Spring整合xmemcached过程

XMemcached是一个基于Java nio的memcached客户端。

它是线程安全，结构简单，支持所有的memcached文本协议和二进制协议，并且有比较优异的性能表现。还支持一些高级特性，如JMX、动态增删节点、客户端统计以及nio连接池等。

整合开始前，先确认有一个或多个可用的Memcached服务，XMemcached支持集群及服务的权重配置。

文章参考：

1. http://code.google.com/p/xmemcached/

2. http://code.google.com/p/xmemcached/wiki/Spring_Integration

 

1. 项目使用maven管理，那么请在pom.xml里边添加Xmemcached的依赖包：

1 <dependency

2     <groupId>com.googlecode.xmemcached</groupId>

3     <artifactId>xmemcached</artifactId>

4     <version>1.4.1</version>

5 </dependency>

2. 添加bean配置，自动装载到容器

 1 <bean id="propertyHolder" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

 2         <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />

 3         <property name="ignoreResourceNotFound" value="true" />

 4         <property name="locations">

 5             <list>

 6                 <value>classpath:conf/system.properties</value>

 7                 <value>classpath:conf/jdbc.properties</value>

 8                 <value>classpath:conf/memcached.properties</value>

 9             </list>

10         </property>

11 </bean>

12 

13 <bean id="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">

14         <constructor-arg>

15             <list>

16                 <bean class="java.net.InetSocketAddress">

17                     <constructor-arg>

18                             <value>${memcached.server.host}</value>

19                     </constructor-arg>

20                     <constructor-arg>

21                             <value>${memcached.server.port}</value>

22                     </constructor-arg>

23                 </bean>

24             </list>

25         </constructor-arg>

26         <constructor-arg>

27             <list>

28                 <value>${memcached.server.weight}</value>

29             </list>

30         </constructor-arg>

31         <property name="connectionPoolSize" value="${memcached.connectionPoolSize}" />

32         <property name="commandFactory">

33                 <bean class="net.rubyeye.xmemcached.command.TextCommandFactory"></bean>

34         </property>

35         <property name="sessionLocator">

36                 <bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"></bean>

37         </property>

38         <property name="transcoder">

39                 <bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />

40         </property>

41 </bean>

42 <bean id="memcachedClient" factory-bean="memcachedClientBuilder" factory-method="build" destroy-method="shutdown" />

3. memcached.properties 配置内容：

memcached.connectionPoolSize=50

memcached.failureMode=true

#server

memcached.server.host=127.0.0.1

memcached.server.port=11211

memcached.server.weight=1

4. 上面可以设置多台memcached服务器，并指定weight权重。XMemcachedClientBuilder 有两个参数，第一个参数是server配置的list，第二个参数是每台服务器的权重。如：

 1 <bean id="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">

 2         <constructor-arg>

 3             <list>

 4                 <bean class="java.net.InetSocketAddress">

 5                     <constructor-arg>

 6                             <value>${memcached.server1.host}</value>

 7                     </constructor-arg>

 8                     <constructor-arg>

 9                             <value>${memcached.server1.port}</value>

10                     </constructor-arg>

11                 </bean>

12                 <bean class="java.net.InetSocketAddress">

13                     <constructor-arg>

14                             <value>${memcached.server2.host}</value>

15                     </constructor-arg>

16                     <constructor-arg>

17                             <value>${memcached.server2.port}</value>

18                     </constructor-arg>

19                 </bean>

20             </list>

21         </constructor-arg>

22         <constructor-arg>

23             <list>

24                 <value>${memcached.server1.weight}</value>

25                 <value>${memcached.server2.weight}</value>

26             </list>

27         </constructor-arg>

28         <property name="connectionPoolSize" value="${memcached.connectionPoolSize}" />

29         <property name="commandFactory">

30                 <bean class="net.rubyeye.xmemcached.command.TextCommandFactory"></bean>

31         </property>

32         <property name="sessionLocator">

33                 <bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"></bean>

