• Memcached理解笔2---XMemcached&Spring集成

    一、Memcached Client简要介绍 
    Memcached Client目前有3种： 


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


    XML配置文件： 

    Xml代码  收藏代码
    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： 

    Java代码  收藏代码
      1. import static junit.framework.Assert.*;  
      2.   
      3. import java.util.concurrent.TimeoutException;  
      4.   
      5. import net.rubyeye.xmemcached.MemcachedClient;  
      6. import net.rubyeye.xmemcached.exception.MemcachedException;  
      7.   
      8. import org.junit.Before;  
      9. import org.junit.Test;  
      10. import org.springframework.context.ApplicationContext;  
      11. import org.springframework.context.support.ClassPathXmlApplicationContext;  
      12.   
      13. public class MemcachedSpringTest {  
      14.   
      15.     private ApplicationContext app;  
      16.     private MemcachedClient memcachedClient;  
      17.   
      18.     @Before  
      19.     public void init() {  
      20.         app = new ClassPathXmlApplicationContext("applicationContext.xml");  
      21.         memcachedClient = (MemcachedClient) app.getBean("memcachedClient");  
      22.     }  
      23.   
      24.     @Test  
      25.     public void test() {  
      26.         try {  
      27.             // 设置/获取  
      28.             memcachedClient.set("zlex", 36000, "set/get");  
      29.             assertEquals("set/get", memcachedClient.get("zlex"));  
      30.   
      31.             // 替换  
      32.             memcachedClient.replace("zlex", 36000, "replace");  
      33.             assertEquals("replace", memcachedClient.get("zlex"));  
      34.   
      35.             // 移除  
      36.             memcachedClient.delete("zlex");  
      37.             assertNull(memcachedClient.get("zlex"));  
      38.         } catch (TimeoutException e) {  
      39.             // TODO Auto-generated catch block  
      40.             e.printStackTrace();  
      41.         } catch (InterruptedException e) {  
      42.             // TODO Auto-generated catch block  
      43.             e.printStackTrace();  
      44.         } catch (MemcachedException e) {  
      45.             // TODO Auto-generated catch block  
      46.             e.printStackTrace();  
      47.         }  
      48.     }  
      49. }  

    转载地址：http://snowolf.iteye.com/blog/1471805
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  • 原文地址：https://www.cnblogs.com/peijie-tech/p/3849432.html
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