Java的Memcached客户端

1.memcached client for java

http://www.whalin.com/memcached

Java代码







import com.danga.MemCached.*;
import org.apache.log4j.*;
public class TestMemcached {
public static void main(String[] args) {
/*初始化SockIOPool，管理memcached的连接池*/
String[] servers = { "192.168.1.20:12111" };
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 < 10; 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));
}
}
}

import com.danga.MemCached.*;
import org.apache.log4j.*;
public class TestMemcached {
public static void main(String[] args) {
/*初始化SockIOPool，管理memcached的连接池*/
String[] servers = { "192.168.1.20:12111" };
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 < 10; 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));
}
}
}

2.spymemcached

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

用spymemcached将对象存入缓存

Java代码







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("192.168.1.20", 12111));

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("neea:testDaF:ksIdno", 900, "someObject");
if(b.get().booleanValue()==true){
mc.shutdown();
}
}
catch(Exception ex){
ex.printStackTrace();
}
}
}

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("192.168.1.20", 12111));
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("neea:testDaF:ksIdno", 900, "someObject");
if(b.get().booleanValue()==true){
mc.shutdown();
}
}
catch(Exception ex){
ex.printStackTrace();
}
}
}

用spymemcached从缓存中取得对象

Java代码







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("192.168.1.20", 12111));

/*按照key值从memcached中查找缓存，不存在则返回null */
Object b = mc.get("neea:testDaF:ksIdno ");
mc.shutdown();
}
catch(Exception ex){
ex.printStackTrace();
}
}
}

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("192.168.1.20", 12111));
/*按照key值从memcached中查找缓存，不存在则返回null */
Object b = mc.get("neea:testDaF:ksIdno ");
mc.shutdown();
}
catch(Exception ex){
ex.printStackTrace();
}
}
}

以上两种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.

3. Xmemcached

http://code.google.com/p/xmemcached/

引用

Xmemcached是基于java nio实现的高性能可扩展的memcached客户端。

实际上是基于我实现的一个nio框架 http://code.google.com/p/yanf4j/的基础上实现的(目前1.1.3是基于yanf4j 0.7.0，而1.2.0-RC1版本基于1.0-SNAPSHOT)。