Memcached笔记——（二）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

1. publicXMemcachedClientBuilder(List<InetSocketAddress>addressList){
2. if(addressList!=null){
3. for(InetSocketAddressaddr:addressList){
4. this.addressMap.put(addr,null);
5. }
6. }
7. }
9. publicXMemcachedClientBuilder(List<InetSocketAddress>addressList,
10. int[]weights){
11. if(addressList!=null){
12. for(InetSocketAddressaddr:addressList){
13. this.addressMap.put(addr,null);
14. }
15. }
16. this.weights=weights;
17. }

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

1. importstaticjunit.framework.Assert.*;
3. importjava.io.IOException;
4. importjava.util.concurrent.TimeoutException;
6. importnet.rubyeye.xmemcached.MemcachedClient;
7. importnet.rubyeye.xmemcached.MemcachedClientBuilder;
8. importnet.rubyeye.xmemcached.XMemcachedClientBuilder;
9. importnet.rubyeye.xmemcached.command.BinaryCommandFactory;
10. importnet.rubyeye.xmemcached.exception.MemcachedException;
11. importnet.rubyeye.xmemcached.utils.AddrUtil;
13. importorg.junit.Test;
15. publicclassMemcachedClientTest{
16. @Test
17. publicvoidtest(){
18. MemcachedClientBuilderbuilder=newXMemcachedClientBuilder(
19. AddrUtil.getAddresses("10.11.155.26:1121110.11.155.41:1121110.10.76.31:1121110.10.76.35:11211"),
20. newint[]{1,1,1,1});
22. //设置连接池大小，即客户端个数
23. builder.setConnectionPoolSize(50);
25. //宕机报警
26. builder.setFailureMode(true);
28. //使用二进制文件
29. builder.setCommandFactory(newBinaryCommandFactory());
31. MemcachedClientmemcachedClient=null;
32. try{
33. memcachedClient=builder.build();
34. try{
35. //设置/获取
36. memcachedClient.set("zlex",36000,"set/get");
37. assertEquals("set/get",memcachedClient.get("zlex"));
39. //替换
40. memcachedClient.replace("zlex",36000,"replace");
41. assertEquals("replace",memcachedClient.get("zlex"));
43. //移除
44. memcachedClient.delete("zlex");
45. assertNull(memcachedClient.get("zlex"));
46. }catch(TimeoutExceptione){
47. //TODOAuto-generatedcatchblock
48. e.printStackTrace();
49. }catch(InterruptedExceptione){
50. //TODOAuto-generatedcatchblock
51. e.printStackTrace();
52. }catch(MemcachedExceptione){
53. //TODOAuto-generatedcatchblock
54. e.printStackTrace();
55. }
57. }catch(IOExceptione){
58. //TODOAuto-generatedcatchblock
59. e.printStackTrace();
60. }finally{
61. if(memcachedClient!=null){
62. try{
63. memcachedClient.shutdown();
64. }catch(IOExceptione){
65. //TODOAuto-generatedcatchblock
66. e.printStackTrace();
67. }
68. }
69. }
70. }
71. }

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

1. #连接池大小即客户端个数
2. memcached.connectionPoolSize=50
3. memcached.failureMode=true
4. #server1
5. memcached.server1.host=10.11.155.26
6. memcached.server1.port=11211
7. memcached.server1.weight=4
8. #server2
9. memcached.server2.host=10.11.155.41
10. memcached.server2.port=11211
11. memcached.server2.weight=3
12. #server3
13. memcached.server3.host=10.10.76.31
14. memcached.server3.port=11211
15. memcached.server3.weight=2
16. #server4
17. memcached.server4.host=10.10.76.35
18. memcached.server4.port=11211
19. memcached.server4.weight=1

