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 {

	@Test

	public 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 block

				e.printStackTrace();

			} catch (InterruptedException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			} catch (MemcachedException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} finally {

			if (memcachedClient != null) {

				try {

					memcachedClient.shutdown();

				} catch (IOException e) {

					// TODO Auto-generated catch block

					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：

<?xml version="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/beans http://www.springframework.org/schema/beans/spring-beans.xsd

		http://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" />

	<bean

		id="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 -->

	<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：

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;

	@Before

	public void init() {

		app = new ClassPathXmlApplicationContext("applicationContext.xml");

		memcachedClient = (MemcachedClient) app.getBean("memcachedClient");

	}

	@Test

	public 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 block

			e.printStackTrace();

		} catch (InterruptedException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (MemcachedException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

	}

}

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

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