# cache2k

**Repository Path**: mirrors/cache2k

## Basic Information

- **Project Name**: cache2k
- **Description**: cache2k 是个成熟的性能优越的内存缓存解决方案
- **Primary Language**: Java
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: https://www.oschina.net/p/cache2k
- **GVP Project**: No

## Statistics

- **Stars**: 3
- **Forks**: 2
- **Created**: 2018-01-23
- **Last Updated**: 2023-09-12

## Categories & Tags

**Categories**: cache-modules

**Tags**: None

## 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<String,String> cache = new Cache2kBuilder<String, String>() {}
    .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).