Memcached笔记——（二）XMemcached&Spring集成

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：

publicXMemcachedClientBuilder(List<InetSocketAddress>addressList){
if(addressList!=null){
for(InetSocketAddressaddr:addressList){
this.addressMap.put(addr,null);
}
}
}

publicXMemcachedClientBuilder(List<InetSocketAddress>addressList,
int[]weights){
if(addressList!=null){
for(InetSocketAddressaddr: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：

importstaticjunit.framework.Assert.*;

importjava.io.IOException;
importjava.util.concurrent.TimeoutException;

importnet.rubyeye.xmemcached.MemcachedClient;
importnet.rubyeye.xmemcached.MemcachedClientBuilder;
importnet.rubyeye.xmemcached.XMemcachedClientBuilder;
importnet.rubyeye.xmemcached.command.BinaryCommandFactory;
importnet.rubyeye.xmemcached.exception.MemcachedException;
importnet.rubyeye.xmemcached.utils.AddrUtil;

importorg.junit.Test;

publicclassMemcachedClientTest{
@Test
publicvoidtest(){
MemcachedClientBuilderbuilder=newXMemcachedClientBuilder(
AddrUtil.getAddresses("10.11.155.26:1121110.11.155.41:1121110.10.76.31:1121110.10.76.35:11211"),
newint[]{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(newBinaryCommandFactory());

MemcachedClientmemcachedClient=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(TimeoutExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(InterruptedExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(MemcachedExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}

}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}finally{
if(memcachedClient!=null){
try{
memcachedClient.shutdown();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.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=50
memcached.failureMode=true
#server1
memcached.server1.host=10.11.155.26
memcached.server1.port=11211
memcached.server1.weight=4
#server2
memcached.server2.host=10.11.155.41
memcached.server2.port=11211
memcached.server2.weight=3
#server3
memcached.server3.host=10.10.76.31
memcached.server3.port=11211
memcached.server3.weight=2
#server4
memcached.server4.host=10.10.76.35
memcached.server4.port=11211
memcached.server4.weight=1

XML配置文件：

<?xmlversion="1.0"encoding="UTF-8"?>
<beans
xmlns="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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd">
<!--http://code.google.com/p/xmemcached/wiki/Spring_Integration-->
<context:property-placeholderlocation="memcached.properties"/>
<bean
id="memcachedClientBuilder"
class="net.rubyeye.xmemcached.XMemcachedClientBuilder"
p:connectionPoolSize="${memcached.connectionPoolSize}"
p:failureMode="${memcached.failureMode}">
<!--XMemcachedClientBuilderhavetwoarguments.Firstisserverlist,and
secondisweightsarray.-->
<constructor-arg>
<list>
<beanclass="java.net.InetSocketAddress">
<constructor-arg>
<value>${memcached.server1.host}</value>
</constructor-arg>
<constructor-arg>
<value>${memcached.server1.port}</value>
</constructor-arg>
</bean>
<beanclass="java.net.InetSocketAddress">
<constructor-arg>
<value>${memcached.server2.host}</value>
</constructor-arg>
<constructor-arg>
<value>${memcached.server2.port}</value>
</constructor-arg>
</bean>
<beanclass="java.net.InetSocketAddress">
<constructor-arg>
<value>${memcached.server3.host}</value>
</constructor-arg>
<constructor-arg>
<value>${memcached.server3.port}</value>
</constructor-arg>
</bean>
<beanclass="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>
<propertyname="commandFactory">
<beanclass="net.rubyeye.xmemcached.command.TextCommandFactory"/>
</property>
<propertyname="sessionLocator">
<beanclass="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"/>
</property>
<propertyname="transcoder">
<beanclass="net.rubyeye.xmemcached.transcoders.SerializingTranscoder"/>
</property>
</bean>
<!--Usefactorybeantobuildmemcachedclient-->
<bean
id="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：

importstaticjunit.framework.Assert.*;

importjava.util.concurrent.TimeoutException;

importnet.rubyeye.xmemcached.MemcachedClient;
importnet.rubyeye.xmemcached.exception.MemcachedException;

importorg.junit.Before;
importorg.junit.Test;
importorg.springframework.context.ApplicationContext;
importorg.springframework.context.support.ClassPathXmlApplicationContext;

publicclassMemcachedSpringTest{

privateApplicationContextapp;
privateMemcachedClientmemcachedClient;

@Before
publicvoidinit(){
app=newClassPathXmlApplicationContext("applicationContext.xml");
memcachedClient=(MemcachedClient)app.getBean("memcachedClient");
}

@Test
publicvoidtest(){
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(TimeoutExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(InterruptedExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(MemcachedExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}