A high performance caching library for Java.zip

[](https://github.com/ben-manes/caffeine/actions?query=workflow%3Abuild+branch%3Amaster) [](https://github.com/ben-manes/caffeine/actions?query=workflow%3Abuild+branch%3Amaster) [](https://coveralls.io/r/ben-manes/caffeine?branch=master) [](https://maven-badges.herokuapp.com/maven-central/com.github.ben-manes.caffeine/caffeine) [](http://www.javadoc.io/doc/com.github.ben-manes.caffeine/caffeine) [](http://www.apache.org/licenses/LICENSE-2.0.html) [](http://stackoverflow.com/questions/tagged/caffeine) [](https://caffeine.gradle-enterprise.cloud/scans) <a href="https://github.com/ben-manes/caffeine/wiki"> <img align="right" height="90px" src="https://raw.githubusercontent.com/ben-manes/caffeine/master/wiki/logo.png"> </a> Caffeine is a [high performance][benchmarks], [near optimal][efficiency] caching library. For more details, see our [user's guide][users-guide] and browse the [API docs][javadoc] for the latest release. ### Cache Caffeine provides an in-memory cache using a Google Guava inspired API. The improvements draw on our experience designing [Guava's cache][guava-cache] and [ConcurrentLinkedHashMap][clhm]. ```java LoadingCache<Key, Graph> graphs = Caffeine.newBuilder() .maximumSize(10_000) .expireAfterWrite(Duration.ofMinutes(5)) .refreshAfterWrite(Duration.ofMinutes(1)) .build(key -> createExpensiveGraph(key)); ``` #### Features at a Glance Caffeine provides flexible construction to create a cache with a combination of the following optional features: * [automatic loading of entries][population] into the cache, optionally asynchronously * [size-based eviction][size] when a maximum is exceeded based on [frequency and recency][efficiency] * [time-based expiration][time] of entries, measured since last access or last write * [asynchronously refresh][refresh] when the first stale request for an entry occurs * keys automatically wrapped in [weak references][reference] * values automatically wrapped in [weak or soft references][reference] * [notification][listener] of evicted (or otherwise removed) entries * [writes propagated][compute] to an external resource * accumulation of cache access [statistics][statistics] In addition, Caffeine offers the following extensions: * [JSR-107 JCache][jsr107] * [Guava adapters][guava-adapter] * [Simulation][simulator] Use Caffeine in a community provided integration: * [Play Framework][play]: High velocity web framework * [Micronaut][micronaut]: A modern, full-stack framework * [Spring Cache][spring]: As of Spring 4.3 & Boot 1.4 * [Quarkus][quarkus]: Supersonic Subatomic Java * [Scaffeine][scaffeine]: Scala wrapper for Caffeine * [ScalaCache][scala-cache]: Simple caching in Scala * [Camel][camel]: Routing and mediation engine * [JHipster][jhipster]: Generate, develop, deploy * [Aedile][aedile]: Kotlin wrapper for Caffeine Powering infrastructure near you: * [Dropwizard][dropwizard]: Ops-friendly, high-performance, RESTful APIs * [Cassandra][cassandra]: Manage massive amounts of data, fast * [Coherence][coherence]: Mission critical in-memory data grid * [Accumulo][accumulo]: A sorted, distributed key/value store * [Kafka][kafka]: A distributed event streaming platform * [HBase][hbase]: A distributed, scalable, big data store * [Apache Solr][solr]: Blazingly fast enterprise search * [Infinispan][infinispan]: Distributed in-memory data grid * [Redisson][redisson]: Ultra-fast in-memory data grid * [OpenWhisk][open-whisk]: Serverless cloud platform * [Corfu][corfu]: A cluster consistency platform * [Grails][grails]: Groovy-based web framework * [Finagle][finagle]: