Memcached笔记——（二）XMemcached&Spring集成

今天研究Memcached的Java的Client，使用XMemcached 1.3.5，做个简单的测试，并介绍如何与Spring集成。

相关链接：
Memcached笔记——（一）安装&常规错误&监控
Memcached笔记——（二）XMemcached&Spring集成
Memcached笔记——（三）Memcached使用总结
Memcached笔记——（四）应对高并发攻击


一、Memcached Client简要介绍
Memcached Client目前有3种：

• Memcached Client for Java
• SpyMemcached
• XMemcached

这三种Client一直存在各种争议：

• Memcached Client for Java 比 SpyMemcached更稳定、更早、更广泛；
• SpyMemcached 比 Memcached Client for Java更高效；
• XMemcached 比 SpyMemcache并发效果更好。

用数据来说话，参考官方性能对比：
Memcached Client for Java：https://github.com/gwhalin/Memcached-Java-Client/wiki/PERFORMANCE
XMemcached：http://xmemcached.googlecode.com/svn/trunk/benchmark/benchmark.html

二、XMemcached特性
XMemcached特性：

• 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。

此外，XMemcached更容易与Spring集成。而且，属于中国原创！

三、XMemcached简单实现

MemcachedClientBuilder是MemcachedClient核心接口，用来控制Client的构建（build()方法）和关闭（shutdown()方法）。
XMemcachedClientBuilder一般通过构造方法配置地址列表，通常还要配置权重，代码如下：

public XMemcachedClientBuilder(List<InetSocketAddress> addressList) {if (addressList != null) {for (InetSocketAddress addr : addressList) {this.addressMap.put(addr, null);}}}public XMemcachedClientBuilder(List<InetSocketAddress> addressList,int[] weights) {if (addressList != null) {for (InetSocketAddress addr : addressList) {this.addressMap.put(addr, null);}}this.weights = weights;}

不过这哥们如果用this()可以省点代码，还有给加点注释吧！
此外，还需要设置连接池大小，使用二进制协议/文本协议等。
通过build()方法获得MemcachedClient
然后就可以通过Memcached进行set、get、replace、delete等Memcached操作了！
上代码：

import static junit.framework.Assert.*;import java.io.IOException;import java.util.concurrent.TimeoutException;import net.rubyeye.xmemcached.MemcachedClient;import net.rubyeye.xmemcached.MemcachedClientBuilder;import net.rubyeye.xmemcached.XMemcachedClientBuilder;import net.rubyeye.xmemcached.command.BinaryCommandFactory;import net.rubyeye.xmemcached.exception.MemcachedException;import net.rubyeye.xmemcached.utils.AddrUtil;import org.junit.Test;public class MemcachedClientTest {@Testpublic void test() {MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil.getAddresses("10.11.155.26:11211 10.11.155.41:11211 10.10.76.31:11211 10.10.76.35:11211"),new int[] { 1, 1, 1, 1 });// 设置连接池大小，即客户端个数builder.setConnectionPoolSize(50);// 宕机报警builder.setFailureMode(true);// 使用二进制文件builder.setCommandFactory(new BinaryCommandFactory());MemcachedClient memcachedClient = null;try {memcachedClient = builder.build();try {// 设置/获取memcachedClient.set("zlex", 36000, "set/get");assertEquals("set/get", memcachedClient.get("zlex"));// 替换memcachedClient.replace("zlex", 36000, "replace");assertEquals("replace", memcachedClient.get("zlex"));// 移除memcachedClient.delete("zlex");assertNull(memcachedClient.get("zlex"));} catch (TimeoutException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (MemcachedException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (memcachedClient != null) {try {memcachedClient.shutdown();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}

四、XMemcached与Spring集成
XMemcached与Spring集成可以参考http://code.google.com/p/xmemcached/wiki/Spring_Integration，这里只说最常用的方法。
memcached.properties做基本配置：

#连接池大小即客户端个数memcached.connectionPoolSize=50memcached.failureMode=true#server1memcached.server1.host=10.11.155.26memcached.server1.port=11211memcached.server1.weight=4#server2memcached.server2.host=10.11.155.41memcached.server2.port=11211memcached.server2.weight=3#server3memcached.server3.host=10.10.76.31memcached.server3.port=11211memcached.server3.weight=2#server4memcached.server4.host=10.10.76.35memcached.server4.port=11211memcached.server4.weight=1  

XML配置文件：

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"><!-- http://code.google.com/p/xmemcached/wiki/Spring_Integration --><context:property-placeholder location="memcached.properties" /><beanid="memcachedClientBuilder"class="net.rubyeye.xmemcached.XMemcachedClientBuilder"p:connectionPoolSize="${memcached.connectionPoolSize}"p:failureMode="${memcached.failureMode}"><!-- XMemcachedClientBuilder have two arguments.First is server list,and second is weights array. --><constructor-arg><list><bean class="java.net.InetSocketAddress"><constructor-arg><value>${memcached.server1.host}</value></constructor-arg><constructor-arg><value>${memcached.server1.port}</value></constructor-arg></bean><bean class="java.net.InetSocketAddress"><constructor-arg><value>${memcached.server2.host}</value></constructor-arg><constructor-arg><value>${memcached.server2.port}</value></constructor-arg></bean><bean class="java.net.InetSocketAddress"><constructor-arg><value>${memcached.server3.host}</value></constructor-arg><constructor-arg><value>${memcached.server3.port}</value></constructor-arg></bean><bean class="java.net.InetSocketAddress"><constructor-arg><value>${memcached.server4.host}</value></constructor-arg><constructor-arg><value>${memcached.server4.port}</value></constructor-arg></bean></list></constructor-arg><constructor-arg><list><value>${memcached.server1.weight}</value><value>${memcached.server2.weight}</value><value>${memcached.server3.weight}</value><value>${memcached.server4.weight}</value></list></constructor-arg><property name="commandFactory"><bean class="net.rubyeye.xmemcached.command.TextCommandFactory" /></property><property name="sessionLocator"><bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator" /></property><property name="transcoder"><bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" /></property></bean><!-- Use factory bean to build memcached client --><beanid="memcachedClient"factory-bean="memcachedClientBuilder"factory-method="build"destroy-method="shutdown" /></beans>

这里的memcachedClientBuilder节点完成MemcachedClientBuilder，然后通过memcachedClient节点配置factory-method，调用MemcachedClientBuilder的build()方法产生MemcachedClient，并配置destroy-method进行关闭。
不过我还是疑惑，这里的异常由谁来处理？Spring容器吗？ 或者需要另一个代理Bean包装一下？

有了Spring容器支持，我们不需要在代码中进行配置，也不需要重复调用build()跟shutdown()方法，这些操作交给Spring来完成。
代码如下：

import static junit.framework.Assert.*;import java.util.concurrent.TimeoutException;import net.rubyeye.xmemcached.MemcachedClient;import net.rubyeye.xmemcached.exception.MemcachedException;import org.junit.Before;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class MemcachedSpringTest {private ApplicationContext app;private MemcachedClient memcachedClient;@Beforepublic void init() {app = new ClassPathXmlApplicationContext("applicationContext.xml");memcachedClient = (MemcachedClient) app.getBean("memcachedClient");}@Testpublic void test() {try {// 设置/获取memcachedClient.set("zlex", 36000, "set/get");assertEquals("set/get", memcachedClient.get("zlex"));// 替换memcachedClient.replace("zlex", 36000, "replace");assertEquals("replace", memcachedClient.get("zlex"));// 移除memcachedClient.delete("zlex");assertNull(memcachedClient.get("zlex"));} catch (TimeoutException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (MemcachedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}