Memcached Client简要介绍

huiselele · 发表于 2015-11-19 07:31:08

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">
<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>
<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();
}
}
}

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