XML配置文件：

Xml代码

1. <?xmlversion="1.0"encoding="UTF-8"?>
2. <beans
3. xmlns="http://www.springframework.org/schema/beans"
4. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5. xmlns:context="http://www.springframework.org/schema/context"
6. xmlns:p="http://www.springframework.org/schema/p"
7. xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd
8. http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd">
9. <!--http://code.google.com/p/xmemcached/wiki/Spring_Integration-->
10. <context:property-placeholderlocation="memcached.properties"/>
11. <bean
12. id="memcachedClientBuilder"
13. class="net.rubyeye.xmemcached.XMemcachedClientBuilder"
14. p:connectionPoolSize="${memcached.connectionPoolSize}"
15. p:failureMode="${memcached.failureMode}">
16. <!--XMemcachedClientBuilderhavetwoarguments.Firstisserverlist,and
17. secondisweightsarray.-->
18. <constructor-arg>
19. <list>
20. <beanclass="java.net.InetSocketAddress">
21. <constructor-arg>
22. <value>${memcached.server1.host}</value>
23. </constructor-arg>
24. <constructor-arg>
25. <value>${memcached.server1.port}</value>
26. </constructor-arg>
27. </bean>
28. <beanclass="java.net.InetSocketAddress">
29. <constructor-arg>
30. <value>${memcached.server2.host}</value>
31. </constructor-arg>
32. <constructor-arg>
33. <value>${memcached.server2.port}</value>
34. </constructor-arg>
35. </bean>
36. <beanclass="java.net.InetSocketAddress">
37. <constructor-arg>
38. <value>${memcached.server3.host}</value>
39. </constructor-arg>
40. <constructor-arg>
41. <value>${memcached.server3.port}</value>
42. </constructor-arg>
43. </bean>
44. <beanclass="java.net.InetSocketAddress">
45. <constructor-arg>
46. <value>${memcached.server4.host}</value>
47. </constructor-arg>
48. <constructor-arg>
49. <value>${memcached.server4.port}</value>
50. </constructor-arg>
51. </bean>
52. </list>
53. </constructor-arg>
54. <constructor-arg>
55. <list>
56. <value>${memcached.server1.weight}</value>
57. <value>${memcached.server2.weight}</value>
58. <value>${memcached.server3.weight}</value>
59. <value>${memcached.server4.weight}</value>
60. </list>
61. </constructor-arg>
62. <propertyname="commandFactory">
63. <beanclass="net.rubyeye.xmemcached.command.TextCommandFactory"/>
64. </property>
65. <propertyname="sessionLocator">
66. <beanclass="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"/>
67. </property>
68. <propertyname="transcoder">
69. <beanclass="net.rubyeye.xmemcached.transcoders.SerializingTranscoder"/>
70. </property>
71. </bean>
72. <!--Usefactorybeantobuildmemcachedclient-->
73. <bean
74. id="memcachedClient"
75. factory-bean="memcachedClientBuilder"
76. factory-method="build"
77. destroy-method="shutdown"/>
78. </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

1. importstaticjunit.framework.Assert.*;
3. importjava.util.concurrent.TimeoutException;
5. importnet.rubyeye.xmemcached.MemcachedClient;
6. importnet.rubyeye.xmemcached.exception.MemcachedException;
8. importorg.junit.Before;
9. importorg.junit.Test;
10. importorg.springframework.context.ApplicationContext;
11. importorg.springframework.context.support.ClassPathXmlApplicationContext;
13. publicclassMemcachedSpringTest{
15. privateApplicationContextapp;
16. privateMemcachedClientmemcachedClient;
18. @Before
19. publicvoidinit(){
20. app=newClassPathXmlApplicationContext("applicationContext.xml");
21. memcachedClient=(MemcachedClient)app.getBean("memcachedClient");
22. }
24. @Test
25. publicvoidtest(){
26. try{
27. //设置/获取
28. memcachedClient.set("zlex",36000,"set/get");
29. assertEquals("set/get",memcachedClient.get("zlex"));
31. //替换
32. memcachedClient.replace("zlex",36000,"replace");
33. assertEquals("replace",memcachedClient.get("zlex"));
35. //移除
36. memcachedClient.delete("zlex");
37. assertNull(memcachedClient.get("zlex"));
38. }catch(TimeoutExceptione){
39. //TODOAuto-generatedcatchblock
40. e.printStackTrace();
41. }catch(InterruptedExceptione){
42. //TODOAuto-generatedcatchblock
43. e.printStackTrace();
44. }catch(MemcachedExceptione){
45. //TODOAuto-generatedcatchblock
46. e.printStackTrace();
47. }
48. }
49. }