Memcached的几种Java客户端(待实践)

其实现在来尝试Memcached的客户端估计会有点过气,因为现在大势基本都在Redis那边。

Memcached Client目前有3种: 

  • Memcached Client for Java(已经停止更新)
  • SpyMemcached(已经停止更新)
  • XMemcached(一直更新,且支持客户端分片实现集群,基本现在是它的天下)
    • 高性能
    • 支持完整的Memcached文本协议,二进制协议。
    • 支持JMX,可以通过MBean调整性能参数、动态添加/移除Server、查看统计等。
    • 支持客户端统计
    • 支持Memcached节点的动态增减。
    • 支持Memcached分布:余数分布和一致性哈希分布。
    • 更多的性能调整选项。
    • XMemcached更容易与Spring集成。
    • 支持客户端分片实现集群。

三种API的比较

1、较早推出的memcached JAVA客户端API,应用广泛,运行比较稳定。

2、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。

3、XMemcached同样是基于java nio的客户端,Java nio相比于传统阻塞IO模型来说,有效率高(特别在高并发下)和资源耗费相对较少的优点。传统阻塞IO为了提高效率,需要创建一定数量的连接形成连接 池,而nio仅需要一个连接即可(当然,nio也是可以做池化处理),相对来说减少了线程创建和切换的开销,这一点在高并发下特别明显。因此XMemcached与Spymemcached在性能都非常优秀,在某些方面(存储的数据比较小的情况下)Xmemcached比Spymemcached的表现更为优秀,具体可以看这个Java Memcached Clients Benchmark。

示例代码

Memcached Client for Java

官网:https://github.com/gwhalin/Memcached-Java-Client

这个已经停止跟新。放弃使用!

import java.util.Date;  
  
import com.danga.MemCached.*;  
  
public class MemcacheManagerForGwhalin {  
  
    // 构建缓存客户端  
    private static MemCachedClient cachedClient;  
    // 单例模式实现客户端管理类  
    private static MemcacheManagerForGwhalin INSTANCE = new MemcacheManagerForGwhalin();  
  
    private MemcacheManagerForGwhalin() {  
        cachedClient = new MemCachedClient();  
          
        // 初始化SockIOPool,管理memcached的连接池  
        SockIOPool pool = SockIOPool.getInstance();  
  
        // 设置缓存服务器列表,当使用分布式缓存的时,可以指定多个缓存服务器。(这里应该设置为多个不同的服务器)  
        String[] servers = { "192.168.163.10:11211", "192.168.163.11:11211"  
        // 也可以使用域名 "server3.mydomain.com:1624"  
        };  
  
        pool.setServers(servers);  
        pool.setFailover(true);  
        pool.setInitConn(10); // 设置初始连接  
        pool.setMinConn(5);// 设置最小连接  
        pool.setMaxConn(250); // 设置最大连接  
        pool.setMaxIdle(1000 * 60 * 60 * 3); // 设置每个连接最大空闲时间3个小时  
        pool.setMaintSleep(30);  
        pool.setNagle(false);  
        pool.setSocketTO(3000);  
        pool.setAliveCheck(true);  
        pool.initialize();  
    }  
  
    /** 
     * 获取缓存管理器唯一实例 
     *  
     * @return 
     */  
    public static MemcacheManagerForGwhalin getInstance() {  
        return INSTANCE;  
    }  
  
    public void add(String key, Object value) {  
        cachedClient.set(key, value);  
    }  
  
    public void add(String key, Object value, int milliseconds) {  
        cachedClient.set(key, value, milliseconds);  
    }  
  
    public void remove(String key) {  
        cachedClient.delete(key);  
    }  
  
    public void remove(String key, int milliseconds) {  
        cachedClient.delete(key, milliseconds, new Date());  
    }  
  
    public void update(String key, Object value, int milliseconds) {  
        cachedClient.replace(key, value, milliseconds);  
    }  
  
    public void update(String key, Object value) {  
        cachedClient.replace(key, value);  
    }  
  
    public Object get(String key) {  
        return cachedClient.get(key);  
    }  
  
    public static void main(String[] args) {  
        //将对象加入到memcached缓存  
        cachedClient.add("keke", "This is a test String");  
        //从memcached缓存中按key值取对象  
        String result  = (String) cachedClient.get("keke");  
        System.out.println(result);  
    }  
      
