memcached+spring整合

Pom文件pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.citi.learn</groupId>
		<artifactId>learn</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>learn-memcached</artifactId>
	<packaging>war</packaging>
	<name>learn-memcached</name>
	<description>learn-memcached</description>

	<properties>
		<org.springframework.version>3.2.3.RELEASE</org.springframework.version>
	</properties>

	<dependencies>
		<!-- junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
		</dependency>

		<!-- Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>

		<!-- memcached -->
		<!-- <dependency> <groupId>com.google.code.maven-play-plugin.spy</groupId> 
			<artifactId>memcached</artifactId> <version>2.4.2</version> </dependency> -->
		<dependency>
			<groupId>com.googlecode.xmemcached</groupId>
			<artifactId>xmemcached</artifactId>
			<version>2.0.0</version>
		</dependency>


	</dependencies>
</project>

memcached.properties文件

#连接池大小即客户端个数 
memcached.connectionPoolSize=50
#宕机报警
memcached.failureMode=true
#server1
memcached.server1.host=vm-09b7-b009.apac.nsroot.net
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		

Spring配置文件spring_commons.xml

<?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:mongo="http://www.springframework.org/schema/data/mongo"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context-3.0.xsd
          http://www.springframework.org/schema/data/mongo
          http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
          http://www.springframework.org/schema/tx 
          http://www.springframework.org/schema/tx/spring-tx.xsd
          http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans.xsd">

	<context:property-placeholder location="classpath*:memcached.properties" />

	<bean name="memcachedClient"
		class="net.rubyeye.xmemcached.utils.XMemcachedClientFactoryBean"
		destroy-method="shutdown">
		<property name="servers">
			<value>
				${memcached.server1.host}:${memcached.server1.port}
				<!-- ${memcached.server2.host}:${memcached.server2.port} ${memcached.server3.host}:${memcached.server3.port} 
					${memcached.server4.host}:${memcached.server4.port} -->
			</value>
		</property>
		<!-- server's weights -->
		<property name="weights">
			<list>
				<value>${memcached.server1.weight}</value>
				<!-- <value>${memcached.server2.weight}</value> <value>${memcached.server3.weight}</value> 
					<value>${memcached.server4.weight}</value> -->
			</list>
		</property>
		<property name="failureMode" value="${memcahed.failureMode}"></property>
		<!-- nio connection pool size -->
		<property name="connectionPoolSize" value="${memcached.connectionPoolSize}" />
		
		<!--使用二进制文件模式  Use binary protocol,default is TextCommandFactory -->
		<property name="commandFactory">
			<bean class="net.rubyeye.xmemcached.command.BinaryCommandFactory"></bean>
		</property>
		<!-- 使用一致性哈希算法 Distributed strategy -->
		<property name="sessionLocator">
			<bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"></bean>
		</property>
		<!-- 使用序列化传输编码 Serializing transcoder -->
		<property name="transcoder">
			<bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
		</property>
		<!-- ByteBuffer allocator -->
		<property name="bufferAllocator">
			<bean class="net.rubyeye.xmemcached.buffer.SimpleBufferAllocator"></bean>
		</property>
	</bean>
</beans>

测试类

package com.memcached.test;

import static org.junit.Assert.*;
import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

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;

public class MemcachedClientTest {
	private ApplicationContext ctx;
	private MemcachedClient memcachedClient;

	@Before
	public void init() {
		ctx = new ClassPathXmlApplicationContext("spring_commons.xml");
		memcachedClient = (MemcachedClient) ctx.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();
		} finally {
			if (memcachedClient != null) {
				try {
					memcachedClient.shutdown();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
}

 
    
    MemcachedClientBuilder核心接口，用来控制Client的构建（build()方法）和关闭（shutdown()方法）。 MemcachedClient 由spring注入,不需要重复调用build()跟shutdown()方法，这些操作交给Spring来完成。

总结

• Memcached的Key，要杜绝使用空格，且长度控制在250个字符。
• Memcached的Value，要控制体积，必须小于1MB，必要时进行使用压缩。
• 失效时间，0为永久有效，最大值不得超过30天（2592000s），否则重新计算可能缓存只有1秒
• Memcached仅支持LRU算法，完全适用你的需要。
• 尽量不要将List这种重体积对象扔到Memcached中，传输、存储都会产生瓶颈。
• 使用一致性哈希算法实现，提高多个Memcacehd Server利用率。