Using EhCache3 for caching in Java API development

In the development of Java API, a common requirement is to cache data to improve system performance and response speed. Ehcache3 is a Java-based open source caching framework that is widely used in caching processing in Java development.

This article will introduce how to use Ehcache3 for caching processing in the development of Java API, including the following aspects:

1. Dependency configuration

Using Ehcache3 for caching processing Previously, Ehcache3 dependencies needed to be added to the project. You can use Maven to configure dependencies, for example:

<dependency>
  <groupId>org.ehcache</groupId>
  <artifactId>ehcache</artifactId>
  <version>3.8.1</version>
</dependency>

2. Cache configuration

Before using Ehcache3 for cache processing in the code, you need to configure the cache. The configuration of Ehcache3 is mainly divided into two parts: cache configuration and cache manager configuration.

Cache configuration is used to set some properties of the cache. You can use the CacheConfiguration class to configure it in the code. For example:

import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.config.units.EntryUnit;
import org.ehcache.config.units.MemoryUnit;

CacheConfiguration<String, String> cacheConfiguration =
  CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class, String.class,
    ResourcePoolsBuilder.newResourcePoolsBuilder()
      .heap(100, EntryUnit.ENTRIES) //设置最大缓存数量
      .offheap(1, MemoryUnit.GB)) //设置 off-heap 缓存的容量
    .build();

The cache manager configuration is used to manage all cache instances. In the code You can use the CacheManager class to configure and obtain cache instances. For example:

import org.ehcache.config.builders.CacheManagerBuilder;

CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder().build();
cacheManager.init();

Cache<String, String> cache = cacheManager.createCache("myCache", cacheConfiguration);

The above code creates a cache instance named "myCache". The cache instance is configured using the cacheConfiguration introduced earlier.

3. Cache operation

When performing cache operations, Ehcache3 provides a series of API methods for operations such as adding, obtaining, and deleting cached data. Here are some commonly used cache operation methods:

• Add cache data

cache.put("key", "value");

• Get cache data

String value = cache.get("key");

• Delete cache data

cache.remove("key");

• Clear cache

cache.clear();

4. Cache implementation

In actual cache implementation, it needs to be based on business needs Use different caching strategies. Ehcache3 provides a variety of caching strategies, such as FIFO, LRU, LFU, etc. It can be set during cache configuration, for example:

import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.Eviction;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.config.units.EntryUnit;

CacheConfiguration<String, String> cacheConfiguration =
  CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class, String.class,
    ResourcePoolsBuilder.newResourcePoolsBuilder()
      .heap(100, EntryUnit.ENTRIES)
      .offheap(1, MemoryUnit.GB))
    .withExpiry(Expirations.timeToLiveExpiration(Duration.ofSeconds(30))) //设置过期时间30s
    .withEvictionAdvisor(key -> key.contains("abc")) //指定删除策略为包含"abc"的key
    .withEviction(Eviction.noAdvice().setPrioritizer(Prioritization.LRU)) //设置缓存淘汰策略为LRU
    .build();

5. Summary

This article introduces how to use Ehcache3 for cache processing in the development of Java API, including dependency configuration, cache configuration, cache Operations and cache implementation, etc. Ehcache3 is a powerful caching framework that can help Java developers handle caching-related business needs more efficiently.

The above is the detailed content of Using EhCache3 for caching in Java API development. For more information, please follow other related articles on the PHP Chinese website!