { 659 + let mut deqs = self.deques.lock().expect("lock poisoned"); 660 + let mut calls = 0; 661 + let mut should_sync = true; 662 + 663 + let current_ec = self.entry_count.load(); 664 + let current_ws = self.weighted_size.load(); 665 + let mut counters = EvictionCounters::new(current_ec, current_ws); 666 + 667 + while should_sync && calls <= max_repeats { 668 + let r_len = self.read_op_ch.len(); 669 + if r_len > 0 { 670 + self.apply_reads(&mut deqs, r_len); 671 + } 672 + 673 + let w_len = self.write_op_ch.len(); 674 + if w_len > 0 { 675 + self.apply_writes(&mut deqs, w_len, &mut counters); 676 + } 677 + 678 + if self.should_enable_frequency_sketch(&counters) { 679 + self.enable_frequency_sketch(&counters); 680 + } 681 + 682 + calls += 1; 683 + should_sync = self.read_op_ch.len() >= READ_LOG_FLUSH_POINT 684 + || self.write_op_ch.len() >= WRITE_LOG_FLUSH_POINT; 685 + } 686 + 687 + if self.has_expiry() || self.has_valid_after() { 688 + self.evict_expired(&mut deqs, batch_size::EVICTION_BATCH_SIZE, &mut counters); 689 + } 690 + 691 + // Evict if this cache has more entries than its capacity. 692 + let weights_to_evict = self.weights_to_evict(&counters); 693 + if weights_to_evict > 0 { 694 + self.evict_lru_entries( 695 + &mut deqs, 696 + batch_size::EVICTION_BATCH_SIZE, 697 + weights_to_evict, 698 + &mut counters, 699 + ); 700 + } 701 + 702 + debug_assert_eq!(self.entry_count.load(), current_ec); 703 + debug_assert_eq!(self.weighted_size.load(), current_ws); 704 + self.entry_count.store(counters.entry_count); 705 + self.weighted_size.store(counters.weighted_size); 706 + } 707 + 708 + fn now(&self) -> Instant { 709 + self.current_time_from_expiration_clock() 710 + } 711 + } 712 + 713 + // 714 + // private methods 715 + // 716 + impl<K, V, S> Inner<K, V, S> 717 + where 718 + K: Hash + Eq + Send + Sync + 'static, 719 + V: Send + Sync + 'static, 720 + S: BuildHasher + Clone + Send + Sync + 'static, 721 + { 722 + fn has_enough_capacity(&self, candidate_weight: u32, counters: &EvictionCounters) -> bool { 723 + self.max_capacity 724 + .map(|limit| counters.weighted_size + candidate_weight as u64 <= limit) 725 + .unwrap_or(true) 726 + } 727 + 728 + fn weights_to_evict(&self, counters: &EvictionCounters) -> u64 { 729 + self.max_capacity 730 + .map(|limit| counters.weighted_size.saturating_sub(limit)) 731 + .unwrap_or_default() 732 + } 733 + 734 + #[inline] 735 + fn should_enable_frequency_sketch(&self, counters: &EvictionCounters) -> bool { 736 + if self.frequency_sketch_enabled.load(Ordering::Acquire) { 737 + false 738 + } else if let Some(max_cap) = self.max_capacity { 739 + counters.weighted_size >= max_cap / 2 740 + } else { 741 + false 742 + } 743 + } 744 + 745 + #[inline] 746 + fn enable_frequency_sketch(&self, counters: &EvictionCounters) { 747 + if let Some(max_cap) = self.max_capacity { 748 + let c = counters; 749 + let cap = if self.weigher.is_none() { 750 + max_cap 751 + } else { 752 + (c.entry_count as f64 * (c.weighted_size as f64 / max_cap as f64)) as u64 753 + }; 754 + self.do_enable_frequency_sketch(cap); 755 + } 756 + } 757 + 758 + #[cfg(test)] 759 + fn enable_frequency_sketch_for_testing(&self) { 760 + if let Some(max_cap) = self.max_capacity { 761 + self.do_enable_frequency_sketch(max_cap); 762 + } 763 + } 764 + 765 + #[inline] 766 + fn do_enable_frequency_sketch(&self, cache_capacity: u64) { 767 + let skt_capacity = common::sketch_capacity(cache_capacity); 768 + self.frequency_sketch 769 + .write() 770 + .expect("lock poisoned") 771 + .ensure_capacity(skt_capacity); 772 + self.frequency_sketch_enabled.store(true, Ordering::Release); 773 + } 774 + 775 + fn apply_reads(&self, deqs: &mut Deques<K>, count: usize) { 776 + use ReadOp::*; 777 + let mut freq = self.frequency_sketch.write().expect("lock poisoned"); 778 + let ch = &self.read_op_ch; 779 + for _ in 0..count { 780 + match ch.try_recv() { 781 + Ok(Hit(hash, entry, timestamp)) => { 782 + freq.increment(hash); 783 + entry.set_last_accessed(timestamp); 784 + if entry.is_admitted() { 785 + deqs.move_to_back_ao(&entry); 786 + } 787 + } 788 + Ok(Miss(hash)) => freq.increment(hash), 789 + Err(_) => break, 790 + } 791 + } 792 + } 793 + 794 + fn apply_writes(&self, deqs: &mut Deques<K>, count: usize, counters: &mut EvictionCounters) { 795 + use WriteOp::*; 796 + let freq = self.frequency_sketch.read().expect("lock poisoned"); 797 + let ch = &self.write_op_ch; 798 + 799 + for _ in 0..count { 800 + match ch.try_recv() { 801 + Ok(Upsert { 802 + key_hash: kh, 803 + value_entry: entry, 804 + old_weight, 805 + new_weight, 806 + }) => self.handle_upsert(kh, entry, old_weight, new_weight, deqs, &freq, counters), 807 + Ok(Remove(KvEntry { key: _key, entry })) => { 808 + Self::handle_remove(deqs, entry, counters) 809 + } 810 + Err(_) => break, 811 + }; 812 + } 813 + } 814 + 815 + #[allow(clippy::too_many_arguments)] 816 + fn handle_upsert( 817 + &self, 818 + kh: KeyHash<K>, 819 + entry: TrioArc<ValueEntry<K, V>>, 820 + old_weight: u32, 821 + new_weight: u32, 822 + deqs: &mut Deques<K>, 823 + freq: &FrequencySketch, 824 + counters: &mut EvictionCounters, 825 + ) { 826 + entry.set_dirty(false); 827 + 828 + if entry.is_admitted() { 829 + // The entry has been already admitted, so treat this as an update. 830 + counters.saturating_sub(0, old_weight); 831 + counters.saturating_add(0, new_weight); 832 + deqs.move_to_back_ao(&entry); 833 + deqs.move_to_back_wo(&entry); 834 + return; 835 + } 836 + 837 + if self.has_enough_capacity(new_weight, counters) { 838 + // There are enough room in the cache (or the cache is unbounded). 839 + // Add the candidate to the deques. 840 + self.handle_admit(kh, &entry, new_weight, deqs, counters); 841 + return; 842 + } 843 + 844 + if let Some(max) = self.max_capacity { 845 + if new_weight as u64 > max { 846 + // The candidate is too big to fit in the cache. Reject it. 847 + self.cache.remove(&Arc::clone(&kh.key)); 848 + return; 849 + } 850 + } 851 + 852 + let skipped_nodes; 853 + let mut candidate = EntrySizeAndFrequency::new(new_weight); 854 + candidate.add_frequency(freq, kh.hash); 855 + 856 + // Try to admit the candidate. 857 + match Self::admit(&candidate, &self.cache, deqs, freq) { 858 + AdmissionResult::Admitted { 859 + victim_nodes, 860 + skipped_nodes: mut skipped, 861 + } => { 862 + // Try to remove the victims from the cache (hash map). 863 + for victim in victim_nodes { 864 + if let Some((_vic_key, vic_entry)) = 865 + self.cache.remove(unsafe { victim.as_ref().element.key() }) 866 + { 867 + // And then remove the victim from the deques. 868 + Self::handle_remove(deqs, vic_entry, counters); 869 + } else { 870 + // Could not remove the victim from the cache. Skip this 871 + // victim node as its ValueEntry might have been 872 + // invalidated. Add it to the skipped nodes. 873 + skipped.push(victim); 874 + } 875 + } 876 + skipped_nodes = skipped; 877 + 878 + // Add the candidate to the deques. 879 + self.handle_admit(kh, &entry, new_weight, deqs, counters); 880 + } 881 + AdmissionResult::Rejected { skipped_nodes: s } => { 882 + skipped_nodes = s; 883 + // Remove the candidate from the cache (hash map). 884 + self.cache.remove(&Arc::clone(&kh.key)); 885 + } 886 + }; 887 + 888 + // Move the skipped nodes to the back of the deque. We do not unlink (drop) 889 + // them because ValueEntries in the write op queue should be pointing them. 890 + for node in skipped_nodes { 891 + unsafe { deqs.probation.move_to_back(node) }; 892 + } 893 + } 894 + 895 + /// Performs size-aware admission explained in the paper: 896 + /// [Lightweight Robust Size Aware Cache Management][size-aware-cache-paper] 897 + /// by Gil Einziger, Ohad Eytan, Roy Friedman, Ben Manes. 898 + /// 899 + /// [size-aware-cache-paper]: https://arxiv.org/abs/2105.08770 900 + /// 901 + /// There are some modifications in this implementation: 902 + /// - To admit to the main space, candidate's frequency must be higher than 903 + /// the aggregated frequencies of the potential victims. (In the paper, 904 + /// `>=` operator is used rather than `>`) The `>` operator will do a better 905 + /// job to prevent the main space from polluting. 906 + /// - When a candidate is rejected, the potential victims will stay at the LRU 907 + /// position of the probation access-order queue. (In the paper, they will be 908 + /// promoted (to the MRU position?) to force the eviction policy to select a 909 + /// different set of victims for the next candidate). We may implement the 910 + /// paper's behavior later? 911 + /// 912 + #[inline] 913 + fn admit( 914 + candidate: &EntrySizeAndFrequency, 915 + cache: &CacheStore<K, V, S>, 916 + deqs: &Deques<K>, 917 + freq: &FrequencySketch, 918 + ) -> AdmissionResult<K> { 919 + const MAX_CONSECUTIVE_RETRIES: usize = 5; 920 + let mut retries = 0; 921 + 922 + let mut victims = EntrySizeAndFrequency::default(); 923 + let mut victim_nodes = SmallVec::default(); 924 + let mut skipped_nodes = SmallVec::default(); 925 + 926 + // Get first potential victim at the LRU position. 927 + let mut next_victim = deqs.probation.peek_front_ptr(); 928 + 929 + // Aggregate potential victims. 930 + while victims.policy_weight < candidate.policy_weight { 931 + if candidate.freq < victims.freq { 932 + break; 933 + } 934 + if let Some(victim) = next_victim.take() { 935 + next_victim = DeqNode::next_node_ptr(victim); 936 + let vic_elem = &unsafe { victim.as_ref() }.element; 937 + 938 + if let Some(vic_entry) = cache.get(vic_elem.key()) { 939 + victims.add_policy_weight(vic_entry.policy_weight()); 940 + victims.add_frequency(freq, vic_elem.hash()); 941 + victim_nodes.push(victim); 942 + retries = 0; 943 + } else { 944 + // Could not get the victim from the cache (hash map). Skip this node 945 + // as its ValueEntry might have been invalidated. 946 + skipped_nodes.push(victim); 947 + 948 + retries += 1; 949 + if retries > MAX_CONSECUTIVE_RETRIES { 950 + break; 951 + } 952 + } 953 + } else { 954 + // No more potential victims. 955 + break; 956 + } 957 + } 958 + 959 + // Admit or reject the candidate. 960 + 961 + // TODO: Implement some randomness to mitigate hash DoS attack. 962 + // See Caffeine's implementation. 963 + 964 + if victims.policy_weight >= candidate.policy_weight && candidate.freq > victims.freq { 965 + AdmissionResult::Admitted { 966 + victim_nodes, 967 + skipped_nodes, 968 + } 969 + } else { 970 + AdmissionResult::Rejected { skipped_nodes } 971 + } 972 + } 973 + 974 + fn handle_admit( 975 + &self, 976 + kh: KeyHash<K>, 977 + entry: &TrioArc<ValueEntry<K, V>>, 978 + policy_weight: u32, 979 + deqs: &mut Deques<K>, 980 + counters: &mut EvictionCounters, 981 + ) { 982 + let key = Arc::clone(&kh.key); 983 + counters.saturating_add(1, policy_weight); 984 + deqs.push_back_ao( 985 + CacheRegion::MainProbation, 986 + KeyHashDate::new(kh, entry.entry_info()), 987 + entry, 988 + ); 989 + if self.is_write_order_queue_enabled() { 990 + deqs.push_back_wo(KeyDate::new(key, entry.entry_info()), entry); 991 + } 992 + entry.set_admitted(true); 993 + } 994 + 995 + fn handle_remove( 996 + deqs: &mut Deques<K>, 997 + entry: TrioArc<ValueEntry<K, V>>, 998 + counters: &mut EvictionCounters, 999 + ) { 1000 + if entry.is_admitted() { 1001 + entry.set_admitted(false); 1002 + counters.saturating_sub(1, entry.policy_weight()); 1003 + // The following two unlink_* functions will unset the deq nodes. 1004 + deqs.unlink_ao(&entry); 1005 + Deques::unlink_wo(&mut deqs.write_order, &entry); 1006 + } else { 1007 + entry.unset_q_nodes(); 1008 + } 1009 + } 1010 + 1011 + fn handle_remove_with_deques( 1012 + ao_deq_name: &str, 1013 + ao_deq: &mut Deque<KeyHashDate<K>>, 1014 + wo_deq: &mut Deque<KeyDate<K>>, 1015 + entry: TrioArc<ValueEntry<K, V>>, 1016 + counters: &mut EvictionCounters, 1017 + ) { 1018 + if entry.is_admitted() { 1019 + entry.set_admitted(false); 1020 + counters.saturating_sub(1, entry.policy_weight()); 1021 + // The following two unlink_* functions will unset the deq nodes. 1022 + Deques::unlink_ao_from_deque(ao_deq_name, ao_deq, &entry); 1023 + Deques::unlink_wo(wo_deq, &entry); 1024 + } else { 1025 + entry.unset_q_nodes(); 1026 + } 1027 + } 1028 + 1029 + fn evict_expired( 1030 + &self, 1031 + deqs: &mut Deques<K>, 1032 + batch_size: usize, 1033 + counters: &mut EvictionCounters, 1034 + ) { 1035 + let now = self.current_time_from_expiration_clock(); 1036 + 1037 + if self.is_write_order_queue_enabled() { 1038 + self.remove_expired_wo(deqs, batch_size, now, counters); 1039 + } 1040 + 1041 + if self.time_to_idle.is_some() || self.has_valid_after() { 1042 + let (window, probation, protected, wo) = ( 1043 + &mut deqs.window, 1044 + &mut deqs.probation, 1045 + &mut deqs.protected, 1046 + &mut deqs.write_order, 1047 + ); 1048 + 1049 + let mut rm_expired_ao = 1050 + |name, deq| self.remove_expired_ao(name, deq, wo, batch_size, now, counters); 1051 + 1052 + rm_expired_ao("window", window); 1053 + rm_expired_ao("probation", probation); 1054 + rm_expired_ao("protected", protected); 1055 + } 1056 + } 1057 + 1058 + #[inline] 1059 + fn remove_expired_ao( 1060 + &self, 1061 + deq_name: &str, 1062 + deq: &mut Deque<KeyHashDate<K>>, 1063 + write_order_deq: &mut Deque<KeyDate<K>>, 1064 + batch_size: usize, 1065 + now: Instant, 1066 + counters: &mut EvictionCounters, 1067 + ) { 1068 + let tti = &self.time_to_idle; 1069 + let va = &self.valid_after(); 1070 + for _ in 0..batch_size { 1071 + // Peek the front node of the deque and check if it is expired. 1072 + let key = deq.peek_front().and_then(|node| { 1073 + // TODO: Skip the entry if it is dirty. See `evict_lru_entries` method as an example. 1074 + if is_expired_entry_ao(tti, va, node, now) { 1075 + Some(Arc::clone(node.element.key())) 1076 + } else { 1077 + None 1078 + } 1079 + }); 1080 + 1081 + if key.is_none() { 1082 + break; 1083 + } 1084 + 1085 + let key = key.as_ref().unwrap(); 1086 + 1087 + // Remove the key from the map only when the entry is really 1088 + // expired. This check is needed because it is possible that the entry in 1089 + // the map has been updated or deleted but its deque node we checked 1090 + // above have not been updated yet. 1091 + let maybe_entry = self 1092 + .cache 1093 + .remove_if(key, |_, v| is_expired_entry_ao(tti, va, v, now)); 1094 + 1095 + if let Some((_k, entry)) = maybe_entry { 1096 + Self::handle_remove_with_deques(deq_name, deq, write_order_deq, entry, counters); 1097 + } else if !self.try_skip_updated_entry(key, deq_name, deq, write_order_deq) { 1098 + break; 1099 + } 1100 + } 1101 + } 1102 + 1103 + #[inline] 1104 + fn try_skip_updated_entry( 1105 + &self, 1106 + key: &K, 1107 + deq_name: &str, 1108 + deq: &mut Deque<KeyHashDate<K>>, 1109 + write_order_deq: &mut Deque<KeyDate<K>>, 1110 + ) -> bool { 1111 + if let Some(entry) = self.cache.get(key) { 1112 + if entry.is_dirty() { 1113 + // The key exists and the entry has been updated. 1114 + Deques::move_to_back_ao_in_deque(deq_name, deq, &entry); 1115 + Deques::move_to_back_wo_in_deque(write_order_deq, &entry); 1116 + true 1117 + } else { 1118 + // The key exists but something unexpected. 1119 + false 1120 + } 1121 + } else { 1122 + // Skip this entry as the key might have been invalidated. Since the 1123 + // invalidated ValueEntry (which should be still in the write op 1124 + // queue) has a pointer to this node, move the node to the back of 1125 + // the deque instead of popping (dropping) it. 1126 + deq.move_front_to_back(); 1127 + true 1128 + } 1129 + } 1130 + 1131 + #[inline] 1132 + fn remove_expired_wo( 1133 + &self, 1134 + deqs: &mut Deques<K>, 1135 + batch_size: usize, 1136 + now: Instant, 1137 + counters: &mut EvictionCounters, 1138 + ) { 1139 + let ttl = &self.time_to_live; 1140 + let va = &self.valid_after(); 1141 + for _ in 0..batch_size { 1142 + let key = deqs.write_order.peek_front().and_then(|node| { 1143 + // TODO: Skip the entry if it is dirty. See `evict_lru_entries` method as an example. 1144 + if is_expired_entry_wo(ttl, va, node, now) { 1145 + Some(Arc::clone(node.element.key())) 1146 + } else { 1147 + None 1148 + } 1149 + }); 1150 + 1151 + if key.is_none() { 1152 + break; 1153 + } 1154 + 1155 + let key = key.as_ref().unwrap(); 1156 + 1157 + let maybe_entry = self 1158 + .cache 1159 + .remove_if(key, |_, v| is_expired_entry_wo(ttl, va, v, now)); 1160 + 1161 + if let Some((_k, entry)) = maybe_entry { 1162 + Self::handle_remove(deqs, entry, counters); 1163 + } else if let Some(entry) = self.cache.get(key) { 1164 + if entry.is_dirty() { 1165 + deqs.move_to_back_ao(&entry); 1166 + deqs.move_to_back_wo(&entry); 1167 + } else { 1168 + // The key exists but something unexpected. Break. 1169 + break; 1170 + } 1171 + } else { 1172 + // Skip this entry as the key might have been invalidated. Since the 1173 + // invalidated ValueEntry (which should be still in the write op 1174 + // queue) has a pointer to this node, move the node to the back of 1175 + // the deque instead of popping (dropping) it. 1176 + deqs.write_order.move_front_to_back(); 1177 + } 1178 + } 1179 + } 1180 + 1181 + fn evict_lru_entries( 1182 + &self, 1183 + deqs: &mut Deques<K>, 1184 + batch_size: usize, 1185 + weights_to_evict: u64, 1186 + counters: &mut EvictionCounters, 1187 + ) { 1188 + const DEQ_NAME: &str = "probation"; 1189 + let mut evicted = 0u64; 1190 + let (deq, write_order_deq) = (&mut deqs.probation, &mut deqs.write_order); 1191 + 1192 + for _ in 0..batch_size { 1193 + if evicted >= weights_to_evict { 1194 + break; 1195 + } 1196 + 1197 + let maybe_key_and_ts = deq.peek_front().map(|node| { 1198 + let entry_info = node.element.entry_info(); 1199 + ( 1200 + Arc::clone(node.element.key()), 1201 + entry_info.is_dirty(), 1202 + entry_info.last_modified(), 1203 + ) 1204 + }); 1205 + 1206 + let (key, ts) = match maybe_key_and_ts { 1207 + Some((key, false, Some(ts))) => (key, ts), 1208 + // TODO: Remove the second pattern `Some((_key, false, None))` once we change 1209 + // `last_modified` and `last_accessed` in `EntryInfo` from `Option<Instant>` to 1210 + // `Instant`. 1211 + Some((key, true, _)) | Some((key, false, None)) => { 1212 + if self.try_skip_updated_entry(&key, DEQ_NAME, deq, write_order_deq) { 1213 + continue; 1214 + } else { 1215 + break; 1216 + } 1217 + } 1218 + None => break, 1219 + }; 1220 + 1221 + let maybe_entry = self.cache.remove_if(&key, |_, v| { 1222 + if let Some(lm) = v.last_modified() { 1223 + lm == ts 1224 + } else { 1225 + false 1226 + } 1227 + }); 1228 + 1229 + if let Some((_k, entry)) = maybe_entry { 1230 + let weight = entry.policy_weight(); 1231 + Self::handle_remove_with_deques(DEQ_NAME, deq, write_order_deq, entry, counters); 1232 + evicted = evicted.saturating_add(weight as u64); 1233 + } else if !self.try_skip_updated_entry(&key, DEQ_NAME, deq, write_order_deq) { 1234 + break; 1235 + } 1236 + } 1237 + } 1238 + } 1239 + 1240 + // 1241 + // for testing 1242 + // 1243 + #[cfg(test)] 1244 + impl<K, V, S> Inner<K, V, S> 1245 + where 1246 + K: Hash + Eq, 1247 + S: BuildHasher + Clone, 1248 + { 1249 + fn set_expiration_clock(&self, clock: Option<Clock>) { 1250 + let mut exp_clock = self.expiration_clock.write().expect("lock poisoned"); 1251 + if let Some(clock) = clock { 1252 + *exp_clock = Some(clock); 1253 + self.has_expiration_clock.store(true, Ordering::SeqCst); 1254 + } else { 1255 + self.has_expiration_clock.store(false, Ordering::SeqCst); 1256 + *exp_clock = None; 1257 + } 1258 + } 1259 + } 1260 + 1261 + // 1262 + // private free-standing functions 1263 + // 1264 + #[inline] 1265 + fn is_expired_entry_ao( 1266 + time_to_idle: &Option<Duration>, 1267 + valid_after: &Option<Instant>, 1268 + entry: &impl AccessTime, 1269 + now: Instant, 1270 + ) -> bool { 1271 + if let Some(ts) = entry.last_accessed() { 1272 + if let Some(va) = valid_after { 1273 + if ts < *va { 1274 + return true; 1275 + } 1276 + } 1277 + if let Some(tti) = time_to_idle { 1278 + let checked_add = ts.checked_add(*tti); 1279 + if checked_add.is_none() { 1280 + panic!("ttl overflow") 1281 + } 1282 + return checked_add.unwrap() <= now; 1283 + } 1284 + } 1285 + false 1286 + } 1287 + 1288 + #[inline] 1289 + fn is_expired_entry_wo( 1290 + time_to_live: &Option<Duration>, 1291 + valid_after: &Option<Instant>, 1292 + entry: &impl AccessTime, 1293 + now: Instant, 1294 + ) -> bool { 1295 + if let Some(ts) = entry.last_modified() { 1296 + if let Some(va) = valid_after { 1297 + if ts < *va { 1298 + return true; 1299 + } 1300 + } 1301 + if let Some(ttl) = time_to_live { 1302 + let checked_add = ts.checked_add(*ttl); 1303 + if checked_add.is_none() { 1304 + panic!("ttl overflow"); 1305 + } 1306 + return checked_add.unwrap() <= now; 1307 + } 1308 + } 1309 + false 1310 + } 1311 + 1312 + #[cfg(test)] 1313 + mod tests { 1314 + use super::BaseCache; 1315 + 1316 + #[cfg_attr(target_pointer_width = "16", ignore)] 1317 + #[test] 1318 + fn test_skt_capacity_will_not_overflow() { 1319 + use std::collections::hash_map::RandomState; 1320 + 1321 + // power of two 1322 + let pot = |exp| 2u64.pow(exp); 1323 + 1324 + let ensure_sketch_len = |max_capacity, len, name| { 1325 + let cache = BaseCache::<u8, u8>::new( 1326 + Some(max_capacity), 1327 + None, 1328 + RandomState::default(), 1329 + None, 1330 + None, 1331 + None, 1332 + ); 1333 + cache.inner.enable_frequency_sketch_for_testing(); 1334 + assert_eq!( 1335 + cache 1336 + .inner 1337 + .frequency_sketch 1338 + .read() 1339 + .expect("lock poisoned") 1340 + .table_len(), 1341 + len as usize, 1342 + "{}", 1343 + name 1344 + ); 1345 + }; 1346 + 1347 + if cfg!(target_pointer_width = "32") { 1348 + let pot24 = pot(24); 1349 + let pot16 = pot(16); 1350 + ensure_sketch_len(0, 128, "0"); 1351 + ensure_sketch_len(128, 128, "128"); 1352 + ensure_sketch_len(pot16, pot16, "pot16"); 1353 + // due to ceiling to next_power_of_two 1354 + ensure_sketch_len(pot16 + 1, pot(17), "pot16 + 1"); 1355 + // due to ceiling to next_power_of_two 1356 + ensure_sketch_len(pot24 - 1, pot24, "pot24 - 1"); 1357 + ensure_sketch_len(pot24, pot24, "pot24"); 1358 + ensure_sketch_len(pot(27), pot24, "pot(27)"); 1359 + ensure_sketch_len(u32::MAX as u64, pot24, "u32::MAX"); 1360 + } else { 1361 + // target_pointer_width: 64 or larger. 1362 + let pot30 = pot(30); 1363 + let pot16 = pot(16); 1364 + ensure_sketch_len(0, 128, "0"); 1365 + ensure_sketch_len(128, 128, "128"); 1366 + ensure_sketch_len(pot16, pot16, "pot16"); 1367 + // due to ceiling to next_power_of_two 1368 + ensure_sketch_len(pot16 + 1, pot(17), "pot16 + 1"); 1369 + 1370 + // The following tests will allocate large memory (~8GiB). 1371 + // Skip when running on Circle CI. 1372 + if !cfg!(circleci) { 1373 + // due to ceiling to next_power_of_two 1374 + ensure_sketch_len(pot30 - 1, pot30, "pot30- 1"); 1375 + ensure_sketch_len(pot30, pot30, "pot30"); 1376 + ensure_sketch_len(u64::MAX, pot30, "u64::MAX"); 1377 + } 1378 + }; 1379 + } 1380 + }

