base on A high performance caching library for Java [](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://central.sonatype.com/artifact/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 * [Coroutines][caffeine-coroutines]: Kotlin Coroutines extension * [Bootique][bootique]: A fast, simple Java platform * [Quarkus][quarkus]: Supersonic Subatomic Java * [Camel][camel]: Routing and mediation engine * [Scaffeine][scaffeine]: Scala wrapper for Caffeine * [ScalaCache][scala-cache]: Simple caching in Scala * [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][] * 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/neo4j/neo4j [finagle]: https://github.com/twitter/finagle [druid]: https://druid.apache.org/docs/latest/configuration/index.html#cache-configuration [jhipster]: https://www.jhipster.tech/ [open-whisk]: https://openwhisk.apache.org/ [camel]: https://github.com/apache/camel/blob/master/components/camel-caffeine/src/main/docs/caffeine-cache-component.adoc [coherence]: https://docs.oracle.com/en/middleware/standalone/coherence/14.1.1.2206/develop-applications/implementing-storage-and-backing-maps.html#GUID-260228C2-371A-4B91-9024-8D6514DD4B78 [corfu]: https://github.com/CorfuDB/CorfuDB [micronaut]: https://docs.micronaut.io/latest/guide/index.html#caching [play]: https://www.playframework.com/documentation/latest/JavaCache [redisson]: https://github.com/redisson/redisson [accumulo]: https://accumulo.apache.org [dropwizard]: https://www.dropwizard.io [grails]: https://grails.org [quarkus]: https://quarkus.io [aedile]: https://github.com/sksamuel/aedile [bootique]: https://bootique.io/ [caffeine-coroutines]: https://github.com/be-hase/caffeine-coroutines ", Assign "at most 3 tags" to the expected json: {"id":"1105","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"