}   

Spymemcached

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

这个是不错的选择,但是有吭,在GitHub上找不到。

public class MemcacheManagerForSpy implements IMemcacheManager {  
    // 缓存客户端  
    private MemcachedClient memcacheCient;  
    // Manager管理对象,单例模式  
    private static MemcacheManagerForSpy INSTANCE = new MemcacheManagerForSpy();  
  
    private MemcacheManagerForSpy() {  
        try {  
            memcacheCient = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
  
    public static MemcacheManagerForSpy getInstance() {  
        return INSTANCE;  
    }  
  
    @Override  
    public void add(String key, Object value, int milliseconds) {  
        memcacheCient.add(key, milliseconds, value);  
    }  
  
    @Override  
    public void add(String key, Object value) {  
        memcacheCient.add(key, 3600, value);  
  
    }  
  
    @Override  
    public void remove(String key, int milliseconds) {  
        memcacheCient.delete(key);  
    }  
  
    @Override  
    public void remove(String key) {  
        memcacheCient.delete(key);  
    }  
  
    @Override  
    public void update(String key, Object value, int milliseconds) {  
        memcacheCient.replace(key, milliseconds, value);  
    }  
  
    @Override  
    public void update(String key, Object value) {  
        memcacheCient.replace(key, 3600, value);  
    }  
  
    @Override  
    public Object get(String key) {  
        return memcacheCient.get(key);  
    }  
}  

Xmemcached

官网:https://github.com/killme2008/xmemcached

操作指南:https://github.com/killme2008/xmemcached/wiki/Xmemcached%20%E4%B8%AD%E6%96%87%E7%94%A8%E6%88%B7%E6%8C%87%E5%8D%97

目前最火,且时长更新,截止今天都还在更新。

import java.io.IOException;  
import java.util.concurrent.TimeoutException;  
import net.rubyeye.xmemcached.utils.AddrUtil;  
import net.rubyeye.xmemcached.MemcachedClient;  
import net.rubyeye.xmemcached.MemcachedClientBuilder;  
import net.rubyeye.xmemcached.XMemcachedClientBuilder;  
import net.rubyeye.xmemcached.exception.MemcachedException;  
public class TestXMemcache {  
      
    public static void main(String[] args) {  
        MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil.getAddresses("10.11.15.222:10000"));  
        MemcachedClient memcachedClient;  
        try {  
            memcachedClient = builder.build();  
            memcachedClient.set("hello", 0, "Hello,xmemcached");  
            String value = memcachedClient.get("hello");  
            System.out.println("hello=" + value);  
            memcachedClient.delete("hello");  
            value = memcachedClient.get("hello");  
            System.out.println("hello=" + value);  
            // close memcached client  
            memcachedClient.shutdown();  
        } catch (MemcachedException e) {  
            System.err.println("MemcachedClient operation fail");  
            e.printStackTrace();  
        } catch (TimeoutException e) {  
            System.err.println("MemcachedClient operation timeout");  
            e.printStackTrace();  
        } catch (InterruptedException e) {  
            // ignore  
        } catch (IOException e) {  
            System.err.println("Shutdown MemcachedClient fail");  
            e.printStackTrace();  
  
        }  
  
    }  
  
}  

 

参考:

http://blog.csdn.net/xuke6677/article/details/38706501

http://blog.csdn.net/hardy008/article/details/37738901

http://blog.csdn.net/arui_email/article/details/8129400

http://blog.csdn.net/heiyueya/article/details/64441901

http://exceptioneye.iteye.com/blog/1927741

http://blog.csdn.net/hengyunabc/article/details/20735701(缓存失效后的策略处理)

posted @ 2017-10-03 23:41  EasonJim  阅读(5097)  评论(0编辑  收藏  举报