+249

crates/mini-moka-vendored/src/sync/builder.rs

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··· 1 + use super::Cache; 2 + use crate::{common::builder_utils, common::concurrent::Weigher}; 3 + 4 + use std::{ 5 + collections::hash_map::RandomState, 6 + hash::{BuildHasher, Hash}, 7 + marker::PhantomData, 8 + sync::Arc, 9 + time::Duration, 10 + }; 11 + 12 + /// Builds a [`Cache`][cache-struct] or with various configuration knobs. 13 + /// 14 + /// [cache-struct]: ./struct.Cache.html 15 + /// 16 + /// # Examples 17 + /// 18 + /// ```rust 19 + /// use mini_moka::sync::Cache; 20 + /// use std::time::Duration; 21 + /// 22 + /// let cache = Cache::builder() 23 + /// // Max 10,000 entries 24 + /// .max_capacity(10_000) 25 + /// // Time to live (TTL): 30 minutes 26 + /// .time_to_live(Duration::from_secs(30 * 60)) 27 + /// // Time to idle (TTI): 5 minutes 28 + /// .time_to_idle(Duration::from_secs( 5 * 60)) 29 + /// // Create the cache. 30 + /// .build(); 31 + /// 32 + /// // This entry will expire after 5 minutes (TTI) if there is no get(). 33 + /// cache.insert(0, "zero"); 34 + /// 35 + /// // This get() will extend the entry life for another 5 minutes. 36 + /// cache.get(&0); 37 + /// 38 + /// // Even though we keep calling get(), the entry will expire 39 + /// // after 30 minutes (TTL) from the insert(). 40 + /// ``` 41 + /// 42 + #[must_use] 43 + pub struct CacheBuilder<K, V, C> { 44 + max_capacity: Option<u64>, 45 + initial_capacity: Option<usize>, 46 + weigher: Option<Weigher<K, V>>, 47 + time_to_live: Option<Duration>, 48 + time_to_idle: Option<Duration>, 49 + cache_type: PhantomData<C>, 50 + } 51 + 52 + impl<K, V> Default for CacheBuilder<K, V, Cache<K, V, RandomState>> 53 + where 54 + K: Eq + Hash + Send + Sync + 'static, 55 + V: Clone + Send + Sync + 'static, 56 + { 57 + fn default() -> Self { 58 + Self { 59 + max_capacity: None, 60 + initial_capacity: None, 61 + weigher: None, 62 + time_to_live: None, 63 + time_to_idle: None, 64 + cache_type: Default::default(), 65 + } 66 + } 67 + } 68 + 69 + impl<K, V> CacheBuilder<K, V, Cache<K, V, RandomState>> 70 + where 71 + K: Eq + Hash + Send + Sync + 'static, 72 + V: Clone + Send + Sync + 'static, 73 + { 74 + /// Construct a new `CacheBuilder` that will be used to build a `Cache` or 75 + /// `SegmentedCache` holding up to `max_capacity` entries. 76 + pub fn new(max_capacity: u64) -> Self { 77 + Self { 78 + max_capacity: Some(max_capacity), 79 + ..Default::default() 80 + } 81 + } 82 + 83 + /// Builds a `Cache<K, V>`. 84 + /// 85 + /// If you want to build a `SegmentedCache<K, V>`, call `segments` method before 86 + /// calling this method. 87 + /// 88 + /// # Panics 89 + /// 90 + /// Panics if configured with either `time_to_live` or `time_to_idle` higher than 91 + /// 1000 years. This is done to protect against overflow when computing key 92 + /// expiration. 93 + pub fn build(self) -> Cache<K, V, RandomState> { 94 + let build_hasher = RandomState::default(); 95 + builder_utils::ensure_expirations_or_panic(self.time_to_live, self.time_to_idle); 96 + Cache::with_everything( 97 + self.max_capacity, 98 + self.initial_capacity, 99 + build_hasher, 100 + self.weigher, 101 + self.time_to_live, 102 + self.time_to_idle, 103 + ) 104 + } 105 + 106 + /// Builds a `Cache<K, V, S>`, with the given `hasher`. 107 + /// 108 + /// If you want to build a `SegmentedCache<K, V>`, call `segments` method before 109 + /// calling this method. 110 + /// 111 + /// # Panics 112 + /// 113 + /// Panics if configured with either `time_to_live` or `time_to_idle` higher than 114 + /// 1000 years. This is done to protect against overflow when computing key 115 + /// expiration. 116 + pub fn build_with_hasher<S>(self, hasher: S) -> Cache<K, V, S> 117 + where 118 + S: BuildHasher + Clone + Send + Sync + 'static, 119 + { 120 + builder_utils::ensure_expirations_or_panic(self.time_to_live, self.time_to_idle); 121 + Cache::with_everything( 122 + self.max_capacity, 123 + self.initial_capacity, 124 + hasher, 125 + self.weigher, 126 + self.time_to_live, 127 + self.time_to_idle, 128 + ) 129 + } 130 + } 131 + 132 + impl<K, V, C> CacheBuilder<K, V, C> { 133 + /// Sets the max capacity of the cache. 134 + pub fn max_capacity(self, max_capacity: u64) -> Self { 135 + Self { 136 + max_capacity: Some(max_capacity), 137 + ..self 138 + } 139 + } 140 + 141 + /// Sets the initial capacity (number of entries) of the cache. 142 + pub fn initial_capacity(self, number_of_entries: usize) -> Self { 143 + Self { 144 + initial_capacity: Some(number_of_entries), 145 + ..self 146 + } 147 + } 148 + 149 + /// Sets the weigher closure of the cache. 150 + /// 151 + /// The closure should take `&K` and `&V` as the arguments and returns a `u32` 152 + /// representing the relative size of the entry. 153 + pub fn weigher(self, weigher: impl Fn(&K, &V) -> u32 + Send + Sync + 'static) -> Self { 154 + Self { 155 + weigher: Some(Arc::new(weigher)), 156 + ..self 157 + } 158 + } 159 + 160 + /// Sets the time to live of the cache. 161 + /// 162 + /// A cached entry will be expired after the specified duration past from 163 + /// `insert`. 164 + /// 165 + /// # Panics 166 + /// 167 + /// `CacheBuilder::build*` methods will panic if the given `duration` is longer 168 + /// than 1000 years. This is done to protect against overflow when computing key 169 + /// expiration. 170 + pub fn time_to_live(self, duration: Duration) -> Self { 171 + Self { 172 + time_to_live: Some(duration), 173 + ..self 174 + } 175 + } 176 + 177 + /// Sets the time to idle of the cache. 178 + /// 179 + /// A cached entry will be expired after the specified duration past from `get` 180 + /// or `insert`. 181 + /// 182 + /// # Panics 183 + /// 184 + /// `CacheBuilder::build*` methods will panic if the given `duration` is longer 185 + /// than 1000 years. This is done to protect against overflow when computing key 186 + /// expiration. 187 + pub fn time_to_idle(self, duration: Duration) -> Self { 188 + Self { 189 + time_to_idle: Some(duration), 190 + ..self 191 + } 192 + } 193 + } 194 + 195 + #[cfg(test)] 196 + mod tests { 197 + use super::CacheBuilder; 198 + 199 + use std::time::Duration; 200 + 201 + #[test] 202 + fn build_cache() { 203 + // Cache<char, String> 204 + let cache = CacheBuilder::new(100).build(); 205 + let policy = cache.policy(); 206 + 207 + assert_eq!(policy.max_capacity(), Some(100)); 208 + assert_eq!(policy.time_to_live(), None); 209 + assert_eq!(policy.time_to_idle(), None); 210 + 211 + cache.insert('a', "Alice"); 212 + assert_eq!(cache.get(&'a'), Some("Alice")); 213 + 214 + let cache = CacheBuilder::new(100) 215 + .time_to_live(Duration::from_secs(45 * 60)) 216 + .time_to_idle(Duration::from_secs(15 * 60)) 217 + .build(); 218 + let policy = cache.policy(); 219 + 220 + assert_eq!(policy.max_capacity(), Some(100)); 221 + assert_eq!(policy.time_to_live(), Some(Duration::from_secs(45 * 60))); 222 + assert_eq!(policy.time_to_idle(), Some(Duration::from_secs(15 * 60))); 223 + 224 + cache.insert('a', "Alice"); 225 + assert_eq!(cache.get(&'a'), Some("Alice")); 226 + } 227 + 228 + #[test] 229 + #[should_panic(expected = "time_to_live is longer than 1000 years")] 230 + fn build_cache_too_long_ttl() { 231 + let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600; 232 + let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100); 233 + let duration = Duration::from_secs(thousand_years_secs); 234 + builder 235 + .time_to_live(duration + Duration::from_secs(1)) 236 + .build(); 237 + } 238 + 239 + #[test] 240 + #[should_panic(expected = "time_to_idle is longer than 1000 years")] 241 + fn build_cache_too_long_tti() { 242 + let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600; 243 + let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100); 244 + let duration = Duration::from_secs(thousand_years_secs); 245 + builder 246 + .time_to_idle(duration + Duration::from_secs(1)) 247 + .build(); 248 + } 249 + }

