https://github.com/cache2k/cache2k

Lightweight, high performance Java caching
https://github.com/cache2k/cache2k

android android-library cache java java-library

Last synced: 6 days ago
JSON representation

Lightweight, high performance Java caching

• Host: GitHub
• URL: https://github.com/cache2k/cache2k
• Owner: cache2k
• License: apache-2.0
• Created: 2013-12-18T17:25:04.000Z (about 12 years ago)
• Default Branch: master
• Last Pushed: 2025-07-22T12:34:48.000Z (5 months ago)
• Last Synced: 2025-07-22T14:37:28.952Z (5 months ago)
• Topics: android, android-library, cache, java, java-library
• Language: Java
• Homepage: http://cache2k.org
• Size: 9.96 MB
• Stars: 735
• Watchers: 23
• Forks: 75
• Open Issues: 17
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE.txt
  • Code of conduct: CODE_OF_CONDUCT.md

Awesome Lists containing this project

• awesome-java - Cache2K

README

          
[![License](https://x.h7e.eu/badges/txt/license/apache)](https://www.apache.org/licenses/LICENSE-2.0.html)

[![Stack Overflow](https://x.h7e.eu/badges/txt/stackoverflow/cache2k)](https://stackoverflow.com/questions/tagged/cache2k)

[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.cache2k/cache2k-core/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.cache2k/cache2k-core)

[![CircleCI](https://circleci.com/gh/cache2k/cache2k/tree/master.svg?style=shield)](https://circleci.com/gh/cache2k/cache2k/tree/master)

# cache2k Java Caching

cache2k is an in-memory high performance Java Caching library.

````java

  Cache cache = new Cache2kBuilder() {}

    .expireAfterWrite(5, TimeUnit.MINUTES)    // expire/refresh after 5 minutes

    .setupWith(UniversalResiliencePolicy::enable, b -> b // enable resilience policy

      .resilienceDuration(30, TimeUnit.SECONDS)          // cope with at most 30 seconds

                                                         // outage before propagating 

                                                         // exceptions

    )

    .refreshAhead(true)                       // keep fresh when expiring

    .loader(this::expensiveOperation)         // auto populating function

    .build();

````

For a detailed introduction continue with [Getting Started](https://cache2k.org/docs/latest/user-guide.html#getting-started).

## Features at a glance

 * Small jar file (less than 400k) with no external dependencies

 * Fastest access times, due to non blocking and wait free access of cached values, [Blog article](https://cruftex.net/2017/09/01/Java-Caching-Benchmarks-Part-3.html)

 * Pure Java code, no use of `sun.misc.Unsafe`

 * Thread safe, with a complete set of [atomic operations](https://cache2k.org/docs/latest/user-guide.html#atomic-operations)

 * [Resilience and smart exception handling](https://cache2k.org/docs/latest/user-guide.html#resilience) 

 * Null value support, see [User Guide - Null Values](https://cache2k.org/docs/latest/user-guide.html#null-values)

 * Automatic [Expiry and Refresh](https://cache2k.org/docs/latest/user-guide.html#expiry-and-refresh): duration or point in time, variable expiry per entry, delta calculations

 * CacheLoader with blocking read through, see [User Guide - Loading and Read Through](https://cache2k.org/docs/latest/user-guide.html#loading-read-through)

 * CacheWriter

 * [Event listeners](https://cache2k.org/docs/latest/user-guide.html#event-listeners)

 * [Refresh ahead](https://cache2k.org/docs/latest/user-guide.html#refresh-ahead) reduces latency

 * [Low Overhead Statistics](https://cache2k.org/docs/latest/user-guide.html#statistics) and JMX support

 * [Separate API](https://cache2k.org/docs/latest/apidocs/cache2k-api/index.html) with stable and concise interface

 * [complete JCache / JSR107 support](https://cache2k.org/docs/latest/user-guide.html#jcache)

 * [XML based configuration](https://cache2k.org/docs/latest/user-guide.html#xml-configuration), to separate cache tuning from logic

## Integrations

 * [Spring Framework](https://cache2k.org/docs/latest/user-guide.html#spring)

 * [Scala Cache](https://github.com/cb372/scalacache)

 * Datanucleus (via JCache)

 * Hibernate (via JCache)

## More...

For more documentation and latest news, see the [cache2k homepage](https://cache2k.org).

## Contributing

See the [Contributor Guide](CONTRIBUTING.md).