Add moka::dash::Cache, which uses dash::DashMap as the internal storage

.circleci/config.yml

@@ -9,7 +9,7 @@ jobs:
           command: |
             docker run --security-opt seccomp=unconfined -v "${PWD}:/volume" xd009642/tarpaulin \
               cargo tarpaulin -v \
-                --features future \
+                --features 'future, dash' \
                 --ciserver circle-ci \
                 --coveralls ${COVERALLS_TOKEN} \
                 --timeout 600 \

.github/workflows/CI.yml

@@ -49,15 +49,22 @@ jobs:
         with:
           command: build
 
-      - name: Run tests (future)
+      - name: Run tests (release, no features)
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --release
+
+      - name: Run tests (future feature)
         uses: actions-rs/cargo@v1
         if: ${{ matrix.rust != '1.45.2' }}
         with:
           command: test
           args: --features future
 
-      - name: Run tests (release, no features)
+      - name: Run tests (dash feature)
         uses: actions-rs/cargo@v1
+        if: ${{ matrix.rust != '1.45.2' }}
         with:
           command: test
-          args: --release
+          args: --features dash

.github/workflows/LinuxCrossCompileTest.yml

@@ -72,3 +72,10 @@ jobs:
           use-cross: true
           command: test
           args: --release --features future --target ${{ matrix.platform.target }} ${{ matrix.platform.cargo-opts }}
+
+      - name: Run tests (dash feature)
+        uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: test
+          args: --release --features dash --target ${{ matrix.platform.target }} ${{ matrix.platform.cargo-opts }}

.github/workflows/Skeptic.yml

@@ -46,27 +46,27 @@ jobs:
         env:
           RUSTFLAGS: '--cfg skeptic'
 
-      - name: Run tests (release, future)
+      - name: Run tests (release, future and dash)
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --release --features future
+          args: --release --features 'future, dash'
         env:
           RUSTFLAGS: '--cfg skeptic'
 
-      - name: Run tests (future, without atomic64)
+      - name: Run tests (future and dash, without atomic64)
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --release --no-default-features --features future
+          args: --release --no-default-features --features 'future, dash'
         env:
           RUSTFLAGS: '--cfg skeptic'
 
-      - name: Run UI tests (future, trybuild)
+      - name: Run UI tests (future and dash features, trybuild)
         uses: actions-rs/cargo@v1
         if: ${{ matrix.rust == 'stable' }}
         with:
           command: test
-          args: ui_trybuild --release --features future
+          args: ui_trybuild --release --features 'future, dash'
         env:
           RUSTFLAGS: '--cfg trybuild'

.vscode/settings.json

@@ -1,5 +1,5 @@
 {
-    "rust-analyzer.cargo.features": ["future", "unstable-debug-counters"],
+    "rust-analyzer.cargo.features": ["future", "dash", "unstable-debug-counters"],
     "rust-analyzer.server.extraEnv": {
         "CARGO_TARGET_DIR": "target/ra"
     },
@@ -13,6 +13,7 @@
         "clippy",
         "compat",
         "cpus",
+        "dashmap",
         "deqs",
         "Deque",
         "Deques",
@@ -22,6 +23,7 @@
         "getrandom",
         "Hasher",
         "Kawano",
+        "mapref",
         "Moka",
         "mpsc",
         "MSRV",

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Version 0.8.0
 
+### Added
+
+- Add a synchronous cache `moka::dash::Cache`, which uses `dash::DashMap` as
+  the internal storage. ([#99][gh-pull-0099])
+
 ### Changed
 
 - Update the minimum depending version of crossbeam-channel from v0.5.2 to v0.5.4.
@@ -245,6 +250,7 @@ The minimum supported Rust version (MSRV) is now 1.51.0 (2021-03-25).
 [gh-issue-0031]: https://github.com/moka-rs/moka/issues/31/
 
 [gh-pull-0100]: https://github.com/moka-rs/moka/pull/100/
+[gh-pull-0099]: https://github.com/moka-rs/moka/pull/99/
 [gh-pull-0086]: https://github.com/moka-rs/moka/pull/86/
 [gh-pull-0084]: https://github.com/moka-rs/moka/pull/84/
 [gh-pull-0083]: https://github.com/moka-rs/moka/pull/83/

Cargo.toml

@@ -21,6 +21,9 @@ default = ["atomic64"]
 # Enable this feature to use `moka::future::Cache`.
 future = ["async-io", "async-lock", "futures-util"]
 
+# Enable this feature to use `moka::dash::Cache`.
+dash = ["dashmap"]
+
 # This feature is enabled by default. Disable it when the target platform does not
 # support `std::sync::atomic::AtomicU64`. (e.g. `armv5te-unknown-linux-musleabi`
 # or `mips-unknown-linux-musl`)
@@ -47,7 +50,10 @@ thiserror = "1.0"
 triomphe = "0.1"
 uuid = { version = "0.8", features = ["v4"] }
 
-# Optional dependencies
+# Optional dependencies (dashmap)
+dashmap = { version = "5.2", optional = true }
+
+# Optional dependencies (future)
 async-io = { version = "1.4", optional = true }
 async-lock = { version = "2.4", optional = true }
 futures-util = { version = "0.3", optional = true }
@@ -68,8 +74,8 @@ skeptic = "0.13"
 
 # https://docs.rs/about/metadata
 [package.metadata.docs.rs]
-# Build the doc with "future" feature enabled.
-features = ["future"]
+# Build the doc with some features enabled.
+features = ["future", "dash"]
 
 # ----------------------------------
 # RUSTSEC, etc.

README.md

@@ -393,6 +393,7 @@ This crate's minimum supported Rust versions (MSRV) are the followings:
 | no feature |                     | Rust 1.51.0 |
 | `atomic64` |       yes           | Rust 1.51.0 |
 | `future`   |                     | Rust 1.51.0 |
+| `dash`     |                     | Rust 1.51.0 |
 
 If only the default features are enabled, MSRV will be updated conservatively. When
 using other features, like `future`, MSRV might be updated more frequently, up to the
@@ -470,8 +471,8 @@ $ RUSTFLAGS='--cfg skeptic --cfg trybuild' cargo test \
 - [ ] API stabilization. (Smaller core cache API, shorter names for frequently
       used methods)
     - e.g.
-    - `get_or_insert_with(K, F)` → `get(K, F)`
-    - `get_or_try_insert_with(K, F)` → `try_get(K, F)`
+    - `get_or_insert_with(K, F)` → `get_with(K, F)`
+    - `get_or_try_insert_with(K, F)` → `try_get_with(K, F)`
     - `get(&Q)` → `get_if_present(&Q)`
     - `blocking_insert(K, V)` → `blocking().insert(K, V)`
     - `time_to_live()` → `config().time_to_live()`

src/dash.rs

@@ -0,0 +1,20 @@
+//! Provides a thread-safe, concurrent cache implementation built upon
+//! [`dashmap::DashMap`][dashmap].
+//!
+//! To use this module, enable a crate feature called "dash".
+//!
+//! [dashmap]: https://docs.rs/dashmap/*/dashmap/struct.DashMap.html
+
+mod base_cache;
+mod builder;
+mod cache;
+// mod value_initializer;
+
+pub use builder::CacheBuilder;
+pub use cache::Cache;
+
+/// Provides extra methods that will be useful for testing.
+pub trait ConcurrentCacheExt<K, V> {
+    /// Performs any pending maintenance operations needed by the cache.
+    fn sync(&self);
+}