+1120

crates/mini-moka-vendored/src/sync/cache.rs

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··· 1 + use super::{base_cache::BaseCache, CacheBuilder, ConcurrentCacheExt, EntryRef, Iter}; 2 + use crate::{ 3 + common::{ 4 + concurrent::{ 5 + constants::{MAX_SYNC_REPEATS, WRITE_RETRY_INTERVAL_MICROS}, 6 + housekeeper::{Housekeeper, InnerSync}, 7 + Weigher, WriteOp, 8 + }, 9 + time::Instant, 10 + }, 11 + Policy, 12 + }; 13 + 14 + use crossbeam_channel::{Sender, TrySendError}; 15 + use std::{ 16 + borrow::Borrow, 17 + collections::hash_map::RandomState, 18 + fmt, 19 + hash::{BuildHasher, Hash}, 20 + sync::Arc, 21 + time::Duration, 22 + }; 23 + 24 + /// A thread-safe concurrent in-memory cache built upon [`dashmap::DashMap`][dashmap]. 25 + /// 26 + /// The `Cache` uses `DashMap` as the central key-value storage. It performs a 27 + /// best-effort bounding of the map using an entry replacement algorithm to determine 28 + /// which entries to evict when the capacity is exceeded. 29 + /// 30 + /// To use this cache, enable a crate feature called "dash" in your Cargo.toml. 31 + /// Please note that the API of `dash` cache will _be changed very often_ in next few 32 + /// releases as this is yet an experimental component. 33 + /// 34 + /// # Examples 35 + /// 36 + /// Cache entries are manually added using [`insert`](#method.insert) method, and are 37 + /// stored in the cache until either evicted or manually invalidated. 38 + /// 39 + /// Here's an example of reading and updating a cache by using multiple threads: 40 + /// 41 + /// ```rust 42 + /// use mini_moka::sync::Cache; 43 + /// 44 + /// use std::thread; 45 + /// 46 + /// fn value(n: usize) -> String { 47 + /// format!("value {}", n) 48 + /// } 49 + /// 50 + /// const NUM_THREADS: usize = 16; 51 + /// const NUM_KEYS_PER_THREAD: usize = 64; 52 + /// 53 + /// // Create a cache that can store up to 10,000 entries. 54 + /// let cache = Cache::new(10_000); 55 + /// 56 + /// // Spawn threads and read and update the cache simultaneously. 57 + /// let threads: Vec<_> = (0..NUM_THREADS) 58 + /// .map(|i| { 59 + /// // To share the same cache across the threads, clone it. 60 + /// // This is a cheap operation. 61 + /// let my_cache = cache.clone(); 62 + /// let start = i * NUM_KEYS_PER_THREAD; 63 + /// let end = (i + 1) * NUM_KEYS_PER_THREAD; 64 + /// 65 + /// thread::spawn(move || { 66 + /// // Insert 64 entries. (NUM_KEYS_PER_THREAD = 64) 67 + /// for key in start..end { 68 + /// my_cache.insert(key, value(key)); 69 + /// // get() returns Option<String>, a clone of the stored value. 70 + /// assert_eq!(my_cache.get(&key), Some(value(key))); 71 + /// } 72 + /// 73 + /// // Invalidate every 4 element of the inserted entries. 74 + /// for key in (start..end).step_by(4) { 75 + /// my_cache.invalidate(&key); 76 + /// } 77 + /// }) 78 + /// }) 79 + /// .collect(); 80 + /// 81 + /// // Wait for all threads to complete. 82 + /// threads.into_iter().for_each(|t| t.join().expect("Failed")); 83 + /// 84 + /// // Verify the result. 85 + /// for key in 0..(NUM_THREADS * NUM_KEYS_PER_THREAD) { 86 + /// if key % 4 == 0 { 87 + /// assert_eq!(cache.get(&key), None); 88 + /// } else { 89 + /// assert_eq!(cache.get(&key), Some(value(key))); 90 + /// } 91 + /// } 92 + /// ``` 93 + /// 94 + /// # Avoiding to clone the value at `get` 95 + /// 96 + /// The return type of `get` method is `Option<V>` instead of `Option<&V>`. Every 97 + /// time `get` is called for an existing key, it creates a clone of the stored value 98 + /// `V` and returns it. This is because the `Cache` allows concurrent updates from 99 + /// threads so a value stored in the cache can be dropped or replaced at any time by 100 + /// any other thread. `get` cannot return a reference `&V` as it is impossible to 101 + /// guarantee the value outlives the reference. 102 + /// 103 + /// If you want to store values that will be expensive to clone, wrap them by 104 + /// `std::sync::Arc` before storing in a cache. [`Arc`][rustdoc-std-arc] is a 105 + /// thread-safe reference-counted pointer and its `clone()` method is cheap. 106 + /// 107 + /// [rustdoc-std-arc]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html 108 + /// 109 + /// # Size-based Eviction 110 + /// 111 + /// ```rust 112 + /// use std::convert::TryInto; 113 + /// use mini_moka::sync::Cache; 114 + /// 115 + /// // Evict based on the number of entries in the cache. 116 + /// let cache = Cache::builder() 117 + /// // Up to 10,000 entries. 118 + /// .max_capacity(10_000) 119 + /// // Create the cache. 120 + /// .build(); 121 + /// cache.insert(1, "one".to_string()); 122 + /// 123 + /// // Evict based on the byte length of strings in the cache. 124 + /// let cache = Cache::builder() 125 + /// // A weigher closure takes &K and &V and returns a u32 126 + /// // representing the relative size of the entry. 127 + /// .weigher(|_key, value: &String| -> u32 { 128 + /// value.len().try_into().unwrap_or(u32::MAX) 129 + /// }) 130 + /// // This cache will hold up to 32MiB of values. 131 + /// .max_capacity(32 * 1024 * 1024) 132 + /// .build(); 133 + /// cache.insert(2, "two".to_string()); 134 + /// ``` 135 + /// 136 + /// If your cache should not grow beyond a certain size, use the `max_capacity` 137 + /// method of the [`CacheBuilder`][builder-struct] to set the upper bound. The cache 138 + /// will try to evict entries that have not been used recently or very often. 139 + /// 140 + /// At the cache creation time, a weigher closure can be set by the `weigher` method 141 + /// of the `CacheBuilder`. A weigher closure takes `&K` and `&V` as the arguments and 142 + /// returns a `u32` representing the relative size of the entry: 143 + /// 144 + /// - If the `weigher` is _not_ set, the cache will treat each entry has the same 145 + /// size of `1`. This means the cache will be bounded by the number of entries. 146 + /// - If the `weigher` is set, the cache will call the weigher to calculate the 147 + /// weighted size (relative size) on an entry. This means the cache will be bounded 148 + /// by the total weighted size of entries. 149 + /// 150 + /// Note that weighted sizes are not used when making eviction selections. 151 + /// 152 + /// [builder-struct]: ./struct.CacheBuilder.html 153 + /// 154 + /// # Time-based Expirations 155 + /// 156 + /// `Cache` supports the following expiration policies: 157 + /// 158 + /// - **Time to live**: A cached entry will be expired after the specified duration 159 + /// past from `insert`. 160 + /// - **Time to idle**: A cached entry will be expired after the specified duration 161 + /// past from `get` or `insert`. 162 + /// 163 + /// ```rust 164 + /// use mini_moka::sync::Cache; 165 + /// use std::time::Duration; 166 + /// 167 + /// let cache = Cache::builder() 168 + /// // Time to live (TTL): 30 minutes 169 + /// .time_to_live(Duration::from_secs(30 * 60)) 170 + /// // Time to idle (TTI): 5 minutes 171 + /// .time_to_idle(Duration::from_secs( 5 * 60)) 172 + /// // Create the cache. 173 + /// .build(); 174 + /// 175 + /// // This entry will expire after 5 minutes (TTI) if there is no get(). 176 + /// cache.insert(0, "zero"); 177 + /// 178 + /// // This get() will extend the entry life for another 5 minutes. 179 + /// cache.get(&0); 180 + /// 181 + /// // Even though we keep calling get(), the entry will expire 182 + /// // after 30 minutes (TTL) from the insert(). 183 + /// ``` 184 + /// 185 + /// # Thread Safety 186 + /// 187 + /// All methods provided by the `Cache` are considered thread-safe, and can be safely 188 + /// accessed by multiple concurrent threads. 189 + /// 190 + /// - `Cache<K, V, S>` requires trait bounds `Send`, `Sync` and `'static` for `K` 191 + /// (key), `V` (value) and `S` (hasher state). 192 + /// - `Cache<K, V, S>` will implement `Send` and `Sync`. 193 + /// 194 + /// # Sharing a cache across threads 195 + /// 196 + /// To share a cache across threads, do one of the followings: 197 + /// 198 + /// - Create a clone of the cache by calling its `clone` method and pass it to other 199 + /// thread. 200 + /// - Wrap the cache by a `sync::OnceCell` or `sync::Lazy` from 201 + /// [once_cell][once-cell-crate] create, and set it to a `static` variable. 202 + /// 203 + /// Cloning is a cheap operation for `Cache` as it only creates thread-safe 204 + /// reference-counted pointers to the internal data structures. 205 + /// 206 + /// [once-cell-crate]: https://crates.io/crates/once_cell 207 + /// 208 + /// # Hashing Algorithm 209 + /// 210 + /// By default, `Cache` uses a hashing algorithm selected to provide resistance 211 + /// against HashDoS attacks. It will be the same one used by 212 + /// `std::collections::HashMap`, which is currently SipHash 1-3. 213 + /// 214 + /// While SipHash's performance is very competitive for medium sized keys, other 215 + /// hashing algorithms will outperform it for small keys such as integers as well as 216 + /// large keys such as long strings. However those algorithms will typically not 217 + /// protect against attacks such as HashDoS. 218 + /// 219 + /// The hashing algorithm can be replaced on a per-`Cache` basis using the 220 + /// [`build_with_hasher`][build-with-hasher-method] method of the 221 + /// `CacheBuilder`. Many alternative algorithms are available on crates.io, such 222 + /// as the [aHash][ahash-crate] crate. 223 + /// 224 + /// [build-with-hasher-method]: ./struct.CacheBuilder.html#method.build_with_hasher 225 + /// [ahash-crate]: https://crates.io/crates/ahash 226 + /// 227 + pub struct Cache<K, V, S = RandomState> { 228 + base: BaseCache<K, V, S>, 229 + } 230 + 231 + // TODO: https://github.com/moka-rs/moka/issues/54 232 + #[allow(clippy::non_send_fields_in_send_ty)] 233 + unsafe impl<K, V, S> Send for Cache<K, V, S> 234 + where 235 + K: Send + Sync, 236 + V: Send + Sync, 237 + S: Send, 238 + { 239 + } 240 + 241 + unsafe impl<K, V, S> Sync for Cache<K, V, S> 242 + where 243 + K: Send + Sync, 244 + V: Send + Sync, 245 + S: Sync, 246 + { 247 + } 248 + 249 + // NOTE: We cannot do `#[derive(Clone)]` because it will add `Clone` bound to `K`. 250 + impl<K, V, S> Clone for Cache<K, V, S> { 251 + /// Makes a clone of this shared cache. 252 + /// 253 + /// This operation is cheap as it only creates thread-safe reference counted 254 + /// pointers to the shared internal data structures. 255 + fn clone(&self) -> Self { 256 + Self { 257 + base: self.base.clone(), 258 + } 259 + } 260 + } 261 + 262 + impl<K, V, S> fmt::Debug for Cache<K, V, S> 263 + where 264 + K: Eq + Hash + fmt::Debug, 265 + V: fmt::Debug, 266 + S: BuildHasher + Clone, 267 + { 268 + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { 269 + let mut d_map = f.debug_map(); 270 + 271 + for r in self.iter() { 272 + let (k, v) = r.pair(); 273 + d_map.entry(k, v); 274 + } 275 + 276 + d_map.finish() 277 + } 278 + } 279 + 280 + impl<K, V> Cache<K, V, RandomState> 281 + where 282 + K: Hash + Eq + Send + Sync + 'static, 283 + V: Clone + Send + Sync + 'static, 284 + { 285 + /// Constructs a new `Cache<K, V>` that will store up to the `max_capacity`. 286 + /// 287 + /// To adjust various configuration knobs such as `initial_capacity` or 288 + /// `time_to_live`, use the [`CacheBuilder`][builder-struct]. 289 + /// 290 + /// [builder-struct]: ./struct.CacheBuilder.html 291 + pub fn new(max_capacity: u64) -> Self { 292 + let build_hasher = RandomState::default(); 293 + Self::with_everything(Some(max_capacity), None, build_hasher, None, None, None) 294 + } 295 + 296 + /// Returns a [`CacheBuilder`][builder-struct], which can builds a `Cache` with 297 + /// various configuration knobs. 298 + /// 299 + /// [builder-struct]: ./struct.CacheBuilder.html 300 + pub fn builder() -> CacheBuilder<K, V, Cache<K, V, RandomState>> { 301 + CacheBuilder::default() 302 + } 303 + } 304 + 305 + impl<K, V, S> Cache<K, V, S> { 306 + /// Returns a read-only cache policy of this cache. 307 + /// 308 + /// At this time, cache policy cannot be modified after cache creation. 309 + /// A future version may support to modify it. 310 + pub fn policy(&self) -> Policy { 311 + self.base.policy() 312 + } 313 + 314 + /// Returns an approximate number of entries in this cache. 315 + /// 316 + /// The value returned is _an estimate_; the actual count may differ if there are 317 + /// concurrent insertions or removals, or if some entries are pending removal due 318 + /// to expiration. This inaccuracy can be mitigated by performing a `sync()` 319 + /// first. 320 + /// 321 + /// # Example 322 + /// 323 + /// ```rust 324 + /// use mini_moka::sync::Cache; 325 + /// 326 + /// let cache = Cache::new(10); 327 + /// cache.insert('n', "Netherland Dwarf"); 328 + /// cache.insert('l', "Lop Eared"); 329 + /// cache.insert('d', "Dutch"); 330 + /// 331 + /// // Ensure an entry exists. 332 + /// assert!(cache.contains_key(&'n')); 333 + /// 334 + /// // However, followings may print stale number zeros instead of threes. 335 + /// println!("{}", cache.entry_count()); // -> 0 336 + /// println!("{}", cache.weighted_size()); // -> 0 337 + /// 338 + /// // To mitigate the inaccuracy, bring `ConcurrentCacheExt` trait to 339 + /// // the scope so we can use `sync` method. 340 + /// use mini_moka::sync::ConcurrentCacheExt; 341 + /// // Call `sync` to run pending internal tasks. 342 + /// cache.sync(); 343 + /// 344 + /// // Followings will print the actual numbers. 345 + /// println!("{}", cache.entry_count()); // -> 3 346 + /// println!("{}", cache.weighted_size()); // -> 3 347 + /// ``` 348 + /// 349 + pub fn entry_count(&self) -> u64 { 350 + self.base.entry_count() 351 + } 352 + 353 + /// Returns an approximate total weighted size of entries in this cache. 354 + /// 355 + /// The value returned is _an estimate_; the actual size may differ if there are 356 + /// concurrent insertions or removals, or if some entries are pending removal due 357 + /// to expiration. This inaccuracy can be mitigated by performing a `sync()` 358 + /// first. See [`entry_count`](#method.entry_count) for a sample code. 359 + pub fn weighted_size(&self) -> u64 { 360 + self.base.weighted_size() 361 + } 362 + } 363 + 364 + impl<K, V, S> Cache<K, V, S> 365 + where 366 + K: Hash + Eq + Send + Sync + 'static, 367 + V: Clone + Send + Sync + 'static, 368 + S: BuildHasher + Clone + Send + Sync + 'static, 369 + { 370 + pub(crate) fn with_everything( 371 + max_capacity: Option<u64>, 372 + initial_capacity: Option<usize>, 373 + build_hasher: S, 374 + weigher: Option<Weigher<K, V>>, 375 + time_to_live: Option<Duration>, 376 + time_to_idle: Option<Duration>, 377 + ) -> Self { 378 + Self { 379 + base: BaseCache::new( 380 + max_capacity, 381 + initial_capacity, 382 + build_hasher, 383 + weigher, 384 + time_to_live, 385 + time_to_idle, 386 + ), 387 + } 388 + } 389 + 390 + /// Returns `true` if the cache contains a value for the key. 391 + /// 392 + /// Unlike the `get` method, this method is not considered a cache read operation, 393 + /// so it does not update the historic popularity estimator or reset the idle 394 + /// timer for the key. 395 + /// 396 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 397 + /// on the borrowed form _must_ match those for the key type. 398 + pub fn contains_key<Q>(&self, key: &Q) -> bool 399 + where 400 + Arc<K>: Borrow<Q>, 401 + Q: Hash + Eq + ?Sized, 402 + { 403 + self.base.contains_key(key) 404 + } 405 + 406 + /// Returns a _clone_ of the value corresponding to the key. 407 + /// 408 + /// If you want to store values that will be expensive to clone, wrap them by 409 + /// `std::sync::Arc` before storing in a cache. [`Arc`][rustdoc-std-arc] is a 410 + /// thread-safe reference-counted pointer and its `clone()` method is cheap. 411 + /// 412 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 413 + /// on the borrowed form _must_ match those for the key type. 414 + /// 415 + /// [rustdoc-std-arc]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html 416 + pub fn get<Q>(&self, key: &Q) -> Option<V> 417 + where 418 + Arc<K>: Borrow<Q>, 419 + Q: Hash + Eq + ?Sized, 420 + { 421 + self.base.get_with_hash(key, self.base.hash(key)) 422 + } 423 + 424 + /// Deprecated, replaced with [`get`](#method.get) 425 + #[doc(hidden)] 426 + #[deprecated(since = "0.8.0", note = "Replaced with `get`")] 427 + pub fn get_if_present<Q>(&self, key: &Q) -> Option<V> 428 + where 429 + Arc<K>: Borrow<Q>, 430 + Q: Hash + Eq + ?Sized, 431 + { 432 + self.get(key) 433 + } 434 + 435 + /// Inserts a key-value pair into the cache. 436 + /// 437 + /// If the cache has this key present, the value is updated. 438 + pub fn insert(&self, key: K, value: V) { 439 + let hash = self.base.hash(&key); 440 + let key = Arc::new(key); 441 + self.insert_with_hash(key, hash, value) 442 + } 443 + 444 + pub(crate) fn insert_with_hash(&self, key: Arc<K>, hash: u64, value: V) { 445 + let (op, now) = self.base.do_insert_with_hash(key, hash, value); 446 + let hk = self.base.housekeeper.as_ref(); 447 + Self::schedule_write_op( 448 + self.base.inner.as_ref(), 449 + &self.base.write_op_ch, 450 + op, 451 + now, 452 + hk, 453 + ) 454 + .expect("Failed to insert"); 455 + } 456 + 457 + /// Discards any cached value for the key. 458 + /// 459 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 460 + /// on the borrowed form _must_ match those for the key type. 461 + pub fn invalidate<Q>(&self, key: &Q) 462 + where 463 + Arc<K>: Borrow<Q>, 464 + Q: Hash + Eq + ?Sized, 465 + { 466 + if let Some(kv) = self.base.remove_entry(key) { 467 + let op = WriteOp::Remove(kv); 468 + let now = self.base.current_time_from_expiration_clock(); 469 + let hk = self.base.housekeeper.as_ref(); 470 + Self::schedule_write_op( 471 + self.base.inner.as_ref(), 472 + &self.base.write_op_ch, 473 + op, 474 + now, 475 + hk, 476 + ) 477 + .expect("Failed to remove"); 478 + } 479 + } 480 + 481 + /// Discards all cached values. 482 + /// 483 + /// This method returns immediately and a background thread will evict all the 484 + /// cached values inserted before the time when this method was called. It is 485 + /// guaranteed that the `get` method must not return these invalidated values 486 + /// even if they have not been evicted. 487 + /// 488 + /// Like the `invalidate` method, this method does not clear the historic 489 + /// popularity estimator of keys so that it retains the client activities of 490 + /// trying to retrieve an item. 491 + pub fn invalidate_all(&self) { 492 + self.base.invalidate_all(); 493 + } 494 + } 495 + 496 + // Clippy beta 0.1.83 (f41c7ed9889 2024-10-31) warns about unused lifetimes on 'a. 497 + // This seems a false positive. The lifetimes are used in the trait bounds. 498 + // https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes 499 + #[allow(clippy::extra_unused_lifetimes)] 500 + impl<'a, K, V, S> Cache<K, V, S> 501 + where 502 + K: 'a + Eq + Hash, 503 + V: 'a, 504 + S: BuildHasher + Clone, 505 + { 506 + /// Creates an iterator visiting all key-value pairs in arbitrary order. The 507 + /// iterator element type is [`EntryRef<'a, K, V, S>`][moka-entry-ref]. 508 + /// 509 + /// Unlike the `get` method, visiting entries via an iterator do not update the 510 + /// historic popularity estimator or reset idle timers for keys. 511 + /// 512 + /// # Locking behavior 513 + /// 514 + /// This iterator relies on the iterator of [`dashmap::DashMap`][dashmap-iter], 515 + /// which employs read-write locks. May deadlock if the thread holding an 516 + /// iterator attempts to update the cache. 517 + /// 518 + /// [moka-entry-ref]: ./struct.EntryRef.html 519 + /// [dashmap-iter]: <https://docs.rs/dashmap/*/dashmap/struct.DashMap.html#method.iter> 520 + /// 521 + /// # Examples 522 + /// 523 + /// ```rust 524 + /// use mini_moka::sync::Cache; 525 + /// 526 + /// let cache = Cache::new(100); 527 + /// cache.insert("Julia", 14); 528 + /// 529 + /// let mut iter = cache.iter(); 530 + /// let entry_ref = iter.next().unwrap(); 531 + /// assert_eq!(entry_ref.pair(), (&"Julia", &14)); 532 + /// assert_eq!(entry_ref.key(), &"Julia"); 533 + /// assert_eq!(entry_ref.value(), &14); 534 + /// assert_eq!(*entry_ref, 14); 535 + /// 536 + /// assert!(iter.next().is_none()); 537 + /// ``` 538 + /// 539 + pub fn iter(&self) -> Iter<'_, K, V, S> { 540 + self.base.iter() 541 + } 542 + } 543 + 544 + impl<K, V, S> ConcurrentCacheExt<K, V> for Cache<K, V, S> 545 + where 546 + K: Hash + Eq + Send + Sync + 'static, 547 + V: Send + Sync + 'static, 548 + S: BuildHasher + Clone + Send + Sync + 'static, 549 + { 550 + fn sync(&self) { 551 + self.base.inner.sync(MAX_SYNC_REPEATS); 552 + } 553 + } 554 + 555 + impl<'a, K, V, S> IntoIterator for &'a Cache<K, V, S> 556 + where 557 + K: 'a + Eq + Hash, 558 + V: 'a, 559 + S: BuildHasher + Clone, 560 + { 561 + type Item = EntryRef<'a, K, V>; 562 + 563 + type IntoIter = Iter<'a, K, V, S>; 564 + 565 + fn into_iter(self) -> Self::IntoIter { 566 + self.iter() 567 + } 568 + } 569 + 570 + // private methods 571 + impl<K, V, S> Cache<K, V, S> 572 + where 573 + K: Hash + Eq + Send + Sync + 'static, 574 + V: Clone + Send + Sync + 'static, 575 + S: BuildHasher + Clone + Send + Sync + 'static, 576 + { 577 + #[inline] 578 + fn schedule_write_op( 579 + inner: &impl InnerSync, 580 + ch: &Sender<WriteOp<K, V>>, 581 + op: WriteOp<K, V>, 582 + now: Instant, 583 + housekeeper: Option<&Arc<Housekeeper>>, 584 + ) -> Result<(), TrySendError<WriteOp<K, V>>> { 585 + let mut op = op; 586 + 587 + // NOTES: 588 + // - This will block when the channel is full. 589 + // - We are doing a busy-loop here. We were originally calling `ch.send(op)?`, 590 + // but we got a notable performance degradation. 591 + loop { 592 + BaseCache::<K, V, S>::apply_reads_writes_if_needed(inner, ch, now, housekeeper); 593 + match ch.try_send(op) { 594 + Ok(()) => break, 595 + Err(TrySendError::Full(op1)) => { 596 + op = op1; 597 + std::thread::sleep(Duration::from_micros(WRITE_RETRY_INTERVAL_MICROS)); 598 + } 599 + Err(e @ TrySendError::Disconnected(_)) => return Err(e), 600 + } 601 + } 602 + Ok(()) 603 + } 604 + } 605 + 606 + // For unit tests. 607 + #[cfg(test)] 608 + impl<K, V, S> Cache<K, V, S> 609 + where 610 + K: Hash + Eq + Send + Sync + 'static, 611 + V: Clone + Send + Sync + 'static, 612 + S: BuildHasher + Clone + Send + Sync + 'static, 613 + { 614 + pub(crate) fn is_table_empty(&self) -> bool { 615 + self.entry_count() == 0 616 + } 617 + 618 + pub(crate) fn reconfigure_for_testing(&mut self) { 619 + self.base.reconfigure_for_testing(); 620 + } 621 + 622 + pub(crate) fn set_expiration_clock(&self, clock: Option<crate::common::time::Clock>) { 623 + self.base.set_expiration_clock(clock); 624 + } 625 + } 626 + 627 + // To see the debug prints, run test as `cargo test -- --nocapture` 628 + #[cfg(test)] 629 + mod tests { 630 + use super::{Cache, ConcurrentCacheExt}; 631 + use crate::common::time::Clock; 632 + 633 + use std::{sync::Arc, time::Duration}; 634 + 635 + #[test] 636 + fn basic_single_thread() { 637 + let mut cache = Cache::new(3); 638 + cache.reconfigure_for_testing(); 639 + 640 + // Make the cache exterior immutable. 641 + let cache = cache; 642 + 643 + cache.insert("a", "alice"); 644 + cache.insert("b", "bob"); 645 + assert_eq!(cache.get(&"a"), Some("alice")); 646 + assert!(cache.contains_key(&"a")); 647 + assert!(cache.contains_key(&"b")); 648 + assert_eq!(cache.get(&"b"), Some("bob")); 649 + cache.sync(); 650 + // counts: a -> 1, b -> 1 651 + 652 + cache.insert("c", "cindy"); 653 + assert_eq!(cache.get(&"c"), Some("cindy")); 654 + assert!(cache.contains_key(&"c")); 655 + // counts: a -> 1, b -> 1, c -> 1 656 + cache.sync(); 657 + 658 + assert!(cache.contains_key(&"a")); 659 + assert_eq!(cache.get(&"a"), Some("alice")); 660 + assert_eq!(cache.get(&"b"), Some("bob")); 661 + assert!(cache.contains_key(&"b")); 662 + cache.sync(); 663 + // counts: a -> 2, b -> 2, c -> 1 664 + 665 + // "d" should not be admitted because its frequency is too low. 666 + cache.insert("d", "david"); // count: d -> 0 667 + cache.sync(); 668 + assert_eq!(cache.get(&"d"), None); // d -> 1 669 + assert!(!cache.contains_key(&"d")); 670 + 671 + cache.insert("d", "david"); 672 + cache.sync(); 673 + assert!(!cache.contains_key(&"d")); 674 + assert_eq!(cache.get(&"d"), None); // d -> 2 675 + 676 + // "d" should be admitted and "c" should be evicted 677 + // because d's frequency is higher than c's. 678 + cache.insert("d", "dennis"); 679 + cache.sync(); 680 + assert_eq!(cache.get(&"a"), Some("alice")); 681 + assert_eq!(cache.get(&"b"), Some("bob")); 682 + assert_eq!(cache.get(&"c"), None); 683 + assert_eq!(cache.get(&"d"), Some("dennis")); 684 + assert!(cache.contains_key(&"a")); 685 + assert!(cache.contains_key(&"b")); 686 + assert!(!cache.contains_key(&"c")); 687 + assert!(cache.contains_key(&"d")); 688 + 689 + cache.invalidate(&"b"); 690 + assert_eq!(cache.get(&"b"), None); 691 + assert!(!cache.contains_key(&"b")); 692 + } 693 + 694 + #[test] 695 + fn size_aware_eviction() { 696 + let weigher = |_k: &&str, v: &(&str, u32)| v.1; 697 + 698 + let alice = ("alice", 10); 699 + let bob = ("bob", 15); 700 + let bill = ("bill", 20); 701 + let cindy = ("cindy", 5); 702 + let david = ("david", 15); 703 + let dennis = ("dennis", 15); 704 + 705 + let mut cache = Cache::builder().max_capacity(31).weigher(weigher).build(); 706 + cache.reconfigure_for_testing(); 707 + 708 + // Make the cache exterior immutable. 709 + let cache = cache; 710 + 711 + cache.insert("a", alice); 712 + cache.insert("b", bob); 713 + assert_eq!(cache.get(&"a"), Some(alice)); 714 + assert!(cache.contains_key(&"a")); 715 + assert!(cache.contains_key(&"b")); 716 + assert_eq!(cache.get(&"b"), Some(bob)); 717 + cache.sync(); 718 + // order (LRU -> MRU) and counts: a -> 1, b -> 1 719 + 720 + cache.insert("c", cindy); 721 + assert_eq!(cache.get(&"c"), Some(cindy)); 722 + assert!(cache.contains_key(&"c")); 723 + // order and counts: a -> 1, b -> 1, c -> 1 724 + cache.sync(); 725 + 726 + assert!(cache.contains_key(&"a")); 727 + assert_eq!(cache.get(&"a"), Some(alice)); 728 + assert_eq!(cache.get(&"b"), Some(bob)); 729 + assert!(cache.contains_key(&"b")); 730 + cache.sync(); 731 + // order and counts: c -> 1, a -> 2, b -> 2 732 + 733 + // To enter "d" (weight: 15), it needs to evict "c" (w: 5) and "a" (w: 10). 734 + // "d" must have higher count than 3, which is the aggregated count 735 + // of "a" and "c". 736 + cache.insert("d", david); // count: d -> 0 737 + cache.sync(); 738 + assert_eq!(cache.get(&"d"), None); // d -> 1 739 + assert!(!cache.contains_key(&"d")); 740 + 741 + cache.insert("d", david); 742 + cache.sync(); 743 + assert!(!cache.contains_key(&"d")); 744 + assert_eq!(cache.get(&"d"), None); // d -> 2 745 + 746 + cache.insert("d", david); 747 + cache.sync(); 748 + assert_eq!(cache.get(&"d"), None); // d -> 3 749 + assert!(!cache.contains_key(&"d")); 750 + 751 + cache.insert("d", david); 752 + cache.sync(); 753 + assert!(!cache.contains_key(&"d")); 754 + assert_eq!(cache.get(&"d"), None); // d -> 4 755 + 756 + // Finally "d" should be admitted by evicting "c" and "a". 757 + cache.insert("d", dennis); 758 + cache.sync(); 759 + assert_eq!(cache.get(&"a"), None); 760 + assert_eq!(cache.get(&"b"), Some(bob)); 761 + assert_eq!(cache.get(&"c"), None); 762 + assert_eq!(cache.get(&"d"), Some(dennis)); 763 + assert!(!cache.contains_key(&"a")); 764 + assert!(cache.contains_key(&"b")); 765 + assert!(!cache.contains_key(&"c")); 766 + assert!(cache.contains_key(&"d")); 767 + 768 + // Update "b" with "bill" (w: 15 -> 20). This should evict "d" (w: 15). 769 + cache.insert("b", bill); 770 + cache.sync(); 771 + assert_eq!(cache.get(&"b"), Some(bill)); 772 + assert_eq!(cache.get(&"d"), None); 773 + assert!(cache.contains_key(&"b")); 774 + assert!(!cache.contains_key(&"d")); 775 + 776 + // Re-add "a" (w: 10) and update "b" with "bob" (w: 20 -> 15). 777 + cache.insert("a", alice); 778 + cache.insert("b", bob); 779 + cache.sync(); 780 + assert_eq!(cache.get(&"a"), Some(alice)); 781 + assert_eq!(cache.get(&"b"), Some(bob)); 782 + assert_eq!(cache.get(&"d"), None); 783 + assert!(cache.contains_key(&"a")); 784 + assert!(cache.contains_key(&"b")); 785 + assert!(!cache.contains_key(&"d")); 786 + 787 + // Verify the sizes. 788 + assert_eq!(cache.entry_count(), 2); 789 + assert_eq!(cache.weighted_size(), 25); 790 + } 791 + 792 + #[test] 793 + fn basic_multi_threads() { 794 + let num_threads = 4; 795 + let cache = Cache::new(100); 796 + 797 + // https://rust-lang.github.io/rust-clippy/master/index.html#needless_collect 798 + #[allow(clippy::needless_collect)] 799 + let handles = (0..num_threads) 800 + .map(|id| { 801 + let cache = cache.clone(); 802 + std::thread::spawn(move || { 803 + cache.insert(10, format!("{}-100", id)); 804 + cache.get(&10); 805 + cache.insert(20, format!("{}-200", id)); 806 + cache.invalidate(&10); 807 + }) 808 + }) 809 + .collect::<Vec<_>>(); 810 + 811 + handles.into_iter().for_each(|h| h.join().expect("Failed")); 812 + 813 + assert!(cache.get(&10).is_none()); 814 + assert!(cache.get(&20).is_some()); 815 + assert!(!cache.contains_key(&10)); 816 + assert!(cache.contains_key(&20)); 817 + } 818 + 819 + #[test] 820 + fn invalidate_all() { 821 + let mut cache = Cache::new(100); 822 + cache.reconfigure_for_testing(); 823 + 824 + // Make the cache exterior immutable. 825 + let cache = cache; 826 + 827 + cache.insert("a", "alice"); 828 + cache.insert("b", "bob"); 829 + cache.insert("c", "cindy"); 830 + assert_eq!(cache.get(&"a"), Some("alice")); 831 + assert_eq!(cache.get(&"b"), Some("bob")); 832 + assert_eq!(cache.get(&"c"), Some("cindy")); 833 + assert!(cache.contains_key(&"a")); 834 + assert!(cache.contains_key(&"b")); 835 + assert!(cache.contains_key(&"c")); 836 + 837 + // `cache.sync()` is no longer needed here before invalidating. The last 838 + // modified timestamp of the entries were updated when they were inserted. 839 + // https://github.com/moka-rs/moka/issues/155 840 + 841 + cache.invalidate_all(); 842 + cache.sync(); 843 + 844 + cache.insert("d", "david"); 845 + cache.sync(); 846 + 847 + assert!(cache.get(&"a").is_none()); 848 + assert!(cache.get(&"b").is_none()); 849 + assert!(cache.get(&"c").is_none()); 850 + assert_eq!(cache.get(&"d"), Some("david")); 851 + assert!(!cache.contains_key(&"a")); 852 + assert!(!cache.contains_key(&"b")); 853 + assert!(!cache.contains_key(&"c")); 854 + assert!(cache.contains_key(&"d")); 855 + } 856 + 857 + #[test] 858 + fn time_to_live() { 859 + let mut cache = Cache::builder() 860 + .max_capacity(100) 861 + .time_to_live(Duration::from_secs(10)) 862 + .build(); 863 + 864 + cache.reconfigure_for_testing(); 865 + 866 + let (clock, mock) = Clock::mock(); 867 + cache.set_expiration_clock(Some(clock)); 868 + 869 + // Make the cache exterior immutable. 870 + let cache = cache; 871 + 872 + cache.insert("a", "alice"); 873 + cache.sync(); 874 + 875 + mock.increment(Duration::from_secs(5)); // 5 secs from the start. 876 + cache.sync(); 877 + 878 + assert_eq!(cache.get(&"a"), Some("alice")); 879 + assert!(cache.contains_key(&"a")); 880 + 881 + mock.increment(Duration::from_secs(5)); // 10 secs. 882 + assert_eq!(cache.get(&"a"), None); 883 + assert!(!cache.contains_key(&"a")); 884 + 885 + assert_eq!(cache.iter().count(), 0); 886 + 887 + cache.sync(); 888 + assert!(cache.is_table_empty()); 889 + 890 + cache.insert("b", "bob"); 891 + cache.sync(); 892 + 893 + assert_eq!(cache.entry_count(), 1); 894 + 895 + mock.increment(Duration::from_secs(5)); // 15 secs. 896 + cache.sync(); 897 + 898 + assert_eq!(cache.get(&"b"), Some("bob")); 899 + assert!(cache.contains_key(&"b")); 900 + assert_eq!(cache.entry_count(), 1); 901 + 902 + cache.insert("b", "bill"); 903 + cache.sync(); 904 + 905 + mock.increment(Duration::from_secs(5)); // 20 secs 906 + cache.sync(); 907 + 908 + assert_eq!(cache.get(&"b"), Some("bill")); 909 + assert!(cache.contains_key(&"b")); 910 + assert_eq!(cache.entry_count(), 1); 911 + 912 + mock.increment(Duration::from_secs(5)); // 25 secs 913 + assert_eq!(cache.get(&"a"), None); 914 + assert_eq!(cache.get(&"b"), None); 915 + assert!(!cache.contains_key(&"a")); 916 + assert!(!cache.contains_key(&"b")); 917 + 918 + assert_eq!(cache.iter().count(), 0); 919 + 920 + cache.sync(); 921 + assert!(cache.is_table_empty()); 922 + } 923 + 924 + #[test] 925 + fn time_to_idle() { 926 + let mut cache = Cache::builder() 927 + .max_capacity(100) 928 + .time_to_idle(Duration::from_secs(10)) 929 + .build(); 930 + 931 + cache.reconfigure_for_testing(); 932 + 933 + let (clock, mock) = Clock::mock(); 934 + cache.set_expiration_clock(Some(clock)); 935 + 936 + // Make the cache exterior immutable. 937 + let cache = cache; 938 + 939 + cache.insert("a", "alice"); 940 + cache.sync(); 941 + 942 + mock.increment(Duration::from_secs(5)); // 5 secs from the start. 943 + cache.sync(); 944 + 945 + assert_eq!(cache.get(&"a"), Some("alice")); 946 + 947 + mock.increment(Duration::from_secs(5)); // 10 secs. 948 + cache.sync(); 949 + 950 + cache.insert("b", "bob"); 951 + cache.sync(); 952 + 953 + assert_eq!(cache.entry_count(), 2); 954 + 955 + mock.increment(Duration::from_secs(2)); // 12 secs. 956 + cache.sync(); 957 + 958 + // contains_key does not reset the idle timer for the key. 959 + assert!(cache.contains_key(&"a")); 960 + assert!(cache.contains_key(&"b")); 961 + cache.sync(); 962 + 963 + assert_eq!(cache.entry_count(), 2); 964 + 965 + mock.increment(Duration::from_secs(3)); // 15 secs. 966 + assert_eq!(cache.get(&"a"), None); 967 + assert_eq!(cache.get(&"b"), Some("bob")); 968 + assert!(!cache.contains_key(&"a")); 969 + assert!(cache.contains_key(&"b")); 970 + 971 + assert_eq!(cache.iter().count(), 1); 972 + 973 + cache.sync(); 974 + assert_eq!(cache.entry_count(), 1); 975 + 976 + mock.increment(Duration::from_secs(10)); // 25 secs 977 + assert_eq!(cache.get(&"a"), None); 978 + assert_eq!(cache.get(&"b"), None); 979 + assert!(!cache.contains_key(&"a")); 980 + assert!(!cache.contains_key(&"b")); 981 + 982 + assert_eq!(cache.iter().count(), 0); 983 + 984 + cache.sync(); 985 + assert!(cache.is_table_empty()); 986 + } 987 + 988 + #[test] 989 + fn test_iter() { 990 + const NUM_KEYS: usize = 50; 991 + 992 + fn make_value(key: usize) -> String { 993 + format!("val: {}", key) 994 + } 995 + 996 + let cache = Cache::builder() 997 + .max_capacity(100) 998 + .time_to_idle(Duration::from_secs(10)) 999 + .build(); 1000 + 1001 + for key in 0..NUM_KEYS { 1002 + cache.insert(key, make_value(key)); 1003 + } 1004 + 1005 + let mut key_set = std::collections::HashSet::new(); 1006 + 1007 + for entry in &cache { 1008 + let (key, value) = entry.pair(); 1009 + assert_eq!(value, &make_value(*key)); 1010 + 1011 + key_set.insert(*key); 1012 + } 1013 + 1014 + // Ensure there are no missing or duplicate keys in the iteration. 1015 + assert_eq!(key_set.len(), NUM_KEYS); 1016 + 1017 + // DO NOT REMOVE THE COMMENT FROM THIS BLOCK. 1018 + // This block demonstrates how you can write a code to get a deadlock. 1019 + // { 1020 + // let mut iter = cache.iter(); 1021 + // let _ = iter.next(); 1022 + 1023 + // for key in 0..NUM_KEYS { 1024 + // cache.insert(key, make_value(key)); 1025 + // println!("{}", key); 1026 + // } 1027 + 1028 + // let _ = iter.next(); 1029 + // } 1030 + } 1031 + 1032 + /// Runs 16 threads at the same time and ensures no deadlock occurs. 1033 + /// 1034 + /// - Eight of the threads will update key-values in the cache. 1035 + /// - Eight others will iterate the cache. 1036 + /// 1037 + #[test] 1038 + fn test_iter_multi_threads() { 1039 + use std::collections::HashSet; 1040 + 1041 + const NUM_KEYS: usize = 1024; 1042 + const NUM_THREADS: usize = 16; 1043 + 1044 + fn make_value(key: usize) -> String { 1045 + format!("val: {}", key) 1046 + } 1047 + 1048 + let cache = Cache::builder() 1049 + .max_capacity(2048) 1050 + .time_to_idle(Duration::from_secs(10)) 1051 + .build(); 1052 + 1053 + // Initialize the cache. 1054 + for key in 0..NUM_KEYS { 1055 + cache.insert(key, make_value(key)); 1056 + } 1057 + 1058 + let rw_lock = Arc::new(std::sync::RwLock::<()>::default()); 1059 + let write_lock = rw_lock.write().unwrap(); 1060 + 1061 + // https://rust-lang.github.io/rust-clippy/master/index.html#needless_collect 1062 + #[allow(clippy::needless_collect)] 1063 + let handles = (0..NUM_THREADS) 1064 + .map(|n| { 1065 + let cache = cache.clone(); 1066 + let rw_lock = Arc::clone(&rw_lock); 1067 + 1068 + if n % 2 == 0 { 1069 + // This thread will update the cache. 1070 + std::thread::spawn(move || { 1071 + let read_lock = rw_lock.read().unwrap(); 1072 + for key in 0..NUM_KEYS { 1073 + // TODO: Update keys in a random order? 1074 + cache.insert(key, make_value(key)); 1075 + } 1076 + std::mem::drop(read_lock); 1077 + }) 1078 + } else { 1079 + // This thread will iterate the cache. 1080 + std::thread::spawn(move || { 1081 + let read_lock = rw_lock.read().unwrap(); 1082 + let mut key_set = HashSet::new(); 1083 + for entry in &cache { 1084 + let (key, value) = entry.pair(); 1085 + assert_eq!(value, &make_value(*key)); 1086 + key_set.insert(*key); 1087 + } 1088 + // Ensure there are no missing or duplicate keys in the iteration. 1089 + assert_eq!(key_set.len(), NUM_KEYS); 1090 + std::mem::drop(read_lock); 1091 + }) 1092 + } 1093 + }) 1094 + .collect::<Vec<_>>(); 1095 + 1096 + // Let these threads to run by releasing the write lock. 1097 + std::mem::drop(write_lock); 1098 + 1099 + handles.into_iter().for_each(|h| h.join().expect("Failed")); 1100 + 1101 + // Ensure there are no missing or duplicate keys in the iteration. 1102 + let key_set = cache.iter().map(|ent| *ent.key()).collect::<HashSet<_>>(); 1103 + assert_eq!(key_set.len(), NUM_KEYS); 1104 + } 1105 + 1106 + #[test] 1107 + fn test_debug_format() { 1108 + let cache = Cache::new(10); 1109 + cache.insert('a', "alice"); 1110 + cache.insert('b', "bob"); 1111 + cache.insert('c', "cindy"); 1112 + 1113 + let debug_str = format!("{:?}", cache); 1114 + assert!(debug_str.starts_with('{')); 1115 + assert!(debug_str.contains(r#"'a': "alice""#)); 1116 + assert!(debug_str.contains(r#"'b': "bob""#)); 1117 + assert!(debug_str.contains(r#"'c': "cindy""#)); 1118 + assert!(debug_str.ends_with('}')); 1119 + } 1120 + }

