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：

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

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：

1. import static junit.framework.Assert.*;
2. import java.io.IOException;
3. import java.util.concurrent.TimeoutException;
4. import net.rubyeye.xmemcached.MemcachedClient;
5. import net.rubyeye.xmemcached.MemcachedClientBuilder;
6. import net.rubyeye.xmemcached.XMemcachedClientBuilder;
7. import net.rubyeye.xmemcached.command.BinaryCommandFactory;
8. import net.rubyeye.xmemcached.exception.MemcachedException;
9. import net.rubyeye.xmemcached.utils.AddrUtil;
10. import org.junit.Test;
11. public class MemcachedClientTest {
12. @Test
13. public void test() {
14. MemcachedClientBuilder builder = new XMemcachedClientBuilder(
15. AddrUtil.getAddresses("10.11.155.26:11211 10.11.155.41:11211 10.10.76.31:11211 10.10.76.35:11211"),
16. new int[] { 1, 1, 1, 1 });
17. // 设置连接池大小，即客户端个数
18. builder.setConnectionPoolSize(50);
19. // 宕机报警
20. builder.setFailureMode(true);
21. // 使用二进制文件
22. builder.setCommandFactory(new BinaryCommandFactory());
23. MemcachedClient memcachedClient = null;
24. try {
25. memcachedClient = builder.build();
26. try {
27. // 设置/获取
28. memcachedClient.set("zlex", 36000, "set/get");
29. assertEquals("set/get", memcachedClient.get("zlex"));
30. // 替换
31. memcachedClient.replace("zlex", 36000, "replace");
32. assertEquals("replace", memcachedClient.get("zlex"));
33. // 移除
34. memcachedClient.delete("zlex");
35. assertNull(memcachedClient.get("zlex"));
36. } catch (TimeoutException e) {
37. // TODO Auto-generated catch block
38. e.printStackTrace();
39. } catch (InterruptedException e) {
40. // TODO Auto-generated catch block
41. e.printStackTrace();
42. } catch (MemcachedException e) {
43. // TODO Auto-generated catch block
44. e.printStackTrace();
45. }
46. } catch (IOException e) {
47. // TODO Auto-generated catch block
48. e.printStackTrace();
49. } finally {
50. if (memcachedClient != null) {
51. try {
52. memcachedClient.shutdown();
53. } catch (IOException e) {
54. // TODO Auto-generated catch block
55. e.printStackTrace();
56. }
57. }
58. }
59. }
60. }

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：

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：

1. <?xml version="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/beans http://www.springframework.org/schema/beans/spring-beans.xsd
8. http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
9. <!-- http://code.google.com/p/xmemcached/wiki/Spring_Integration -->
10. <context:property-placeholder location="memcached.properties" />
11. <bean
12. id="memcachedClientBuilder"
13. class="net.rubyeye.xmemcached.XMemcachedClientBuilder"
14. p:connectionPoolSize="${memcached.connectionPoolSize}"
15. p:failureMode="${memcached.failureMode}">
16. <!-- XMemcachedClientBuilder have two arguments.First is server list,and
17. second is weights array. -->
18. <constructor-arg>
19. <list>
20. <bean class="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. <bean class="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. <bean class="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. <bean class="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. <property name="commandFactory">
63. <bean class="net.rubyeye.xmemcached.command.TextCommandFactory" />
64. </property>
65. <property name="sessionLocator">
66. <bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator" />
67. </property>
68. <property name="transcoder">
69. <bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
70. </property>
71. </bean>
72. <!-- Use factory bean to build memcached client -->
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：

1. import static junit.framework.Assert.*;
2. import java.util.concurrent.TimeoutException;
3. import net.rubyeye.xmemcached.MemcachedClient;
4. import net.rubyeye.xmemcached.exception.MemcachedException;
5. import org.junit.Before;
6. import org.junit.Test;
7. import org.springframework.context.ApplicationContext;
8. import org.springframework.context.support.ClassPathXmlApplicationContext;
9. public class MemcachedSpringTest {
10. private ApplicationContext app;
11. private MemcachedClient memcachedClient;
12. @Before
13. public void init() {
14. app = new ClassPathXmlApplicationContext("applicationContext.xml");
15. memcachedClient = (MemcachedClient) app.getBean("memcachedClient");
16. }
17. @Test
18. public void test() {
19. try {
20. // 设置/获取
21. memcachedClient.set("zlex", 36000, "set/get");
22. assertEquals("set/get", memcachedClient.get("zlex"));
23. // 替换
24. memcachedClient.replace("zlex", 36000, "replace");
25. assertEquals("replace", memcachedClient.get("zlex"));
26. // 移除
27. memcachedClient.delete("zlex");
28. assertNull(memcachedClient.get("zlex"));
29. } catch (TimeoutException e) {
30. // TODO Auto-generated catch block
31. e.printStackTrace();
32. } catch (InterruptedException e) {
33. // TODO Auto-generated catch block
34. e.printStackTrace();
35. } catch (MemcachedException e) {
36. // TODO Auto-generated catch block
37. e.printStackTrace();
38. }
39. }
40. }

转载地址：http://snowolf.iteye.com/blog/1471805