ehcache3的应用

ehcache的官方说明：一个java的缓存框架。支持内存缓存和磁盘缓存

Ehcache is an open source, standards-based cache that boosts performance, offloads your database, and simplifies scalability. It's the most widely-used Java-based cache because it's robust, proven, full-featured, and integrates with other popular libraries and frameworks. Ehcache scales from in-process caching, all the way to mixed in-process/out-of-process deployments with terabyte-sized caches.

支持的配置

代码语言：javascript复制

heap：JVM byted-size 堆缓存，速度最快； 定义缓存的数量
off-heap：JVM 堆外内存，速度低于 heap，但是高于 disk； 堆外存储空间
disk：磁盘储存，速度最低，相对于 heap ，off-heap可以分配大量资源空间；磁盘存储空间

构建cache对象

代码语言：javascript复制

package cn.beckbi.ex;

import java.io.IOException;
import java.io.Serializable;
import java.net.URL;
import java.time.Duration;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;


import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.Configuration;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.CacheManagerBuilder;
import org.ehcache.config.builders.ExpiryPolicyBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.config.units.EntryUnit;
import org.ehcache.config.units.MemoryUnit;
import org.ehcache.spi.service.ServiceCreationConfiguration;
import org.ehcache.xml.XmlConfiguration;

/**
 * @program: wj
 * @description:
 * @author: bikang
 * @create: 2023-05-28 18:09
 */
public class EHCacheUtil {
    static CacheManager manager=null;

    public static synchronized CacheManager getManager() {
        synchronized (EHCacheUtil.class) {
            if (Objects.nonNull(manager)) {
                return manager;
            }
            manager = CacheManagerBuilder.newCacheManagerBuilder()
                    .with(CacheManagerBuilder.persistence("/tmp/myData"))
                    .withCache("cache0",
                            CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class, String.class,
                                            ResourcePoolsBuilder.newResourcePoolsBuilder()
                                                    .heap(10, EntryUnit.ENTRIES)
                                                    .offheap(1, MemoryUnit.MB)
                                                    .disk(20, MemoryUnit.MB, true))
                                    .withExpiry(ExpiryPolicyBuilder.timeToIdleExpiration(Duration.ofSeconds(20)))
                    ).withCache("cache1",
                            CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class, String.class,
                                            ResourcePoolsBuilder.newResourcePoolsBuilder()
                                                    .heap(10, EntryUnit.ENTRIES)
                                                    .offheap(1, MemoryUnit.MB)
                                                    .disk(20, MemoryUnit.MB, true))
                                    .withExpiry(ExpiryPolicyBuilder.timeToIdleExpiration(Duration.ofSeconds(20)))
                    ).withCache("cache2",
                            CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class, String.class,
                                            ResourcePoolsBuilder.newResourcePoolsBuilder()
                                                    .heap(10, EntryUnit.ENTRIES)
                                                    .offheap(1, MemoryUnit.MB)
                                                    .disk(20, MemoryUnit.MB, true))
                                    .withExpiry(ExpiryPolicyBuilder.timeToIdleExpiration(Duration.ofSeconds(20)))
                    )

                    .build(true);
            return manager;
        }
    }

    public static void put(String cachename,String key,String value){
        Cache<String, String> cacheObj = getManager().getCache(cachename, String.class, String.class);
        cacheObj.put(key, value);
    }

    public static String get(String cachename,String key){
        Cache<String, String> cacheObj = getManager().getCache(cachename, String.class, String.class);
        return cacheObj.get(key);
    }


    public static void remove(String cachename,String key){
        getManager().getCache(cachename, String.class, String.class).remove(key);
    }
}

应用

代码语言：javascript复制

public void testEcache() {
    EHCacheUtil.put("cache0", "a", "1");
    EHCacheUtil.put("cache1", "a", "2");
    EHCacheUtil.put("cache2", "a", "3");
    System.out.println("cache0:a=" EHCacheUtil.get("cache0", "a"));
    System.out.println("cache1:a=" EHCacheUtil.get("cache1", "a"));
    System.out.println("cache2:a=" EHCacheUtil.get("cache2", "a"));
    System.out.println("end");
}

java ehcache

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