+64

crates/mini-moka-vendored/src/sync/iter.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use super::{base_cache::BaseCache, mapref::EntryRef}; 2 + use crate::common::concurrent::ValueEntry; 3 + 4 + use std::{ 5 + hash::{BuildHasher, Hash}, 6 + sync::Arc, 7 + }; 8 + use triomphe::Arc as TrioArc; 9 + 10 + pub(crate) type DashMapIter<'a, K, V, S> = 11 + dashmap::iter::Iter<'a, Arc<K>, TrioArc<ValueEntry<K, V>>, S>; 12 + 13 + pub struct Iter<'a, K, V, S> { 14 + cache: &'a BaseCache<K, V, S>, 15 + map_iter: DashMapIter<'a, K, V, S>, 16 + } 17 + 18 + impl<'a, K, V, S> Iter<'a, K, V, S> { 19 + pub(crate) fn new(cache: &'a BaseCache<K, V, S>, map_iter: DashMapIter<'a, K, V, S>) -> Self { 20 + Self { cache, map_iter } 21 + } 22 + } 23 + 24 + impl<'a, K, V, S> Iterator for Iter<'a, K, V, S> 25 + where 26 + K: Eq + Hash, 27 + S: BuildHasher + Clone, 28 + { 29 + type Item = EntryRef<'a, K, V>; 30 + 31 + fn next(&mut self) -> Option<Self::Item> { 32 + for map_ref in &mut self.map_iter { 33 + if !self.cache.is_expired_entry(map_ref.value()) { 34 + return Some(EntryRef::new(map_ref)); 35 + } 36 + } 37 + 38 + None 39 + } 40 + } 41 + 42 + // Clippy beta 0.1.83 (f41c7ed9889 2024-10-31) warns about unused lifetimes on 'a. 43 + // This seems a false positive. The lifetimes are used in the trait bounds. 44 + // https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes 45 + #[allow(clippy::extra_unused_lifetimes)] 46 + unsafe impl<'a, K, V, S> Send for Iter<'_, K, V, S> 47 + where 48 + K: 'a + Eq + Hash + Send, 49 + V: 'a + Send, 50 + S: 'a + BuildHasher + Clone, 51 + { 52 + } 53 + 54 + // Clippy beta 0.1.83 (f41c7ed9889 2024-10-31) warns about unused lifetimes on 'a. 55 + // This seems a false positive. The lifetimes are used in the trait bounds. 56 + // https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes 57 + #[allow(clippy::extra_unused_lifetimes)] 58 + unsafe impl<'a, K, V, S> Sync for Iter<'_, K, V, S> 59 + where 60 + K: 'a + Eq + Hash + Sync, 61 + V: 'a + Sync, 62 + S: 'a + BuildHasher + Clone, 63 + { 64 + }

+48

crates/mini-moka-vendored/src/sync/mapref.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use crate::common::concurrent::ValueEntry; 2 + 3 + use std::{hash::Hash, sync::Arc}; 4 + use triomphe::Arc as TrioArc; 5 + 6 + type DashMapRef<'a, K, V> = 7 + dashmap::mapref::multiple::RefMulti<'a, Arc<K>, TrioArc<ValueEntry<K, V>>>; 8 + 9 + pub struct EntryRef<'a, K, V>(DashMapRef<'a, K, V>); 10 + 11 + unsafe impl<K, V> Sync for EntryRef<'_, K, V> 12 + where 13 + K: Eq + Hash + Send + Sync, 14 + V: Send + Sync, 15 + { 16 + } 17 + 18 + impl<'a, K, V> EntryRef<'a, K, V> 19 + where 20 + K: Eq + Hash, 21 + { 22 + pub(crate) fn new(map_ref: DashMapRef<'a, K, V>) -> Self { 23 + Self(map_ref) 24 + } 25 + 26 + pub fn key(&self) -> &K { 27 + self.0.key() 28 + } 29 + 30 + pub fn value(&self) -> &V { 31 + &self.0.value().value 32 + } 33 + 34 + pub fn pair(&self) -> (&K, &V) { 35 + (self.key(), self.value()) 36 + } 37 + } 38 + 39 + impl<K, V> std::ops::Deref for EntryRef<'_, K, V> 40 + where 41 + K: Eq + Hash, 42 + { 43 + type Target = V; 44 + 45 + fn deref(&self) -> &V { 46 + self.value() 47 + } 48 + }

