Memcached理解笔2---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：
Java代码
[*]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：
Java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：
Properties代码
[*]#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代码
[*]<?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：
Java代码
[*]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();
[*] }
[*] }
[*]}
转载地址：http://snowolf.iteye.com/blog/1471805
页:
[1]