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#server1memcached.server1.host=vm-09b7-b009.apac.nsroot.netmemcached.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

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

1. 1. 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。