+202

crates/mini-moka-vendored/src/unsync.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + //! Provides a *not* thread-safe cache implementation built upon 2 + //! [`std::collections::HashMap`][std-hashmap]. 3 + //! 4 + //! [std-hashmap]: https://doc.rust-lang.org/std/collections/struct.HashMap.html 5 + 6 + mod builder; 7 + mod cache; 8 + mod deques; 9 + mod iter; 10 + 11 + use std::{ptr::NonNull, rc::Rc}; 12 + use tagptr::TagNonNull; 13 + 14 + pub use builder::CacheBuilder; 15 + pub use cache::Cache; 16 + pub use iter::Iter; 17 + 18 + use crate::common::{deque::DeqNode, time::Instant}; 19 + 20 + pub(crate) type Weigher<K, V> = Box<dyn FnMut(&K, &V) -> u32>; 21 + 22 + pub(crate) trait AccessTime { 23 + fn last_accessed(&self) -> Option<Instant>; 24 + fn set_last_accessed(&mut self, timestamp: Instant); 25 + fn last_modified(&self) -> Option<Instant>; 26 + fn set_last_modified(&mut self, timestamp: Instant); 27 + } 28 + 29 + pub(crate) struct KeyDate<K> { 30 + pub(crate) key: Rc<K>, 31 + pub(crate) timestamp: Option<Instant>, 32 + } 33 + 34 + impl<K> KeyDate<K> { 35 + pub(crate) fn new(key: Rc<K>, timestamp: Option<Instant>) -> Self { 36 + Self { key, timestamp } 37 + } 38 + } 39 + 40 + pub(crate) struct KeyHashDate<K> { 41 + pub(crate) key: Rc<K>, 42 + pub(crate) hash: u64, 43 + pub(crate) timestamp: Option<Instant>, 44 + } 45 + 46 + impl<K> KeyHashDate<K> { 47 + pub(crate) fn new(key: Rc<K>, hash: u64, timestamp: Option<Instant>) -> Self { 48 + Self { 49 + key, 50 + hash, 51 + timestamp, 52 + } 53 + } 54 + } 55 + 56 + // DeqNode for an access order queue. 57 + type KeyDeqNodeAo<K> = TagNonNull<DeqNode<KeyHashDate<K>>, 2>; 58 + 59 + // DeqNode for the write order queue. 60 + type KeyDeqNodeWo<K> = NonNull<DeqNode<KeyDate<K>>>; 61 + 62 + struct EntryInfo<K> { 63 + access_order_q_node: Option<KeyDeqNodeAo<K>>, 64 + write_order_q_node: Option<KeyDeqNodeWo<K>>, 65 + policy_weight: u32, 66 + } 67 + 68 + pub(crate) struct ValueEntry<K, V> { 69 + pub(crate) value: V, 70 + info: EntryInfo<K>, 71 + } 72 + 73 + impl<K, V> ValueEntry<K, V> { 74 + pub(crate) fn new(value: V, policy_weight: u32) -> Self { 75 + Self { 76 + value, 77 + info: EntryInfo { 78 + access_order_q_node: None, 79 + write_order_q_node: None, 80 + policy_weight, 81 + }, 82 + } 83 + } 84 + 85 + #[inline] 86 + pub(crate) fn replace_deq_nodes_with(&mut self, mut other: Self) { 87 + self.info.access_order_q_node = other.info.access_order_q_node.take(); 88 + self.info.write_order_q_node = other.info.write_order_q_node.take(); 89 + } 90 + 91 + #[inline] 92 + pub(crate) fn access_order_q_node(&self) -> Option<KeyDeqNodeAo<K>> { 93 + self.info.access_order_q_node 94 + } 95 + 96 + #[inline] 97 + pub(crate) fn set_access_order_q_node(&mut self, node: Option<KeyDeqNodeAo<K>>) { 98 + self.info.access_order_q_node = node; 99 + } 100 + 101 + #[inline] 102 + pub(crate) fn take_access_order_q_node(&mut self) -> Option<KeyDeqNodeAo<K>> { 103 + self.info.access_order_q_node.take() 104 + } 105 + 106 + #[inline] 107 + pub(crate) fn write_order_q_node(&self) -> Option<KeyDeqNodeWo<K>> { 108 + self.info.write_order_q_node 109 + } 110 + 111 + #[inline] 112 + pub(crate) fn set_write_order_q_node(&mut self, node: Option<KeyDeqNodeWo<K>>) { 113 + self.info.write_order_q_node = node; 114 + } 115 + 116 + #[inline] 117 + pub(crate) fn take_write_order_q_node(&mut self) -> Option<KeyDeqNodeWo<K>> { 118 + self.info.write_order_q_node.take() 119 + } 120 + 121 + #[inline] 122 + pub(crate) fn policy_weight(&self) -> u32 { 123 + self.info.policy_weight 124 + } 125 + 126 + #[inline] 127 + pub(crate) fn set_policy_weight(&mut self, policy_weight: u32) { 128 + self.info.policy_weight = policy_weight; 129 + } 130 + } 131 + 132 + impl<K, V> AccessTime for ValueEntry<K, V> { 133 + #[inline] 134 + fn last_accessed(&self) -> Option<Instant> { 135 + self.access_order_q_node() 136 + .and_then(|node| unsafe { node.as_ref() }.element.timestamp) 137 + } 138 + 139 + #[inline] 140 + fn set_last_accessed(&mut self, timestamp: Instant) { 141 + if let Some(mut node) = self.info.access_order_q_node { 142 + unsafe { node.as_mut() }.set_last_accessed(timestamp); 143 + } 144 + } 145 + 146 + #[inline] 147 + fn last_modified(&self) -> Option<Instant> { 148 + self.write_order_q_node() 149 + .and_then(|node| unsafe { node.as_ref() }.element.timestamp) 150 + } 151 + 152 + #[inline] 153 + fn set_last_modified(&mut self, timestamp: Instant) { 154 + if let Some(mut node) = self.info.write_order_q_node { 155 + unsafe { node.as_mut() }.set_last_modified(timestamp); 156 + } 157 + } 158 + } 159 + 160 + impl<K> AccessTime for DeqNode<KeyDate<K>> { 161 + #[inline] 162 + fn last_accessed(&self) -> Option<Instant> { 163 + None 164 + } 165 + 166 + #[inline] 167 + fn set_last_accessed(&mut self, _timestamp: Instant) { 168 + unreachable!(); 169 + } 170 + 171 + #[inline] 172 + fn last_modified(&self) -> Option<Instant> { 173 + self.element.timestamp 174 + } 175 + 176 + #[inline] 177 + fn set_last_modified(&mut self, timestamp: Instant) { 178 + self.element.timestamp = Some(timestamp); 179 + } 180 + } 181 + 182 + impl<K> AccessTime for DeqNode<KeyHashDate<K>> { 183 + #[inline] 184 + fn last_accessed(&self) -> Option<Instant> { 185 + self.element.timestamp 186 + } 187 + 188 + #[inline] 189 + fn set_last_accessed(&mut self, timestamp: Instant) { 190 + self.element.timestamp = Some(timestamp); 191 + } 192 + 193 + #[inline] 194 + fn last_modified(&self) -> Option<Instant> { 195 + None 196 + } 197 + 198 + #[inline] 199 + fn set_last_modified(&mut self, _timestamp: Instant) { 200 + unreachable!(); 201 + } 202 + }

+243

crates/mini-moka-vendored/src/unsync/builder.rs

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··· 1 + use super::{Cache, Weigher}; 2 + use crate::common::builder_utils; 3 + 4 + use std::{ 5 + collections::hash_map::RandomState, 6 + hash::{BuildHasher, Hash}, 7 + marker::PhantomData, 8 + time::Duration, 9 + }; 10 + 11 + /// Builds a [`Cache`][cache-struct] with various configuration knobs. 12 + /// 13 + /// [cache-struct]: ./struct.Cache.html 14 + /// 15 + /// # Examples 16 + /// 17 + /// ```rust 18 + /// use mini_moka::unsync::Cache; 19 + /// use std::time::Duration; 20 + /// 21 + /// let mut cache = Cache::builder() 22 + /// // Max 10,000 elements 23 + /// .max_capacity(10_000) 24 + /// // Time to live (TTL): 30 minutes 25 + /// .time_to_live(Duration::from_secs(30 * 60)) 26 + /// // Time to idle (TTI): 5 minutes 27 + /// .time_to_idle(Duration::from_secs( 5 * 60)) 28 + /// // Create the cache. 29 + /// .build(); 30 + /// 31 + /// // This entry will expire after 5 minutes (TTI) if there is no get(). 32 + /// cache.insert(0, "zero"); 33 + /// 34 + /// // This get() will extend the entry life for another 5 minutes. 35 + /// cache.get(&0); 36 + /// 37 + /// // Even though we keep calling get(), the entry will expire 38 + /// // after 30 minutes (TTL) from the insert(). 39 + /// ``` 40 + /// 41 + #[must_use] 42 + pub struct CacheBuilder<K, V, C> { 43 + max_capacity: Option<u64>, 44 + initial_capacity: Option<usize>, 45 + weigher: Option<Weigher<K, V>>, 46 + time_to_live: Option<Duration>, 47 + time_to_idle: Option<Duration>, 48 + cache_type: PhantomData<C>, 49 + } 50 + 51 + impl<K, V> Default for CacheBuilder<K, V, Cache<K, V, RandomState>> 52 + where 53 + K: Eq + Hash, 54 + { 55 + fn default() -> Self { 56 + Self { 57 + max_capacity: None, 58 + initial_capacity: None, 59 + weigher: None, 60 + time_to_live: None, 61 + time_to_idle: None, 62 + cache_type: Default::default(), 63 + } 64 + } 65 + } 66 + 67 + impl<K, V> CacheBuilder<K, V, Cache<K, V, RandomState>> 68 + where 69 + K: Eq + Hash, 70 + { 71 + /// Construct a new `CacheBuilder` that will be used to build a `Cache` holding 72 + /// up to `max_capacity` entries. 73 + pub fn new(max_capacity: u64) -> Self { 74 + Self { 75 + max_capacity: Some(max_capacity), 76 + ..Default::default() 77 + } 78 + } 79 + 80 + /// Builds a `Cache<K, V>`. 81 + /// 82 + /// # Panics 83 + /// 84 + /// Panics if configured with either `time_to_live` or `time_to_idle` higher than 85 + /// 1000 years. This is done to protect against overflow when computing key 86 + /// expiration. 87 + pub fn build(self) -> Cache<K, V, RandomState> { 88 + let build_hasher = RandomState::default(); 89 + builder_utils::ensure_expirations_or_panic(self.time_to_live, self.time_to_idle); 90 + Cache::with_everything( 91 + self.max_capacity, 92 + self.initial_capacity, 93 + build_hasher, 94 + self.weigher, 95 + self.time_to_live, 96 + self.time_to_idle, 97 + ) 98 + } 99 + 100 + /// Builds a `Cache<K, V, S>`, with the given `hasher`. 101 + /// 102 + /// # Panics 103 + /// 104 + /// Panics if configured with either `time_to_live` or `time_to_idle` higher than 105 + /// 1000 years. This is done to protect against overflow when computing key 106 + /// expiration. 107 + pub fn build_with_hasher<S>(self, hasher: S) -> Cache<K, V, S> 108 + where 109 + S: BuildHasher + Clone, 110 + { 111 + builder_utils::ensure_expirations_or_panic(self.time_to_live, self.time_to_idle); 112 + Cache::with_everything( 113 + self.max_capacity, 114 + self.initial_capacity, 115 + hasher, 116 + self.weigher, 117 + self.time_to_live, 118 + self.time_to_idle, 119 + ) 120 + } 121 + } 122 + 123 + impl<K, V, C> CacheBuilder<K, V, C> { 124 + /// Sets the max capacity of the cache. 125 + pub fn max_capacity(self, max_capacity: u64) -> Self { 126 + Self { 127 + max_capacity: Some(max_capacity), 128 + ..self 129 + } 130 + } 131 + 132 + /// Sets the initial capacity (number of entries) of the cache. 133 + pub fn initial_capacity(self, number_of_entries: usize) -> Self { 134 + Self { 135 + initial_capacity: Some(number_of_entries), 136 + ..self 137 + } 138 + } 139 + 140 + /// Sets the weigher closure of the cache. 141 + /// 142 + /// The closure should take `&K` and `&V` as the arguments and returns a `u32` 143 + /// representing the relative size of the entry. 144 + pub fn weigher(self, weigher: impl FnMut(&K, &V) -> u32 + 'static) -> Self { 145 + Self { 146 + weigher: Some(Box::new(weigher)), 147 + ..self 148 + } 149 + } 150 + 151 + /// Sets the time to live of the cache. 152 + /// 153 + /// A cached entry will be expired after the specified duration past from 154 + /// `insert`. 155 + /// 156 + /// # Panics 157 + /// 158 + /// `CacheBuilder::build*` methods will panic if the given `duration` is longer 159 + /// than 1000 years. This is done to protect against overflow when computing key 160 + /// expiration. 161 + pub fn time_to_live(self, duration: Duration) -> Self { 162 + Self { 163 + time_to_live: Some(duration), 164 + ..self 165 + } 166 + } 167 + 168 + /// Sets the time to idle of the cache. 169 + /// 170 + /// A cached entry will be expired after the specified duration past from `get` 171 + /// or `insert`. 172 + /// 173 + /// # Panics 174 + /// 175 + /// `CacheBuilder::build*` methods will panic if the given `duration` is longer 176 + /// than 1000 years. This is done to protect against overflow when computing key 177 + /// expiration. 178 + pub fn time_to_idle(self, duration: Duration) -> Self { 179 + Self { 180 + time_to_idle: Some(duration), 181 + ..self 182 + } 183 + } 184 + } 185 + 186 + #[cfg(test)] 187 + mod tests { 188 + use super::CacheBuilder; 189 + use std::time::Duration; 190 + use wasm_bindgen_test::wasm_bindgen_test; 191 + 192 + #[test] 193 + #[wasm_bindgen_test] 194 + fn build_cache() { 195 + // Cache<char, String> 196 + let mut cache = CacheBuilder::new(100).build(); 197 + let policy = cache.policy(); 198 + 199 + assert_eq!(policy.max_capacity(), Some(100)); 200 + assert_eq!(policy.time_to_live(), None); 201 + assert_eq!(policy.time_to_idle(), None); 202 + 203 + cache.insert('a', "Alice"); 204 + assert_eq!(cache.get(&'a'), Some(&"Alice")); 205 + 206 + let mut cache = CacheBuilder::new(100) 207 + .time_to_live(Duration::from_secs(45 * 60)) 208 + .time_to_idle(Duration::from_secs(15 * 60)) 209 + .build(); 210 + let policy = cache.policy(); 211 + 212 + assert_eq!(policy.max_capacity(), Some(100)); 213 + assert_eq!(policy.time_to_live(), Some(Duration::from_secs(45 * 60))); 214 + assert_eq!(policy.time_to_idle(), Some(Duration::from_secs(15 * 60))); 215 + 216 + cache.insert('a', "Alice"); 217 + assert_eq!(cache.get(&'a'), Some(&"Alice")); 218 + } 219 + 220 + #[test] 221 + #[wasm_bindgen_test] 222 + #[should_panic(expected = "time_to_live is longer than 1000 years")] 223 + fn build_cache_too_long_ttl() { 224 + let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600; 225 + let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100); 226 + let duration = Duration::from_secs(thousand_years_secs); 227 + builder 228 + .time_to_live(duration + Duration::from_secs(1)) 229 + .build(); 230 + } 231 + 232 + #[test] 233 + #[wasm_bindgen_test] 234 + #[should_panic(expected = "time_to_idle is longer than 1000 years")] 235 + fn build_cache_too_long_tti() { 236 + let thousand_years_secs: u64 = 1000 * 365 * 24 * 3600; 237 + let builder: CacheBuilder<char, String, _> = CacheBuilder::new(100); 238 + let duration = Duration::from_secs(thousand_years_secs); 239 + builder 240 + .time_to_idle(duration + Duration::from_secs(1)) 241 + .build(); 242 + } 243 + }

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crates/mini-moka-vendored/src/unsync/cache.rs