Extensible RPC system * [Neo4j][neo4j]: Graphs for Everyone * [Druid][druid]: Real-time analytics ### In the News * An in-depth description of Caffeine's architecture. * [Design of a Modern Cache: part #1][modern-cache-1], [part #2][modern-cache-2] ([slides][modern-cache-slides]) at [HighScalability][HighScalability] * Caffeine is presented as part of research papers evaluating its novel eviction policy. * [TinyLFU: A Highly Efficient Cache Admission Policy][tinylfu] by Gil Einziger, Roy Friedman, Ben Manes * [Adaptive Software Cache Management][adaptive-tinylfu] by Gil Einziger, Ohad Eytan, Roy Friedman, Ben Manes * [Lightweight Robust Size Aware Cache Management][size-tinylfu] by Gil Einziger, Ohad Eytan, Roy Friedman, Ben Manes ### Download Download from [Maven Central][maven] or depend via Gradle: ```gradle implementation("com.github.ben-manes.caffeine:caffeine:3.1.8") // Optional extensions implementation("com.github.ben-manes.caffeine:guava:3.1.8") implementation("com.github.ben-manes.caffeine:jcache:3.1.8") ``` For Java 11 or above, use `3.x` otherwise use `2.x`. See the [release notes][releases] for details of the changes. Snapshots of the development version are available in [Sonatype's snapshots repository][snapshots]. [benchmarks]: https://github.com/ben-manes/caffeine/wiki/Benchmarks [users-guide]: https://github.com/ben-manes/caffeine/wiki [javadoc]: http://www.javadoc.io/doc/com.github.ben-manes.caffeine/caffeine [guava-cache]: https://github.com/google/guava/wiki/CachesExplained [clhm]: https://github.com/ben-manes/concurrentlinkedhashmap [population]: https://github.com/ben-manes/caffeine/wiki/Population [size]: https://github.com/ben-manes/caffeine/wiki/Eviction#size-based [time]: https://github.com/ben-manes/caffeine/wiki/Eviction#time-based [refresh]: https://github.com/ben-manes/caffeine/wiki/Refresh [reference]: https://github.com/ben-manes/caffeine/wiki/Eviction#reference-based [listener]: https://github.com/ben-manes/caffeine/wiki/Removal [compute]: https://github.com/ben-manes/caffeine/wiki/Compute [statistics]: https://github.com/ben-manes/caffeine/wiki/Statistics [simulator]: https://github.com/ben-manes/caffeine/wiki/Simulator [guava-adapter]: https://github.com/ben-manes/caffeine/wiki/Guava [jsr107]: https://github.com/ben-manes/caffeine/wiki/JCache [maven]: https://maven-badges.herokuapp.com/maven-central/com.github.ben-manes.caffeine/caffeine [releases]: https://github.com/ben-manes/caffeine/releases [snapshots]: https://oss.sonatype.org/content/repositories/snapshots/com/github/ben-manes/caffeine/ [efficiency]: https://github.com/ben-manes/caffeine/wiki/Efficiency [tinylfu]: https://dl.acm.org/doi/10.1145/3149371?cid=99659224047 [adaptive-tinylfu]: https://dl.acm.org/doi/10.1145/3274808.3274816?cid=99659224047 [size-tinylfu]: https://dl.acm.org/doi/10.1145/3507920?cid=99659224047 [modern-cache-1]: http://highscalability.com/blog/2016/1/25/design-of-a-modern-cache.html [modern-cache-2]: http://highscalability.com/blog/2019/2/25/design-of-a-modern-cachepart-deux.html [modern-cache-slides]: https://docs.google.com/presentation/d/1NlDxyXsUG1qlVHMl4vsUUBQfAJ2c2NsFPNPr2qymIBs [highscalability]: http://highscalability.com [spring]: https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#cache-store-configuration-caffeine [scala-cache]: https://github.com/cb372/scalacache [scaffeine]: https://github.com/blemale/scaffeine [kafka]: https://kafka.apache.org [hbase]: https://hbase.apache.org [cassandra]: http://cassandra.apache.org [solr]: https://solr.apache.org/ [infinispan]: https://infinispan.org [neo4j]: https://github.com/n