memcache两种客户端比较

1.memcached client for java

客户端API：memcached client for java

网址：http://www.whalin.com/memcached（我从 https://github.com/gwhalin/Memcached-Java-Client/downloads 下载的）

最新版本：java_memcached-release_2.6.6.jar

操作示例：

package com.dxz.cache.memcachedclient;

import com.danga.MemCached.MemCachedClient;
import com.danga.MemCached.SockIOPool;

public class TestMemcached {
    public static void main(String[] args) {
        /* 初始化SockIOPool，管理memcached的连接池 */
        String[] servers = { "192.168.8.28:11211" };
        SockIOPool pool = SockIOPool.getInstance();
        pool.setServers(servers);
        pool.setFailover(true);
        pool.setInitConn(10);
        pool.setMinConn(5);
        pool.setMaxConn(250);
        pool.setMaintSleep(30);
        pool.setNagle(false);
        pool.setSocketTO(3000);
        pool.setAliveCheck(true);
        pool.initialize();
        /* 建立MemcachedClient实例 */
        MemCachedClient memCachedClient = new MemCachedClient();
        for (int i = 0; i < 3; i++) {
            /* 将对象加入到memcached缓存 */
            boolean success = memCachedClient.set("" + i, "Hello!");
            /* 从memcached缓存中按key值取对象 */
            String result = (String) memCachedClient.get("" + i);
            System.out.println(String.format("set( %d ): %s", i, success));
            System.out.println(String.format("get( %d ): %s", i, result));
        }
    }
}

执行结果：

set( 0 ): true
get( 0 ): Hello!
set( 1 ): true
get( 1 ): Hello!
set( 2 ): true
get( 2 ): Hello!

2.spymemcached

客户端API：spymemcached client

网址：http://code.google.com/p/spymemcached/

最新版本：spymemcached-2.9.1.jar

操作示例：用spymemcached将对象存入缓存及从缓存中取出

package com.dxz.cache.spymemcached;

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MClient {

    public static void main(String[] args) {
        try {
            /* 建立MemcachedClient 实例，并指定memcached服务的IP地址和端口号 */
            MemcachedClient mc = new MemcachedClient(new InetSocketAddress("192.168.8.28", 11211));
            Future<Boolean> b = null;
            /* 将key值，过期时间(秒)和要缓存的对象set到memcached中 */
            b = mc.set("abcd123", 900, "someObject");
            System.out.println("set():" + b);

            /* 按照key值从memcached中查找缓存，不存在则返回null */
            Object c = mc.get("abcd123");
            System.out.println("get():" + c);
            if (b.get().booleanValue() == true) {
                mc.shutdown();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

执行结果：

2016-01-21 19:07:23.213 INFO net.spy.memcached.MemcachedConnection: Added {QA sa=/192.168.8.28:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue
2016-01-21 19:07:23.219 INFO net.spy.memcached.MemcachedConnection: Connection state changed for sun.nio.ch.SelectionKeyImpl@4eb754b0
set():net.spy.memcached.internal.OperationFuture@23ac5c8b
get():someObject
2016-01-21 19:07:23.253 INFO net.spy.memcached.MemcachedConnection: Shut down memcached client

3.两种API比较

memcached client for java：较早推出的memcached JAVA客户端API，应用广泛，运行比较稳定。

spymemcached：A simple， asynchronous， single-threaded memcached client written in java. 支持异步，单线程的memcached客户端，用到了java1.5版本的concurrent和nio，存取速度会高于前者，但是稳定性不好，测试中常报timeOut等相关异常。

由于memcached client for java发布了新版本，性能上有所提高，并且运行稳定，所以建议使用memcached client for java.