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··· 1 + use super::{ 2 + deques::Deques, AccessTime, CacheBuilder, Iter, KeyDate, KeyHashDate, ValueEntry, Weigher, 3 + }; 4 + use crate::{ 5 + common::{ 6 + self, 7 + deque::{DeqNode, Deque}, 8 + frequency_sketch::FrequencySketch, 9 + time::{CheckedTimeOps, Clock, Instant}, 10 + CacheRegion, 11 + }, 12 + Policy, 13 + }; 14 + 15 + use smallvec::SmallVec; 16 + use std::{ 17 + borrow::Borrow, 18 + collections::{hash_map::RandomState, HashMap}, 19 + fmt, 20 + hash::{BuildHasher, Hash}, 21 + ptr::NonNull, 22 + rc::Rc, 23 + time::Duration, 24 + }; 25 + 26 + const EVICTION_BATCH_SIZE: usize = 100; 27 + 28 + type CacheStore<K, V, S> = std::collections::HashMap<Rc<K>, ValueEntry<K, V>, S>; 29 + 30 + /// An in-memory cache that is _not_ thread-safe. 31 + /// 32 + /// `Cache` utilizes a hash table [`std::collections::HashMap`][std-hashmap] from the 33 + /// standard library for the central key-value storage. `Cache` performs a 34 + /// best-effort bounding of the map using an entry replacement algorithm to determine 35 + /// which entries to evict when the capacity is exceeded. 36 + /// 37 + /// [std-hashmap]: https://doc.rust-lang.org/std/collections/struct.HashMap.html 38 + /// 39 + /// # Characteristic difference between `unsync` and `sync`/`future` caches 40 + /// 41 + /// If you use a cache from a single thread application, `unsync::Cache` may 42 + /// outperform other caches for updates and retrievals because other caches have some 43 + /// overhead on syncing internal data structures between threads. 44 + /// 45 + /// However, other caches may outperform `unsync::Cache` on the same operations when 46 + /// expiration polices are configured on a multi-core system. `unsync::Cache` evicts 47 + /// expired entries as a part of update and retrieval operations while others evict 48 + /// them using a dedicated background thread. 49 + /// 50 + /// # Examples 51 + /// 52 + /// Cache entries are manually added using the insert method, and are stored in the 53 + /// cache until either evicted or manually invalidated. 54 + /// 55 + /// Here's an example of reading and updating a cache by using the main thread: 56 + /// 57 + ///```rust 58 + /// use mini_moka::unsync::Cache; 59 + /// 60 + /// const NUM_KEYS: usize = 64; 61 + /// 62 + /// fn value(n: usize) -> String { 63 + /// format!("value {}", n) 64 + /// } 65 + /// 66 + /// // Create a cache that can store up to 10,000 entries. 67 + /// let mut cache = Cache::new(10_000); 68 + /// 69 + /// // Insert 64 entries. 70 + /// for key in 0..NUM_KEYS { 71 + /// cache.insert(key, value(key)); 72 + /// } 73 + /// 74 + /// // Invalidate every 4 element of the inserted entries. 75 + /// for key in (0..NUM_KEYS).step_by(4) { 76 + /// cache.invalidate(&key); 77 + /// } 78 + /// 79 + /// // Verify the result. 80 + /// for key in 0..NUM_KEYS { 81 + /// if key % 4 == 0 { 82 + /// assert_eq!(cache.get(&key), None); 83 + /// } else { 84 + /// assert_eq!(cache.get(&key), Some(&value(key))); 85 + /// } 86 + /// } 87 + /// ``` 88 + /// 89 + /// # Size-based Eviction 90 + /// 91 + /// ```rust 92 + /// use std::convert::TryInto; 93 + /// use mini_moka::unsync::Cache; 94 + /// 95 + /// // Evict based on the number of entries in the cache. 96 + /// let mut cache = Cache::builder() 97 + /// // Up to 10,000 entries. 98 + /// .max_capacity(10_000) 99 + /// // Create the cache. 100 + /// .build(); 101 + /// cache.insert(1, "one".to_string()); 102 + /// 103 + /// // Evict based on the byte length of strings in the cache. 104 + /// let mut cache = Cache::builder() 105 + /// // A weigher closure takes &K and &V and returns a u32 106 + /// // representing the relative size of the entry. 107 + /// .weigher(|_key, value: &String| -> u32 { 108 + /// value.len().try_into().unwrap_or(u32::MAX) 109 + /// }) 110 + /// // This cache will hold up to 32MiB of values. 111 + /// .max_capacity(32 * 1024 * 1024) 112 + /// .build(); 113 + /// cache.insert(2, "two".to_string()); 114 + /// ``` 115 + /// 116 + /// If your cache should not grow beyond a certain size, use the `max_capacity` 117 + /// method of the [`CacheBuilder`][builder-struct] to set the upper bound. The cache 118 + /// will try to evict entries that have not been used recently or very often. 119 + /// 120 + /// At the cache creation time, a weigher closure can be set by the `weigher` method 121 + /// of the `CacheBuilder`. A weigher closure takes `&K` and `&V` as the arguments and 122 + /// returns a `u32` representing the relative size of the entry: 123 + /// 124 + /// - If the `weigher` is _not_ set, the cache will treat each entry has the same 125 + /// size of `1`. This means the cache will be bounded by the number of entries. 126 + /// - If the `weigher` is set, the cache will call the weigher to calculate the 127 + /// weighted size (relative size) on an entry. This means the cache will be bounded 128 + /// by the total weighted size of entries. 129 + /// 130 + /// Note that weighted sizes are not used when making eviction selections. 131 + /// 132 + /// [builder-struct]: ./struct.CacheBuilder.html 133 + /// 134 + /// # Time-based Expirations 135 + /// 136 + /// `Cache` supports the following expiration policies: 137 + /// 138 + /// - **Time to live**: A cached entry will be expired after the specified duration 139 + /// past from `insert`. 140 + /// - **Time to idle**: A cached entry will be expired after the specified duration 141 + /// past from `get` or `insert`. 142 + /// 143 + /// See the [`CacheBuilder`][builder-struct]'s doc for how to configure a cache 144 + /// with them. 145 + /// 146 + /// [builder-struct]: ./struct.CacheBuilder.html 147 + /// 148 + /// # Hashing Algorithm 149 + /// 150 + /// By default, `Cache` uses a hashing algorithm selected to provide resistance 151 + /// against HashDoS attacks. It will the same one used by 152 + /// `std::collections::HashMap`, which is currently SipHash 1-3. 153 + /// 154 + /// While SipHash's performance is very competitive for medium sized keys, other 155 + /// hashing algorithms will outperform it for small keys such as integers as well as 156 + /// large keys such as long strings. However those algorithms will typically not 157 + /// protect against attacks such as HashDoS. 158 + /// 159 + /// The hashing algorithm can be replaced on a per-`Cache` basis using the 160 + /// [`build_with_hasher`][build-with-hasher-method] method of the 161 + /// `CacheBuilder`. Many alternative algorithms are available on crates.io, such 162 + /// as the [aHash][ahash-crate] crate. 163 + /// 164 + /// [build-with-hasher-method]: ./struct.CacheBuilder.html#method.build_with_hasher 165 + /// [ahash-crate]: https://crates.io/crates/ahash 166 + /// 167 + pub struct Cache<K, V, S = RandomState> { 168 + max_capacity: Option<u64>, 169 + entry_count: u64, 170 + weighted_size: u64, 171 + cache: CacheStore<K, V, S>, 172 + build_hasher: S, 173 + weigher: Option<Weigher<K, V>>, 174 + deques: Deques<K>, 175 + frequency_sketch: FrequencySketch, 176 + frequency_sketch_enabled: bool, 177 + time_to_live: Option<Duration>, 178 + time_to_idle: Option<Duration>, 179 + expiration_clock: Option<Clock>, 180 + } 181 + 182 + impl<K, V, S> fmt::Debug for Cache<K, V, S> 183 + where 184 + K: fmt::Debug + Eq + Hash, 185 + V: fmt::Debug, 186 + // TODO: Remove these bounds from S. 187 + S: BuildHasher + Clone, 188 + { 189 + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { 190 + let mut d_map = f.debug_map(); 191 + 192 + for (k, v) in self.iter() { 193 + d_map.entry(&k, &v); 194 + } 195 + 196 + d_map.finish() 197 + } 198 + } 199 + 200 + impl<K, V> Cache<K, V, RandomState> 201 + where 202 + K: Hash + Eq, 203 + { 204 + /// Constructs a new `Cache<K, V>` that will store up to the `max_capacity` entries. 205 + /// 206 + /// To adjust various configuration knobs such as `initial_capacity` or 207 + /// `time_to_live`, use the [`CacheBuilder`][builder-struct]. 208 + /// 209 + /// [builder-struct]: ./struct.CacheBuilder.html 210 + pub fn new(max_capacity: u64) -> Self { 211 + let build_hasher = RandomState::default(); 212 + Self::with_everything(Some(max_capacity), None, build_hasher, None, None, None) 213 + } 214 + 215 + /// Returns a [`CacheBuilder`][builder-struct], which can builds a `Cache` with 216 + /// various configuration knobs. 217 + /// 218 + /// [builder-struct]: ./struct.CacheBuilder.html 219 + pub fn builder() -> CacheBuilder<K, V, Cache<K, V, RandomState>> { 220 + CacheBuilder::default() 221 + } 222 + } 223 + 224 + // 225 + // public 226 + // 227 + impl<K, V, S> Cache<K, V, S> { 228 + /// Returns a read-only cache policy of this cache. 229 + /// 230 + /// At this time, cache policy cannot be modified after cache creation. 231 + /// A future version may support to modify it. 232 + pub fn policy(&self) -> Policy { 233 + Policy::new(self.max_capacity, self.time_to_live, self.time_to_idle) 234 + } 235 + 236 + /// Returns the number of entries in this cache. 237 + /// 238 + /// # Example 239 + /// 240 + /// ```rust 241 + /// use mini_moka::unsync::Cache; 242 + /// 243 + /// let mut cache = Cache::new(10); 244 + /// cache.insert('n', "Netherland Dwarf"); 245 + /// cache.insert('l', "Lop Eared"); 246 + /// cache.insert('d', "Dutch"); 247 + /// 248 + /// // Ensure an entry exists. 249 + /// assert!(cache.contains_key(&'n')); 250 + /// 251 + /// // Followings will print the actual numbers. 252 + /// println!("{}", cache.entry_count()); // -> 3 253 + /// println!("{}", cache.weighted_size()); // -> 3 254 + /// ``` 255 + /// 256 + pub fn entry_count(&self) -> u64 { 257 + self.entry_count 258 + } 259 + 260 + /// Returns the total weighted size of entries in this cache. 261 + /// 262 + /// See [`entry_count`](#method.entry_count) for a sample code. 263 + pub fn weighted_size(&self) -> u64 { 264 + self.weighted_size 265 + } 266 + } 267 + 268 + impl<K, V, S> Cache<K, V, S> 269 + where 270 + K: Hash + Eq, 271 + S: BuildHasher + Clone, 272 + { 273 + pub(crate) fn with_everything( 274 + max_capacity: Option<u64>, 275 + initial_capacity: Option<usize>, 276 + build_hasher: S, 277 + weigher: Option<Weigher<K, V>>, 278 + time_to_live: Option<Duration>, 279 + time_to_idle: Option<Duration>, 280 + ) -> Self { 281 + let cache = HashMap::with_capacity_and_hasher( 282 + initial_capacity.unwrap_or_default(), 283 + build_hasher.clone(), 284 + ); 285 + 286 + Self { 287 + max_capacity, 288 + entry_count: 0, 289 + weighted_size: 0, 290 + cache, 291 + build_hasher, 292 + weigher, 293 + deques: Default::default(), 294 + frequency_sketch: Default::default(), 295 + frequency_sketch_enabled: false, 296 + time_to_live, 297 + time_to_idle, 298 + expiration_clock: None, 299 + } 300 + } 301 + 302 + /// Returns `true` if the cache contains a value for the key. 303 + /// 304 + /// Unlike the `get` method, this method is not considered a cache read operation, 305 + /// so it does not update the historic popularity estimator or reset the idle 306 + /// timer for the key. 307 + /// 308 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 309 + /// on the borrowed form _must_ match those for the key type. 310 + pub fn contains_key<Q>(&mut self, key: &Q) -> bool 311 + where 312 + Rc<K>: Borrow<Q>, 313 + Q: Hash + Eq + ?Sized, 314 + { 315 + let timestamp = self.evict_expired_if_needed(); 316 + self.evict_lru_entries(); 317 + 318 + match (self.cache.get(key), timestamp) { 319 + // Value not found. 320 + (None, _) => false, 321 + // Value found, no expiry. 322 + (Some(_), None) => true, 323 + // Value found, check if expired. 324 + (Some(entry), Some(ts)) => { 325 + !Self::is_expired_entry_wo(&self.time_to_live, entry, ts) 326 + && !Self::is_expired_entry_ao(&self.time_to_idle, entry, ts) 327 + } 328 + } 329 + } 330 + 331 + /// Returns an immutable reference of the value corresponding to the key. 332 + /// 333 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 334 + /// on the borrowed form _must_ match those for the key type. 335 + pub fn get<Q>(&mut self, key: &Q) -> Option<&V> 336 + where 337 + Rc<K>: Borrow<Q>, 338 + Q: Hash + Eq + ?Sized, 339 + { 340 + let timestamp = self.evict_expired_if_needed(); 341 + self.evict_lru_entries(); 342 + self.frequency_sketch.increment(self.hash(key)); 343 + 344 + match (self.cache.get_mut(key), timestamp, &mut self.deques) { 345 + // Value not found. 346 + (None, _, _) => None, 347 + // Value found, no expiry. 348 + (Some(entry), None, deqs) => { 349 + Self::record_hit(deqs, entry, None); 350 + Some(&entry.value) 351 + } 352 + // Value found, check if expired. 353 + (Some(entry), Some(ts), deqs) => { 354 + if Self::is_expired_entry_wo(&self.time_to_live, entry, ts) 355 + || Self::is_expired_entry_ao(&self.time_to_idle, entry, ts) 356 + { 357 + None 358 + } else { 359 + Self::record_hit(deqs, entry, timestamp); 360 + Some(&entry.value) 361 + } 362 + } 363 + } 364 + } 365 + 366 + pub(crate) fn is_expired_entry(&self, entry: &ValueEntry<K, V>) -> bool { 367 + let now = self.current_time_from_expiration_clock(); 368 + Self::is_expired_entry_wo(&self.time_to_live, entry, now) 369 + || Self::is_expired_entry_ao(&self.time_to_idle, entry, now) 370 + } 371 + 372 + /// Inserts a key-value pair into the cache. 373 + /// 374 + /// If the cache has this key present, the value is updated. 375 + pub fn insert(&mut self, key: K, value: V) { 376 + let timestamp = self.evict_expired_if_needed(); 377 + self.evict_lru_entries(); 378 + let policy_weight = weigh(&mut self.weigher, &key, &value); 379 + let key = Rc::new(key); 380 + let entry = ValueEntry::new(value, policy_weight); 381 + 382 + if let Some(old_entry) = self.cache.insert(Rc::clone(&key), entry) { 383 + self.handle_update(key, timestamp, policy_weight, old_entry); 384 + } else { 385 + let hash = self.hash(&key); 386 + self.handle_insert(key, hash, policy_weight, timestamp); 387 + } 388 + } 389 + 390 + /// Discards any cached value for the key. 391 + /// 392 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 393 + /// on the borrowed form _must_ match those for the key type. 394 + pub fn invalidate<Q>(&mut self, key: &Q) 395 + where 396 + Rc<K>: Borrow<Q>, 397 + Q: Hash + Eq + ?Sized, 398 + { 399 + self.evict_expired_if_needed(); 400 + self.evict_lru_entries(); 401 + 402 + if let Some(mut entry) = self.cache.remove(key) { 403 + let weight = entry.policy_weight(); 404 + self.deques.unlink_ao(&mut entry); 405 + Deques::unlink_wo(&mut self.deques.write_order, &mut entry); 406 + self.saturating_sub_from_total_weight(weight as u64); 407 + } 408 + } 409 + 410 + /// Discards any cached value for the key, returning the cached value. 411 + /// 412 + /// The key may be any borrowed form of the cache's key type, but `Hash` and `Eq` 413 + /// on the borrowed form _must_ match those for the key type. 414 + pub fn remove<Q>(&mut self, key: &Q) -> Option<V> 415 + where 416 + Rc<K>: Borrow<Q>, 417 + Q: Hash + Eq + ?Sized, 418 + { 419 + self.evict_expired_if_needed(); 420 + self.evict_lru_entries(); 421 + 422 + if let Some(mut entry) = self.cache.remove(key) { 423 + let weight = entry.policy_weight(); 424 + self.deques.unlink_ao(&mut entry); 425 + crate::unsync::deques::Deques::unlink_wo(&mut self.deques.write_order, &mut entry); 426 + self.saturating_sub_from_total_weight(weight as u64); 427 + Some(entry.value) 428 + } else { 429 + None 430 + } 431 + } 432 + 433 + /// Discards all cached values. 434 + /// 435 + /// Like the `invalidate` method, this method does not clear the historic 436 + /// popularity estimator of keys so that it retains the client activities of 437 + /// trying to retrieve an item. 438 + pub fn invalidate_all(&mut self) { 439 + self.cache.clear(); 440 + self.deques.clear(); 441 + self.weighted_size = 0; 442 + } 443 + 444 + /// Discards cached values that satisfy a predicate. 445 + /// 446 + /// `invalidate_entries_if` takes a closure that returns `true` or `false`. 447 + /// `invalidate_entries_if` will apply the closure to each cached value, 448 + /// and if the closure returns `true`, the value will be invalidated. 449 + /// 450 + /// Like the `invalidate` method, this method does not clear the historic 451 + /// popularity estimator of keys so that it retains the client activities of 452 + /// trying to retrieve an item. 453 + // ----------------------------------------------------------------------- 454 + // (The followings are not doc comments) 455 + // We need this #[allow(...)] to avoid a false Clippy warning about needless 456 + // collect to create keys_to_invalidate. 457 + // clippy 0.1.52 (9a1dfd2dc5c 2021-04-30) in Rust 1.52.0-beta.7 458 + #[allow(clippy::needless_collect)] 459 + pub fn invalidate_entries_if(&mut self, mut predicate: impl FnMut(&K, &V) -> bool) { 460 + let Self { cache, deques, .. } = self; 461 + 462 + // Since we can't do cache.iter() and cache.remove() at the same time, 463 + // invalidation needs to run in two steps: 464 + // 1. Examine all entries in this cache and collect keys to invalidate. 465 + // 2. Remove entries for the keys. 466 + 467 + let keys_to_invalidate = cache 468 + .iter() 469 + .filter(|(key, entry)| (predicate)(key, &entry.value)) 470 + .map(|(key, _)| Rc::clone(key)) 471 + .collect::<Vec<_>>(); 472 + 473 + let mut invalidated = 0u64; 474 + 475 + keys_to_invalidate.into_iter().for_each(|k| { 476 + if let Some(mut entry) = cache.remove(&k) { 477 + let weight = entry.policy_weight(); 478 + deques.unlink_ao(&mut entry); 479 + Deques::unlink_wo(&mut deques.write_order, &mut entry); 480 + invalidated = invalidated.saturating_sub(weight as u64); 481 + } 482 + }); 483 + self.saturating_sub_from_total_weight(invalidated); 484 + } 485 + 486 + /// Creates an iterator visiting all key-value pairs in arbitrary order. The 487 + /// iterator element type is `(&K, &V)`. 488 + /// 489 + /// Unlike the `get` method, visiting entries via an iterator do not update the 490 + /// historic popularity estimator or reset idle timers for keys. 491 + /// 492 + /// # Examples 493 + /// 494 + /// ```rust 495 + /// use mini_moka::unsync::Cache; 496 + /// 497 + /// let mut cache = Cache::new(100); 498 + /// cache.insert("Julia", 14); 499 + /// 500 + /// let mut iter = cache.iter(); 501 + /// let (k, v) = iter.next().unwrap(); // (&K, &V) 502 + /// assert_eq!(k, &"Julia"); 503 + /// assert_eq!(v, &14); 504 + /// 505 + /// assert!(iter.next().is_none()); 506 + /// ``` 507 + /// 508 + pub fn iter(&self) -> Iter<'_, K, V, S> { 509 + Iter::new(self, self.cache.iter()) 510 + } 511 + } 512 + 513 + // 514 + // private 515 + // 516 + impl<K, V, S> Cache<K, V, S> 517 + where 518 + K: Hash + Eq, 519 + S: BuildHasher + Clone, 520 + { 521 + #[inline] 522 + fn hash<Q>(&self, key: &Q) -> u64 523 + where 524 + Rc<K>: Borrow<Q>, 525 + Q: Hash + Eq + ?Sized, 526 + { 527 + self.build_hasher.hash_one(key) 528 + } 529 + 530 + #[inline] 531 + fn has_expiry(&self) -> bool { 532 + self.time_to_live.is_some() || self.time_to_idle.is_some() 533 + } 534 + 535 + #[inline] 536 + fn evict_expired_if_needed(&mut self) -> Option<Instant> { 537 + if self.has_expiry() { 538 + let ts = self.current_time_from_expiration_clock(); 539 + self.evict_expired(ts); 540 + Some(ts) 541 + } else { 542 + None 543 + } 544 + } 545 + 546 + #[inline] 547 + fn current_time_from_expiration_clock(&self) -> Instant { 548 + if let Some(clock) = &self.expiration_clock { 549 + Instant::new(clock.now()) 550 + } else { 551 + Instant::now() 552 + } 553 + } 554 + 555 + #[inline] 556 + fn is_expired_entry_ao( 557 + time_to_idle: &Option<Duration>, 558 + entry: &impl AccessTime, 559 + now: Instant, 560 + ) -> bool { 561 + if let (Some(ts), Some(tti)) = (entry.last_accessed(), time_to_idle) { 562 + let checked_add = ts.checked_add(*tti); 563 + if checked_add.is_none() { 564 + panic!("ttl overflow") 565 + } 566 + return checked_add.unwrap() <= now; 567 + } 568 + false 569 + } 570 + 571 + #[inline] 572 + fn is_expired_entry_wo( 573 + time_to_live: &Option<Duration>, 574 + entry: &impl AccessTime, 575 + now: Instant, 576 + ) -> bool { 577 + if let (Some(ts), Some(ttl)) = (entry.last_modified(), time_to_live) { 578 + let checked_add = ts.checked_add(*ttl); 579 + if checked_add.is_none() { 580 + panic!("ttl overflow") 581 + } 582 + return checked_add.unwrap() <= now; 583 + } 584 + false 585 + } 586 + 587 + fn record_hit(deques: &mut Deques<K>, entry: &mut ValueEntry<K, V>, ts: Option<Instant>) { 588 + if let Some(ts) = ts { 589 + entry.set_last_accessed(ts); 590 + } 591 + deques.move_to_back_ao(entry) 592 + } 593 + 594 + fn has_enough_capacity(&self, candidate_weight: u32, ws: u64) -> bool { 595 + self.max_capacity 596 + .map(|limit| ws + candidate_weight as u64 <= limit) 597 + .unwrap_or(true) 598 + } 599 + 600 + fn weights_to_evict(&self) -> u64 { 601 + self.max_capacity 602 + .map(|limit| self.weighted_size.saturating_sub(limit)) 603 + .unwrap_or_default() 604 + } 605 + 606 + #[inline] 607 + fn should_enable_frequency_sketch(&self) -> bool { 608 + if self.frequency_sketch_enabled { 609 + false 610 + } else if let Some(max_cap) = self.max_capacity { 611 + self.weighted_size >= max_cap / 2 612 + } else { 613 + false 614 + } 615 + } 616 + 617 + #[inline] 618 + fn enable_frequency_sketch(&mut self) { 619 + if let Some(max_cap) = self.max_capacity { 620 + let cap = if self.weigher.is_none() { 621 + max_cap 622 + } else { 623 + (self.entry_count as f64 * (self.weighted_size as f64 / max_cap as f64)) as u64 624 + }; 625 + self.do_enable_frequency_sketch(cap); 626 + } 627 + } 628 + 629 + #[cfg(test)] 630 + fn enable_frequency_sketch_for_testing(&mut self) { 631 + if let Some(max_cap) = self.max_capacity { 632 + self.do_enable_frequency_sketch(max_cap); 633 + } 634 + } 635 + 636 + #[inline] 637 + fn do_enable_frequency_sketch(&mut self, cache_capacity: u64) { 638 + let skt_capacity = common::sketch_capacity(cache_capacity); 639 + self.frequency_sketch.ensure_capacity(skt_capacity); 640 + self.frequency_sketch_enabled = true; 641 + } 642 + 643 + fn saturating_add_to_total_weight(&mut self, weight: u64) { 644 + let total = &mut self.weighted_size; 645 + *total = total.saturating_add(weight); 646 + } 647 + 648 + fn saturating_sub_from_total_weight(&mut self, weight: u64) { 649 + let total = &mut self.weighted_size; 650 + *total = total.saturating_sub(weight); 651 + } 652 + 653 + #[inline] 654 + fn handle_insert( 655 + &mut self, 656 + key: Rc<K>, 657 + hash: u64, 658 + policy_weight: u32, 659 + timestamp: Option<Instant>, 660 + ) { 661 + let has_free_space = self.has_enough_capacity(policy_weight, self.weighted_size); 662 + let (cache, deqs, freq) = (&mut self.cache, &mut self.deques, &self.frequency_sketch); 663 + 664 + if has_free_space { 665 + // Add the candidate to the deque. 666 + let key = Rc::clone(&key); 667 + let entry = cache.get_mut(&key).unwrap(); 668 + deqs.push_back_ao( 669 + CacheRegion::MainProbation, 670 + KeyHashDate::new(Rc::clone(&key), hash, timestamp), 671 + entry, 672 + ); 673 + if self.time_to_live.is_some() { 674 + deqs.push_back_wo(KeyDate::new(key, timestamp), entry); 675 + } 676 + self.entry_count += 1; 677 + self.saturating_add_to_total_weight(policy_weight as u64); 678 + 679 + if self.should_enable_frequency_sketch() { 680 + self.enable_frequency_sketch(); 681 + } 682 + 683 + return; 684 + } 685 + 686 + if let Some(max) = self.max_capacity { 687 + if policy_weight as u64 > max { 688 + // The candidate is too big to fit in the cache. Reject it. 689 + cache.remove(&Rc::clone(&key)); 690 + return; 691 + } 692 + } 693 + 694 + let mut candidate = EntrySizeAndFrequency::new(policy_weight as u64); 695 + candidate.add_frequency(freq, hash); 696 + 697 + match Self::admit(&candidate, cache, deqs, freq, &mut self.weigher) { 698 + AdmissionResult::Admitted { 699 + victim_nodes, 700 + victims_weight, 701 + } => { 702 + // Remove the victims from the cache (hash map) and deque. 703 + for victim in victim_nodes { 704 + // Remove the victim from the hash map. 705 + let mut vic_entry = cache 706 + .remove(unsafe { &victim.as_ref().element.key }) 707 + .expect("Cannot remove a victim from the hash map"); 708 + // And then remove the victim from the deques. 709 + deqs.unlink_ao(&mut vic_entry); 710 + Deques::unlink_wo(&mut deqs.write_order, &mut vic_entry); 711 + self.entry_count -= 1; 712 + } 713 + 714 + // Add the candidate to the deque. 