34         </property>

35         <property name="transcoder">

36                 <bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />

37         </property>

38     </bean>

相应properties配置变更为：

#server1

memcached.server1.host=127.0.0.1

memcached.server1.port=11211

memcached.server1.weight=1

#server2

memcached.server2.host=127.0.0.1

memcached.server2.port=11212

memcached.server2.weight=2

5. 下面简单提供了一份单台memcached服务器的存取操作及获取memcached状态信息的代码实例：

 1 /*

 2  * Copyright 2013 Alibaba.com All right reserved. This software is the

 3  * confidential and proprietary information of Alibaba.com ("Confidential

 4  * Information"). You shall not disclose such Confidential Information and shall

 5  * use it only in accordance with the terms of the license agreement you entered

 6  * into with Alibaba.com.

 7  */

 8 package com.yunos.tv.server.controller.web;

 9 

10 import java.net.InetSocketAddress;

11 import java.util.Iterator;

12 import java.util.Map;

13 import java.util.Map.Entry;

14 import java.util.concurrent.TimeoutException;

15 

16 import net.rubyeye.xmemcached.MemcachedClient;

17 import net.rubyeye.xmemcached.exception.MemcachedException;

18 

19 import org.springframework.beans.factory.annotation.Autowired;

20 import org.springframework.stereotype.Controller;

21 import org.springframework.web.bind.annotation.RequestMapping;

22 import org.springframework.web.bind.annotation.RequestMethod;

23 import org.springframework.web.bind.annotation.ResponseBody;

24 

25 /**

26  * 类DemoController.java的实现描述：TODO 类实现描述

27  * @author riqi 2013-6-28 上午10:48:58

28  */

29 

30 @Controller

31 @RequestMapping(value = "/demo")

32 public class DemoController extends BaseController {

33 

34     @Autowired

35     private MemcachedClient memcachedClient;

36 

37     @SuppressWarnings("unchecked")

38     @ResponseBody

39     @RequestMapping(value = "/hello", method = RequestMethod.GET)

40     public String helloWorld() {

41         try {

42             memcachedClient.set("string", 3600, "Hello World!");

43             Map<InetSocketAddress, Map<String, String>> memcachedStats = memcachedClient.getStats();

44 

45             String helloWord = memcachedClient.get("string");

46             StringBuilder strBuilder = new StringBuilder(helloWord);

47             strBuilder.append("\n");

48 

49             for (Iterator<?> statsIterator = memcachedStats.entrySet().iterator(); statsIterator.hasNext();) {

50                 Map.Entry<InetSocketAddress, Map<String, String>> entry = (Entry<InetSocketAddress, Map<String, String>>) statsIterator.next();

51 

52                 strBuilder.append(entry.getKey() + ":" + entry.getValue());

53                 strBuilder.append("\n");

54             }

55 

56             return strBuilder.toString();

57 

58         } catch (TimeoutException e) {

59             e.printStackTrace();

60         } catch (InterruptedException e) {

61             e.printStackTrace();

62         } catch (MemcachedException e) {

63             e.printStackTrace();

64         }

65 

66         return "";

67     }

68 }

浏览器输入：http://localhost:8080/demo/hello.htm

输出内容：

Hello World! 

/127.0.0.1:11211:{delete_hits=0, bytes=68, total_items=62, listen_disabled_num=0, auth_errors=0, evictions=0, version=1.4.4-14-g9c660c0, pointer_size=32, time=1373528740, incr_hits=0, threads=4, limit_maxbytes=67108864, bytes_read=169146, curr_connections=109, get_misses=0, bytes_written=2559445, connection_structures=110, cas_hits=0, delete_misses=0, total_connections=310, cmd_flush=0, uptime=1426, pid=6312, cas_badval=0, get_hits=61, curr_items=1, cas_misses=0, accepting_conns=1, cmd_get=61, cmd_set=62, incr_misses=0, auth_cmds=0, decr_misses=0, decr_hits=0, conn_yields=0}