715 + let entry = cache.get_mut(&key).unwrap(); 716 + let key = Rc::clone(&key); 717 + deqs.push_back_ao( 718 + CacheRegion::MainProbation, 719 + KeyHashDate::new(Rc::clone(&key), hash, timestamp), 720 + entry, 721 + ); 722 + if self.time_to_live.is_some() { 723 + deqs.push_back_wo(KeyDate::new(key, timestamp), entry); 724 + } 725 + 726 + self.entry_count += 1; 727 + Self::saturating_sub_from_total_weight(self, victims_weight); 728 + Self::saturating_add_to_total_weight(self, policy_weight as u64); 729 + 730 + if self.should_enable_frequency_sketch() { 731 + self.enable_frequency_sketch(); 732 + } 733 + } 734 + AdmissionResult::Rejected => { 735 + // Remove the candidate from the cache. 736 + cache.remove(&key); 737 + } 738 + } 739 + } 740 + 741 + /// Performs size-aware admission explained in the paper: 742 + /// [Lightweight Robust Size Aware Cache Management][size-aware-cache-paper] 743 + /// by Gil Einziger, Ohad Eytan, Roy Friedman, Ben Manes. 744 + /// 745 + /// [size-aware-cache-paper]: https://arxiv.org/abs/2105.08770 746 + /// 747 + /// There are some modifications in this implementation: 748 + /// - To admit to the main space, candidate's frequency must be higher than 749 + /// the aggregated frequencies of the potential victims. (In the paper, 750 + /// `>=` operator is used rather than `>`) The `>` operator will do a better 751 + /// job to prevent the main space from polluting. 752 + /// - When a candidate is rejected, the potential victims will stay at the LRU 753 + /// position of the probation access-order queue. (In the paper, they will be 754 + /// promoted (to the MRU position?) to force the eviction policy to select a 755 + /// different set of victims for the next candidate). We may implement the 756 + /// paper's behavior later? 757 + /// 758 + #[inline] 759 + fn admit( 760 + candidate: &EntrySizeAndFrequency, 761 + cache: &CacheStore<K, V, S>, 762 + deqs: &Deques<K>, 763 + freq: &FrequencySketch, 764 + weigher: &mut Option<Weigher<K, V>>, 765 + ) -> AdmissionResult<K> { 766 + let mut victims = EntrySizeAndFrequency::default(); 767 + let mut victim_nodes = SmallVec::default(); 768 + 769 + // Get first potential victim at the LRU position. 770 + let mut next_victim = deqs.probation.peek_front_ptr(); 771 + 772 + // Aggregate potential victims. 773 + while victims.weight < candidate.weight { 774 + if candidate.freq < victims.freq { 775 + break; 776 + } 777 + if let Some(victim) = next_victim.take() { 778 + next_victim = DeqNode::next_node_ptr(victim); 779 + let vic_elem = &unsafe { victim.as_ref() }.element; 780 + 781 + let vic_entry = cache 782 + .get(&vic_elem.key) 783 + .expect("Cannot get an victim entry"); 784 + victims.add_policy_weight(vic_elem.key.as_ref(), &vic_entry.value, weigher); 785 + victims.add_frequency(freq, vic_elem.hash); 786 + victim_nodes.push(victim); 787 + } else { 788 + // No more potential victims. 789 + break; 790 + } 791 + } 792 + 793 + // Admit or reject the candidate. 794 + 795 + // TODO: Implement some randomness to mitigate hash DoS attack. 796 + // See Caffeine's implementation. 797 + 798 + if victims.weight >= candidate.weight && candidate.freq > victims.freq { 799 + AdmissionResult::Admitted { 800 + victim_nodes, 801 + victims_weight: victims.weight, 802 + } 803 + } else { 804 + AdmissionResult::Rejected 805 + } 806 + } 807 + 808 + fn handle_update( 809 + &mut self, 810 + key: Rc<K>, 811 + timestamp: Option<Instant>, 812 + policy_weight: u32, 813 + old_entry: ValueEntry<K, V>, 814 + ) { 815 + let old_policy_weight = old_entry.policy_weight(); 816 + 817 + let entry = self.cache.get_mut(&key).unwrap(); 818 + entry.replace_deq_nodes_with(old_entry); 819 + if let Some(ts) = timestamp { 820 + entry.set_last_accessed(ts); 821 + entry.set_last_modified(ts); 822 + } 823 + entry.set_policy_weight(policy_weight); 824 + 825 + let deqs = &mut self.deques; 826 + deqs.move_to_back_ao(entry); 827 + if self.time_to_live.is_some() { 828 + deqs.move_to_back_wo(entry); 829 + } 830 + 831 + self.saturating_sub_from_total_weight(old_policy_weight as u64); 832 + self.saturating_add_to_total_weight(policy_weight as u64); 833 + } 834 + 835 + fn evict_expired(&mut self, now: Instant) { 836 + if self.time_to_live.is_some() { 837 + let (count, weight) = self.remove_expired_wo(EVICTION_BATCH_SIZE, now); 838 + self.entry_count -= count; 839 + self.saturating_sub_from_total_weight(weight); 840 + } 841 + 842 + if self.time_to_idle.is_some() { 843 + let deqs = &mut self.deques; 844 + let (window, probation, protected, wo, cache, time_to_idle) = ( 845 + &mut deqs.window, 846 + &mut deqs.probation, 847 + &mut deqs.protected, 848 + &mut deqs.write_order, 849 + &mut self.cache, 850 + &self.time_to_idle, 851 + ); 852 + 853 + let mut rm_expired_ao = |name, deq| { 854 + Self::remove_expired_ao( 855 + name, 856 + deq, 857 + wo, 858 + cache, 859 + time_to_idle, 860 + EVICTION_BATCH_SIZE, 861 + now, 862 + ) 863 + }; 864 + 865 + let (count1, weight1) = rm_expired_ao("window", window); 866 + let (count2, weight2) = rm_expired_ao("probation", probation); 867 + let (count3, weight3) = rm_expired_ao("protected", protected); 868 + 869 + self.entry_count -= count1 + count2 + count3; 870 + self.saturating_sub_from_total_weight(weight1); 871 + self.saturating_sub_from_total_weight(weight2); 872 + self.saturating_sub_from_total_weight(weight3); 873 + } 874 + } 875 + 876 + // Returns (u64, u64) where (evicted_entry_count, evicted_policy_weight). 877 + #[inline] 878 + fn remove_expired_ao( 879 + deq_name: &str, 880 + deq: &mut Deque<KeyHashDate<K>>, 881 + write_order_deq: &mut Deque<KeyDate<K>>, 882 + cache: &mut CacheStore<K, V, S>, 883 + time_to_idle: &Option<Duration>, 884 + batch_size: usize, 885 + now: Instant, 886 + ) -> (u64, u64) { 887 + let mut evicted_entry_count = 0u64; 888 + let mut evicted_policy_weight = 0u64; 889 + 890 + for _ in 0..batch_size { 891 + let key = deq 892 + .peek_front() 893 + .and_then(|node| { 894 + if Self::is_expired_entry_ao(time_to_idle, node, now) { 895 + Some(Some(Rc::clone(&node.element.key))) 896 + } else { 897 + None 898 + } 899 + }) 900 + .unwrap_or_default(); 901 + 902 + if key.is_none() { 903 + break; 904 + } 905 + 906 + let key = key.unwrap(); 907 + 908 + if let Some(mut entry) = cache.remove(&key) { 909 + let weight = entry.policy_weight(); 910 + Deques::unlink_ao_from_deque(deq_name, deq, &mut entry); 911 + Deques::unlink_wo(write_order_deq, &mut entry); 912 + evicted_entry_count += 1; 913 + evicted_policy_weight = evicted_policy_weight.saturating_add(weight as u64); 914 + } else { 915 + deq.pop_front(); 916 + } 917 + } 918 + 919 + (evicted_entry_count, evicted_policy_weight) 920 + } 921 + 922 + // Returns (u64, u64) where (evicted_entry_count, evicted_policy_weight). 923 + #[inline] 924 + fn remove_expired_wo(&mut self, batch_size: usize, now: Instant) -> (u64, u64) { 925 + let mut evicted_entry_count = 0u64; 926 + let mut evicted_policy_weight = 0u64; 927 + let time_to_live = &self.time_to_live; 928 + 929 + for _ in 0..batch_size { 930 + let key = self 931 + .deques 932 + .write_order 933 + .peek_front() 934 + .and_then(|node| { 935 + if Self::is_expired_entry_wo(time_to_live, node, now) { 936 + Some(Some(Rc::clone(&node.element.key))) 937 + } else { 938 + None 939 + } 940 + }) 941 + .unwrap_or_default(); 942 + 943 + if key.is_none() { 944 + break; 945 + } 946 + 947 + let key = key.unwrap(); 948 + 949 + if let Some(mut entry) = self.cache.remove(&key) { 950 + let weight = entry.policy_weight(); 951 + self.deques.unlink_ao(&mut entry); 952 + Deques::unlink_wo(&mut self.deques.write_order, &mut entry); 953 + evicted_entry_count += 1; 954 + evicted_policy_weight = evicted_policy_weight.saturating_sub(weight as u64); 955 + } else { 956 + self.deques.write_order.pop_front(); 957 + } 958 + } 959 + 960 + (evicted_entry_count, evicted_policy_weight) 961 + } 962 + 963 + #[inline] 964 + fn evict_lru_entries(&mut self) { 965 + const DEQ_NAME: &str = "probation"; 966 + 967 + let weights_to_evict = self.weights_to_evict(); 968 + let mut evicted_count = 0u64; 969 + let mut evicted_policy_weight = 0u64; 970 + 971 + { 972 + let deqs = &mut self.deques; 973 + let (probation, wo, cache) = 974 + (&mut deqs.probation, &mut deqs.write_order, &mut self.cache); 975 + 976 + for _ in 0..EVICTION_BATCH_SIZE { 977 + if evicted_policy_weight >= weights_to_evict { 978 + break; 979 + } 980 + 981 + // clippy::map_clone will give us a false positive warning here. 982 + // Version: clippy 0.1.77 (f2048098a1c 2024-02-09) in Rust 1.77.0-beta.2 983 + #[allow(clippy::map_clone)] 984 + let key = probation 985 + .peek_front() 986 + .map(|node| Rc::clone(&node.element.key)); 987 + 988 + if key.is_none() { 989 + break; 990 + } 991 + let key = key.unwrap(); 992 + 993 + if let Some(mut entry) = cache.remove(&key) { 994 + let weight = entry.policy_weight(); 995 + Deques::unlink_ao_from_deque(DEQ_NAME, probation, &mut entry); 996 + Deques::unlink_wo(wo, &mut entry); 997 + evicted_count += 1; 998 + evicted_policy_weight = evicted_policy_weight.saturating_add(weight as u64); 999 + } else { 1000 + probation.pop_front(); 1001 + } 1002 + } 1003 + } 1004 + 1005 + self.entry_count -= evicted_count; 1006 + self.saturating_sub_from_total_weight(evicted_policy_weight); 1007 + } 1008 + } 1009 + 1010 + // 1011 + // for testing 1012 + // 1013 + #[cfg(test)] 1014 + impl<K, V, S> Cache<K, V, S> 1015 + where 1016 + K: Hash + Eq, 1017 + S: BuildHasher + Clone, 1018 + { 1019 + fn set_expiration_clock(&mut self, clock: Option<crate::common::time::Clock>) { 1020 + self.expiration_clock = clock; 1021 + } 1022 + } 1023 + 1024 + #[derive(Default)] 1025 + struct EntrySizeAndFrequency { 1026 + weight: u64, 1027 + freq: u32, 1028 + } 1029 + 1030 + impl EntrySizeAndFrequency { 1031 + fn new(policy_weight: u64) -> Self { 1032 + Self { 1033 + weight: policy_weight, 1034 + ..Default::default() 1035 + } 1036 + } 1037 + 1038 + fn add_policy_weight<K, V>(&mut self, key: &K, value: &V, weigher: &mut Option<Weigher<K, V>>) { 1039 + self.weight += weigh(weigher, key, value) as u64; 1040 + } 1041 + 1042 + fn add_frequency(&mut self, freq: &FrequencySketch, hash: u64) { 1043 + self.freq += freq.frequency(hash) as u32; 1044 + } 1045 + } 1046 + 1047 + // Access-Order Queue Node 1048 + type AoqNode<K> = NonNull<DeqNode<KeyHashDate<K>>>; 1049 + 1050 + enum AdmissionResult<K> { 1051 + Admitted { 1052 + victim_nodes: SmallVec<[AoqNode<K>; 8]>, 1053 + victims_weight: u64, 1054 + }, 1055 + Rejected, 1056 + } 1057 + 1058 + // 1059 + // private free-standing functions 1060 + // 1061 + #[inline] 1062 + fn weigh<K, V>(weigher: &mut Option<Weigher<K, V>>, key: &K, value: &V) -> u32 { 1063 + weigher.as_mut().map(|w| w(key, value)).unwrap_or(1) 1064 + } 1065 + 1066 + // To see the debug prints, run test as `cargo test -- --nocapture` 1067 + #[cfg(test)] 1068 + mod tests { 1069 + use wasm_bindgen_test::wasm_bindgen_test; 1070 + 1071 + use super::Cache; 1072 + use crate::common::time::Clock; 1073 + 1074 + use std::time::Duration; 1075 + 1076 + #[test] 1077 + #[wasm_bindgen_test] 1078 + fn basic_single_thread() { 1079 + let mut cache = Cache::new(3); 1080 + cache.enable_frequency_sketch_for_testing(); 1081 + 1082 + cache.insert("a", "alice"); 1083 + cache.insert("b", "bob"); 1084 + assert_eq!(cache.get(&"a"), Some(&"alice")); 1085 + assert!(cache.contains_key(&"a")); 1086 + assert!(cache.contains_key(&"b")); 1087 + assert_eq!(cache.get(&"b"), Some(&"bob")); 1088 + // counts: a -> 1, b -> 1 1089 + 1090 + cache.insert("c", "cindy"); 1091 + assert_eq!(cache.get(&"c"), Some(&"cindy")); 1092 + assert!(cache.contains_key(&"c")); 1093 + // counts: a -> 1, b -> 1, c -> 1 1094 + 1095 + assert!(cache.contains_key(&"a")); 1096 + assert_eq!(cache.get(&"a"), Some(&"alice")); 1097 + assert_eq!(cache.get(&"b"), Some(&"bob")); 1098 + assert!(cache.contains_key(&"b")); 1099 + // counts: a -> 2, b -> 2, c -> 1 1100 + 1101 + // "d" should not be admitted because its frequency is too low. 1102 + cache.insert("d", "david"); // count: d -> 0 1103 + assert_eq!(cache.get(&"d"), None); // d -> 1 1104 + assert!(!cache.contains_key(&"d")); 1105 + 1106 + cache.insert("d", "david"); 1107 + assert!(!cache.contains_key(&"d")); 1108 + assert_eq!(cache.get(&"d"), None); // d -> 2 1109 + 1110 + // "d" should be admitted and "c" should be evicted 1111 + // because d's frequency is higher than c's. 1112 + cache.insert("d", "dennis"); 1113 + assert_eq!(cache.get(&"a"), Some(&"alice")); 1114 + assert_eq!(cache.get(&"b"), Some(&"bob")); 1115 + assert_eq!(cache.get(&"c"), None); 1116 + assert_eq!(cache.get(&"d"), Some(&"dennis")); 1117 + assert!(cache.contains_key(&"a")); 1118 + assert!(cache.contains_key(&"b")); 1119 + assert!(!cache.contains_key(&"c")); 1120 + assert!(cache.contains_key(&"d")); 1121 + 1122 + cache.invalidate(&"b"); 1123 + assert_eq!(cache.get(&"b"), None); 1124 + assert!(!cache.contains_key(&"b")); 1125 + } 1126 + 1127 + #[test] 1128 + #[wasm_bindgen_test] 1129 + fn size_aware_eviction() { 1130 + let weigher = |_k: &&str, v: &(&str, u32)| v.1; 1131 + 1132 + let alice = ("alice", 10); 1133 + let bob = ("bob", 15); 1134 + let bill = ("bill", 20); 1135 + let cindy = ("cindy", 5); 1136 + let david = ("david", 15); 1137 + let dennis = ("dennis", 15); 1138 + 1139 + let mut cache = Cache::builder().max_capacity(31).weigher(weigher).build(); 1140 + cache.enable_frequency_sketch_for_testing(); 1141 + 1142 + cache.insert("a", alice); 1143 + cache.insert("b", bob); 1144 + assert_eq!(cache.get(&"a"), Some(&alice)); 1145 + assert!(cache.contains_key(&"a")); 1146 + assert!(cache.contains_key(&"b")); 1147 + assert_eq!(cache.get(&"b"), Some(&bob)); 1148 + // order (LRU -> MRU) and counts: a -> 1, b -> 1 1149 + 1150 + cache.insert("c", cindy); 1151 + assert_eq!(cache.get(&"c"), Some(&cindy)); 1152 + assert!(cache.contains_key(&"c")); 1153 + // order and counts: a -> 1, b -> 1, c -> 1 1154 + 1155 + assert!(cache.contains_key(&"a")); 1156 + assert_eq!(cache.get(&"a"), Some(&alice)); 1157 + assert_eq!(cache.get(&"b"), Some(&bob)); 1158 + assert!(cache.contains_key(&"b")); 1159 + // order and counts: c -> 1, a -> 2, b -> 2 1160 + 1161 + // To enter "d" (weight: 15), it needs to evict "c" (w: 5) and "a" (w: 10). 1162 + // "d" must have higher count than 3, which is the aggregated count 1163 + // of "a" and "c". 1164 + cache.insert("d", david); // count: d -> 0 1165 + assert_eq!(cache.get(&"d"), None); // d -> 1 1166 + assert!(!cache.contains_key(&"d")); 1167 + 1168 + cache.insert("d", david); 1169 + assert!(!cache.contains_key(&"d")); 1170 + assert_eq!(cache.get(&"d"), None); // d -> 2 1171 + 1172 + cache.insert("d", david); 1173 + assert_eq!(cache.get(&"d"), None); // d -> 3 1174 + assert!(!cache.contains_key(&"d")); 1175 + 1176 + cache.insert("d", david); 1177 + assert!(!cache.contains_key(&"d")); 1178 + assert_eq!(cache.get(&"d"), None); // d -> 4 1179 + 1180 + // Finally "d" should be admitted by evicting "c" and "a". 1181 + cache.insert("d", dennis); 1182 + assert_eq!(cache.get(&"a"), None); 1183 + assert_eq!(cache.get(&"b"), Some(&bob)); 1184 + assert_eq!(cache.get(&"c"), None); 1185 + assert_eq!(cache.get(&"d"), Some(&dennis)); 1186 + assert!(!cache.contains_key(&"a")); 1187 + assert!(cache.contains_key(&"b")); 1188 + assert!(!cache.contains_key(&"c")); 1189 + assert!(cache.contains_key(&"d")); 1190 + 1191 + // Update "b" with "bill" (w: 15 -> 20). This should evict "d" (w: 15). 1192 + cache.insert("b", bill); 1193 + assert_eq!(cache.get(&"b"), Some(&bill)); 1194 + assert_eq!(cache.get(&"d"), None); 1195 + assert!(cache.contains_key(&"b")); 1196 + assert!(!cache.contains_key(&"d")); 1197 + 1198 + // Re-add "a" (w: 10) and update "b" with "bob" (w: 20 -> 15). 1199 + cache.insert("a", alice); 1200 + cache.insert("b", bob); 1201 + assert_eq!(cache.get(&"a"), Some(&alice)); 1202 + assert_eq!(cache.get(&"b"), Some(&bob)); 1203 + assert_eq!(cache.get(&"d"), None); 1204 + assert!(cache.contains_key(&"a")); 1205 + assert!(cache.contains_key(&"b")); 1206 + assert!(!cache.contains_key(&"d")); 1207 + 1208 + // Verify the sizes. 1209 + assert_eq!(cache.entry_count(), 2); 1210 + assert_eq!(cache.weighted_size(), 25); 1211 + } 1212 + 1213 + #[test] 1214 + #[wasm_bindgen_test] 1215 + fn invalidate_all() { 1216 + let mut cache = Cache::new(100); 1217 + cache.enable_frequency_sketch_for_testing(); 1218 + 1219 + cache.insert("a", "alice"); 1220 + cache.insert("b", "bob"); 1221 + cache.insert("c", "cindy"); 1222 + assert_eq!(cache.get(&"a"), Some(&"alice")); 1223 + assert_eq!(cache.get(&"b"), Some(&"bob")); 1224 + assert_eq!(cache.get(&"c"), Some(&"cindy")); 1225 + assert!(cache.contains_key(&"a")); 1226 + assert!(cache.contains_key(&"b")); 1227 + assert!(cache.contains_key(&"c")); 1228 + 1229 + cache.invalidate_all(); 1230 + 1231 + cache.insert("d", "david"); 1232 + 1233 + assert!(cache.get(&"a").is_none()); 1234 + assert!(cache.get(&"b").is_none()); 1235 + assert!(cache.get(&"c").is_none()); 1236 + assert_eq!(cache.get(&"d"), Some(&"david")); 1237 + assert!(!cache.contains_key(&"a")); 1238 + assert!(!cache.contains_key(&"b")); 1239 + assert!(!cache.contains_key(&"c")); 1240 + assert!(cache.contains_key(&"d")); 1241 + } 1242 + 1243 + #[test] 1244 + #[wasm_bindgen_test] 1245 + fn invalidate_entries_if() { 1246 + use std::collections::HashSet; 1247 + 1248 + let mut cache = Cache::new(100); 1249 + cache.enable_frequency_sketch_for_testing(); 1250 + 1251 + let (clock, mock) = Clock::mock(); 1252 + cache.set_expiration_clock(Some(clock)); 1253 + 1254 + cache.insert(0, "alice"); 1255 + cache.insert(1, "bob"); 1256 + cache.insert(2, "alex"); 1257 + 1258 + mock.increment(Duration::from_secs(5)); // 5 secs from the start. 1259 + 1260 + assert_eq!(cache.get(&0), Some(&"alice")); 1261 + assert_eq!(cache.get(&1), Some(&"bob")); 1262 + assert_eq!(cache.get(&2), Some(&"alex")); 1263 + assert!(cache.contains_key(&0)); 1264 + assert!(cache.contains_key(&1)); 1265 + assert!(cache.contains_key(&2)); 1266 + 1267 + let names = ["alice", "alex"].iter().cloned().collect::<HashSet<_>>(); 1268 + cache.invalidate_entries_if(move |_k, &v| names.contains(v)); 1269 + 1270 + mock.increment(Duration::from_secs(5)); // 10 secs from the start. 1271 + 1272 + cache.insert(3, "alice"); 1273 + 1274 + assert!(cache.get(&0).is_none()); 1275 + assert!(cache.get(&2).is_none()); 1276 + assert_eq!(cache.get(&1), Some(&"bob")); 1277 + // This should survive as it was inserted after calling invalidate_entries_if. 1278 + assert_eq!(cache.get(&3), Some(&"alice")); 1279 + 1280 + assert!(!cache.contains_key(&0)); 1281 + assert!(cache.contains_key(&1)); 1282 + assert!(!cache.contains_key(&2)); 1283 + assert!(cache.contains_key(&3)); 1284 + 1285 + assert_eq!(cache.cache.len(), 2); 1286 + 1287 + mock.increment(Duration::from_secs(5)); // 15 secs from the start. 1288 + 1289 + cache.invalidate_entries_if(|_k, &v| v == "alice"); 1290 + cache.invalidate_entries_if(|_k, &v| v == "bob"); 1291 + 1292 + assert!(cache.get(&1).is_none()); 1293 + assert!(cache.get(&3).is_none()); 1294 + 1295 + assert!(!cache.contains_key(&1)); 1296 + assert!(!cache.contains_key(&3)); 1297 + 1298 + assert_eq!(cache.cache.len(), 0); 1299 + } 1300 + 1301 + #[test] 1302 + #[wasm_bindgen_test] 1303 + fn time_to_live() { 1304 + let mut cache = Cache::builder() 1305 + .max_capacity(100) 1306 + .time_to_live(Duration::from_secs(10)) 1307 + .build(); 1308 + cache.enable_frequency_sketch_for_testing(); 1309 + 1310 + let (clock, mock) = Clock::mock(); 1311 + cache.set_expiration_clock(Some(clock)); 1312 + 1313 + cache.insert("a", "alice"); 1314 + 1315 + mock.increment(Duration::from_secs(5)); // 5 secs from the start. 1316 + 1317 + assert_eq!(cache.get(&"a"), Some(&"alice")); 1318 + assert!(cache.contains_key(&"a")); 1319 + 1320 + mock.increment(Duration::from_secs(5)); // 10 secs. 1321 + 1322 + assert_eq!(cache.get(&"a"), None); 1323 + assert!(!cache.contains_key(&"a")); 1324 + assert_eq!(cache.iter().count(), 0); 1325 + assert!(cache.cache.is_empty()); 1326 + 1327 + cache.insert("b", "bob"); 1328 + 1329 + assert_eq!(cache.cache.len(), 1); 1330 + 1331 + mock.increment(Duration::from_secs(5)); // 15 secs. 1332 + 1333 + assert_eq!(cache.get(&"b"), Some(&"bob")); 1334 + assert!(cache.contains_key(&"b")); 1335 + assert_eq!(cache.cache.len(), 1); 1336 + 1337 + cache.insert("b", "bill"); 1338 + 1339 + mock.increment(Duration::from_secs(5)); // 20 secs 1340 + 1341 + assert_eq!(cache.get(&"b"), Some(&"bill")); 1342 + assert!(cache.contains_key(&"b")); 1343 + assert_eq!(cache.cache.len(), 1); 1344 + 1345 + mock.increment(Duration::from_secs(5)); // 25 secs 1346 + 1347 + assert_eq!(cache.get(&"a"), None); 1348 + assert_eq!(cache.get(&"b"), None); 1349 + assert!(!cache.contains_key(&"a")); 1350 + assert!(!cache.contains_key(&"b")); 1351 + assert_eq!(cache.iter().count(), 0); 1352 + assert!(cache.cache.is_empty()); 1353 + } 1354 + 1355 + #[test] 1356 + #[wasm_bindgen_test] 1357 + fn time_to_idle() { 1358 + let mut cache = Cache::builder() 1359 + .max_capacity(100) 1360 + .time_to_idle(Duration::from_secs(10)) 1361 + .build(); 1362 + cache.enable_frequency_sketch_for_testing(); 1363 + 1364 + let (clock, mock) = Clock::mock(); 1365 + cache.set_expiration_clock(Some(clock)); 1366 + 1367 + cache.insert("a", "alice"); 1368 + 1369 + mock.increment(Duration::from_secs(5)); // 5 secs from the start. 1370 + 1371 + assert_eq!(cache.get(&"a"), Some(&"alice")); 1372 + 1373 + mock.increment(Duration::from_secs(5)); // 10 secs. 1374 + 1375 + cache.insert("b", "bob"); 1376 + 1377 + assert_eq!(cache.cache.len(), 2); 1378 + 1379 + mock.increment(Duration::from_secs(2)); // 12 secs. 1380 + 1381 + // contains_key does not reset the idle timer for the key. 1382 + assert!(cache.contains_key(&"a")); 1383 + assert!(cache.contains_key(&"b")); 1384 + 1385 + assert_eq!(cache.cache.len(), 2); 1386 + 1387 + mock.increment(Duration::from_secs(3)); // 15 secs. 1388 + 1389 + assert_eq!(cache.get(&"a"), None); 1390 + assert_eq!(cache.get(&"b"), Some(&"bob")); 1391 + assert!(!cache.contains_key(&"a")); 1392 + assert!(cache.contains_key(&"b")); 1393 + assert_eq!(cache.iter().count(), 1); 1394 + assert_eq!(cache.cache.len(), 1); 1395 + 1396 + mock.increment(Duration::from_secs(10)); // 25 secs 1397 + 1398 + assert_eq!(cache.get(&"a"), None); 1399 + assert_eq!(cache.get(&"b"), None); 1400 + assert!(!cache.contains_key(&"a")); 1401 + assert!(!cache.contains_key(&"b")); 1402 + assert_eq!(cache.iter().count(), 0); 1403 + assert!(cache.cache.is_empty()); 1404 + } 1405 + 1406 + #[cfg_attr(target_pointer_width = "16", ignore)] 1407 + #[test] 1408 + #[wasm_bindgen_test] 1409 + fn test_skt_capacity_will_not_overflow() { 1410 + // power of two 1411 + let pot = |exp| 2u64.pow(exp); 1412 + 1413 + let ensure_sketch_len = |max_capacity, len, name| { 1414 + let mut cache = Cache::<u8, u8>::new(max_capacity); 1415 + cache.enable_frequency_sketch_for_testing(); 1416 + assert_eq!(cache.frequency_sketch.table_len(), len as usize, "{}", name); 1417 + }; 1418 + 1419 + if cfg!(target_pointer_width = "32") { 1420 + let pot24 = pot(24); 1421 + let pot16 = pot(16); 1422 + ensure_sketch_len(0, 128, "0"); 1423 + ensure_sketch_len(128, 128, "128"); 1424 + ensure_sketch_len(pot16, pot16, "pot16"); 1425 + // due to ceiling to next_power_of_two 1426 + ensure_sketch_len(pot16 + 1, pot(17), "pot16 + 1"); 1427 + // due to ceiling to next_power_of_two 1428 + ensure_sketch_len(pot24 - 1, pot24, "pot24 - 1"); 1429 + ensure_sketch_len(pot24, pot24, "pot24"); 1430 + ensure_sketch_len(pot(27), pot24, "pot(27)"); 1431 + ensure_sketch_len(u32::MAX as u64, pot24, "u32::MAX"); 1432 + } else { 1433 + // target_pointer_width: 64 or larger. 1434 + let pot30 = pot(30); 1435 + let pot16 = pot(16); 1436 + ensure_sketch_len(0, 128, "0"); 1437 + ensure_sketch_len(128, 128, "128"); 1438 + ensure_sketch_len(pot16, pot16, "pot16"); 1439 + // due to ceiling to next_power_of_two 1440 + ensure_sketch_len(pot16 + 1, pot(17), "pot16 + 1"); 1441 + 1442 + // The following tests will allocate large memory (~8GiB). 1443 + // Skip when running on Circle CI. 1444 + if !cfg!(circleci) { 1445 + // due to ceiling to next_power_of_two 1446 + ensure_sketch_len(pot30 - 1, pot30, "pot30- 1"); 1447 + ensure_sketch_len(pot30, pot30, "pot30"); 1448 + ensure_sketch_len(u64::MAX, pot30, "u64::MAX"); 1449 + } 1450 + }; 1451 + } 1452 + 1453 + #[test] 1454 + #[wasm_bindgen_test] 1455 + fn test_debug_format() { 1456 + let mut cache = Cache::new(10); 1457 + cache.insert('a', "alice"); 1458 + cache.insert('b', "bob"); 1459 + cache.insert('c', "cindy"); 1460 + 1461 + let debug_str = format!("{:?}", cache); 1462 + assert!(debug_str.starts_with('{')); 1463 + assert!(debug_str.contains(r#"'a': "alice""#)); 1464 + assert!(debug_str.contains(r#"'b': "bob""#)); 1465 + assert!(debug_str.contains(r#"'c': "cindy""#)); 1466 + assert!(debug_str.ends_with('}')); 1467 + } 1468 + }

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crates/mini-moka-vendored/src/unsync/deques.rs

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··· 1 + use super::{KeyDate, KeyHashDate, ValueEntry}; 2 + use crate::common::{ 3 + deque::{DeqNode, Deque}, 4 + CacheRegion, 5 + }; 6 + 7 + use std::ptr::NonNull; 8 + use tagptr::TagNonNull; 9 + 10 + pub(crate) struct Deques<K> { 11 + pub(crate) window: Deque<KeyHashDate<K>>, // Not used yet. 12 + pub(crate) probation: Deque<KeyHashDate<K>>, 13 + pub(crate) protected: Deque<KeyHashDate<K>>, // Not used yet. 14 + pub(crate) write_order: Deque<KeyDate<K>>, 15 + } 16 + 17 + impl<K> Default for Deques<K> { 18 + fn default() -> Self { 19 + Self { 20 + window: Deque::new(CacheRegion::Window), 21 + probation: Deque::new(CacheRegion::MainProbation), 22 + protected: Deque::new(CacheRegion::MainProtected), 23 + write_order: Deque::new(CacheRegion::Other), 24 + } 25 + } 26 + } 27 + 28 + impl<K> Deques<K> { 29 + pub(crate) fn clear(&mut self) { 30 + self.window = Deque::new(CacheRegion::Window); 31 + self.probation = Deque::new(CacheRegion::MainProbation); 32 + self.protected = Deque::new(CacheRegion::MainProtected); 33 + self.write_order = Deque::new(CacheRegion::Other); 34 + } 35 + 36 + pub(crate) fn push_back_ao<V>( 37 + &mut self, 38 + region: CacheRegion, 39 + kh: KeyHashDate<K>, 40 + entry: &mut ValueEntry<K, V>, 41 + ) { 42 + let node = Box::new(DeqNode::new(kh)); 43 + let node = match region { 44 + CacheRegion::Window => self.window.push_back(node), 45 + CacheRegion::MainProbation => self.probation.push_back(node), 46 + CacheRegion::MainProtected => self.protected.push_back(node), 47 + CacheRegion::Other => unreachable!(), 48 + }; 49 + let tagged_node = TagNonNull::compose(node, region as usize); 50 + entry.set_access_order_q_node(Some(tagged_node)); 51 + } 52 + 53 + pub(crate) fn push_back_wo<V>(&mut self, kh: KeyDate<K>, entry: &mut ValueEntry<K, V>) { 54 + let node = Box::new(DeqNode::new(kh)); 55 + let node = self.write_order.push_back(node); 56 + entry.set_write_order_q_node(Some(node)); 57 + } 58 + 59 + pub(crate) fn move_to_back_ao<V>(&mut self, entry: &ValueEntry<K, V>) { 60 + if let Some(tagged_node) = entry.access_order_q_node() { 61 + let (node, tag) = tagged_node.decompose(); 62 + let p = unsafe { node.as_ref() }; 63 + match tag.into() { 64 + CacheRegion::Window if self.window.contains(p) => { 65 + unsafe { self.window.move_to_back(node) }; 66 + } 67 + CacheRegion::MainProbation if self.probation.contains(p) => { 68 + unsafe { self.probation.move_to_back(node) }; 69 + } 70 + CacheRegion::MainProtected if self.protected.contains(p) => { 71 + unsafe { self.protected.move_to_back(node) }; 72 + } 73 + _ => unreachable!(), 74 + } 75 + } 76 + } 77 + 78 + pub(crate) fn move_to_back_wo<V>(&mut self, entry: &ValueEntry<K, V>) { 79 + let node = entry.write_order_q_node().unwrap(); 80 + let p = unsafe { node.as_ref() }; 81 + if self.write_order.contains(p) { 82 + unsafe { self.write_order.move_to_back(node) }; 83 + } 84 + } 85 + 86 + pub(crate) fn unlink_ao<V>(&mut self, entry: &mut ValueEntry<K, V>) { 87 + if let Some(node) = entry.take_access_order_q_node() { 88 + self.unlink_node_ao(node); 89 + } 90 + } 91 + 92 + pub(crate) fn unlink_ao_from_deque<V>( 93 + deq_name: &str, 94 + deq: &mut Deque<KeyHashDate<K>>, 95 + entry: &mut ValueEntry<K, V>, 96 + ) { 97 + if let Some(node) = entry.take_access_order_q_node() { 98 + unsafe { Self::unlink_node_ao_from_deque(deq_name, deq, node) }; 99 + } 100 + } 101 + 102 + pub(crate) fn unlink_wo<V>(deq: &mut Deque<KeyDate<K>>, entry: &mut ValueEntry<K, V>) { 103 + if let Some(node) = entry.take_write_order_q_node() { 104 + Self::unlink_node_wo(deq, node); 105 + } 106 + } 107 + 108 + pub(crate) fn unlink_node_ao(&mut self, tagged_node: TagNonNull<DeqNode<KeyHashDate<K>>, 2>) { 109 + unsafe { 110 + match tagged_node.decompose_tag().into() { 111 + CacheRegion::Window => { 112 + Self::unlink_node_ao_from_deque("window", &mut self.window, tagged_node) 113 + } 114 + CacheRegion::MainProbation => { 115 + Self::unlink_node_ao_from_deque("probation", &mut self.probation, tagged_node) 116 + } 117 + CacheRegion::MainProtected => { 118 + Self::unlink_node_ao_from_deque("protected", &mut self.protected, tagged_node) 119 + } 120 + _ => unreachable!(), 121 + } 122 + } 123 + } 124 + 125 + unsafe fn unlink_node_ao_from_deque( 126 + deq_name: &str, 127 + deq: &mut Deque<KeyHashDate<K>>, 128 + tagged_node: TagNonNull<DeqNode<KeyHashDate<K>>, 2>, 129 + ) { 130 + let (node, tag) = tagged_node.decompose(); 131 + if deq.region() == tag && deq.contains(node.as_ref()) { 132 + // https://github.com/moka-rs/moka/issues/64 133 + deq.unlink_and_drop(node); 134 + } else { 135 + panic!( 136 + "unlink_node - node is not a member of {} deque. {:?}", 137 + deq_name, 138 + node.as_ref() 139 + ) 140 + } 141 + } 142 + 143 + pub(crate) fn unlink_node_wo(deq: &mut Deque<KeyDate<K>>, node: NonNull<DeqNode<KeyDate<K>>>) { 144 + unsafe { 145 + let p = node.as_ref(); 146 + if deq.contains(p) { 147 + // https://github.com/moka-rs/moka/issues/64 148 + deq.unlink_and_drop(node); 149 + } else { 150 + panic!( 151 + "unlink_node - node is not a member of write_order deque. {:?}", 152 + p 153 + ) 154 + } 155 + } 156 + } 157 + }

+36

crates/mini-moka-vendored/src/unsync/iter.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + use super::{Cache, ValueEntry}; 2 + 3 + use std::{ 4 + hash::{BuildHasher, Hash}, 5 + rc::Rc, 6 + }; 7 + 8 + type HashMapIter<'i, K, V> = std::collections::hash_map::Iter<'i, Rc<K>, ValueEntry<K, V>>; 9 + 10 + pub struct Iter<'i, K, V, S> { 11 + cache: &'i Cache<K, V, S>, 12 + iter: HashMapIter<'i, K, V>, 13 + } 14 + 15 + impl<'i, K, V, S> Iter<'i, K, V, S> { 16 + pub(crate) fn new(cache: &'i Cache<K, V, S>, iter: HashMapIter<'i, K, V>) -> Self { 17 + Self { cache, iter } 18 + } 19 + } 20 + 21 + impl<'i, K, V, S> Iterator for Iter<'i, K, V, S> 22 + where 23 + K: Hash + Eq, 24 + S: BuildHasher + Clone, 25 + { 26 + type Item = (&'i K, &'i V); 27 + 28 + fn next(&mut self) -> Option<Self::Item> { 29 + for (k, entry) in self.iter.by_ref() { 30 + if !self.cache.is_expired_entry(entry) { 31 + return Some((k, &entry.value)); 32 + } 33 + } 34 + None 35 + } 36 + }

+64

crates/mini-moka-vendored/tests/compile_tests/sync/clone/sync_cache_clone.rs

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + // https://github.com/moka-rs/moka/issues/131 2 + 3 + use std::{collections::hash_map::DefaultHasher, hash::BuildHasher, sync::Arc}; 4 + 5 + use mini_moka::sync::Cache; 6 + 7 + fn main() { 8 + f1_fail(); 9 + f2_pass(); 10 + f3_fail(); 11 + f4_pass(); 12 + } 13 + 14 + const CAP: u64 = 100; 15 + 16 + fn f1_fail() { 17 + // This should fail because V is not Clone. 18 + let _cache: Cache<MyKey, MyValue> = Cache::new(CAP); 19 + } 20 + 21 + fn f2_pass() { 22 + let cache: Cache<MyKey, Arc<MyValue>> = Cache::new(CAP); 23 + let _ = cache.clone(); 24 + } 25 + 26 + fn f3_fail() { 27 + // This should fail because S is not Clone. 28 + let _cache: Cache<MyKey, Arc<MyValue>, _> = Cache::builder().build_with_hasher(MyBuildHasher1); 29 + } 30 + 31 + fn f4_pass() { 32 + let cache: Cache<MyKey, Arc<MyValue>, _> = Cache::builder().build_with_hasher(MyBuildHasher2); 33 + let _ = cache.clone(); 34 + } 35 + 36 + // MyKey is not Clone. 37 + #[derive(Hash, PartialEq, Eq)] 38 + pub struct MyKey(i32); 39 + 40 + // MyValue is not Clone. 41 + pub struct MyValue(i32); 42 + 43 + // MyBuildHasher1 is not Clone. 44 + pub struct MyBuildHasher1; 45 + 46 + impl BuildHasher for MyBuildHasher1 { 47 + type Hasher = DefaultHasher; 48 + 49 + fn build_hasher(&self) -> Self::Hasher { 50 + unimplemented!() 51 + } 52 + } 53 + 54 + // MyBuildHasher1 is Clone. 55 + #[derive(Clone)] 56 + pub struct MyBuildHasher2; 57 + 58 + impl BuildHasher for MyBuildHasher2 { 59 + type Hasher = DefaultHasher; 60 + 61 + fn build_hasher(&self) -> Self::Hasher { 62 + unimplemented!() 63 + } 64 + }

+33

crates/mini-moka-vendored/tests/compile_tests/sync/clone/sync_cache_clone.stderr

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + error[E0277]: the trait bound `MyValue: Clone` is not satisfied 2 + --> tests/compile_tests/sync/clone/sync_cache_clone.rs:18:41 3 + | 4 + 18 | let _cache: Cache<MyKey, MyValue> = Cache::new(CAP); 5 + | ^^^^^^^^^^ the trait `Clone` is not implemented for `MyValue` 6 + | 7 + note: required by a bound in `mini_moka::sync::Cache::<K, V>::new` 8 + --> src/sync/cache.rs 9 + | 10 + | V: Clone + Send + Sync + 'static, 11 + | ^^^^^ required by this bound in `mini_moka::sync::Cache::<K, V>::new` 12 + help: consider annotating `MyValue` with `#[derive(Clone)]` 13 + | 14 + 41 | #[derive(Clone)] 15 + | 16 + 17 + error[E0277]: the trait bound `MyBuildHasher1: Clone` is not satisfied 18 + --> tests/compile_tests/sync/clone/sync_cache_clone.rs:28:84 19 + | 20 + 28 | let _cache: Cache<MyKey, Arc<MyValue>, _> = Cache::builder().build_with_hasher(MyBuildHasher1); 21 + | ----------------- ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `MyBuildHasher1` 22 + | | 23 + | required by a bound introduced by this call 24 + | 25 + note: required by a bound in `mini_moka::sync::CacheBuilder::<K, V, mini_moka::sync::Cache<K, V>>::build_with_hasher` 26 + --> src/sync/builder.rs 27 + | 28 + | S: BuildHasher + Clone + Send + Sync + 'static, 29 + | ^^^^^ required by this bound in `mini_moka::sync::CacheBuilder::<K, V, mini_moka::sync::Cache<K, V>>::build_with_hasher` 30 + help: consider annotating `MyBuildHasher1` with `#[derive(Clone)]` 31 + | 32 + 44 | #[derive(Clone)] 33 + |

+2

crates/mini-moka-vendored/tests/skeptic.rs

··· 0 0

··· 1 + #[cfg(skeptic)] 2 + include!(concat!(env!("OUT_DIR"), "/skeptic-tests.rs"));