使用java5的注解和Sping/AspectJ的AOP 来实现Memcached的缓存

使用java5的注解和Sping/AspectJ的AOP 来实现Memcached的缓存

今天要介绍的是Simple-Spring-Memcached，它封装了对MemCached的调用，使MemCached的客户端开发变得超乎寻常的简单，只要一行代码就行：

@ReadThroughAssignCache(assignedKey = "VETS", expiration = 300, namespace = "NELZ")

是不是很神奇？这行代码指定了MemCached的key，过期时间和命名空间。假设你的MemCached服务器IP是：196.168.10.101，端口是：12000，那么在数据调用的配置文件中只要加上下面配置代码就可以了：

 

 1 <import resource="classpath:simplesm-context.xml" />
 5   <bean id="memcachedConnectionBean" class="net.nelz.simplesm.config.MemcachedConnectionBean">
 7     <property name="consistentHashing" value="true" />
 9     <property name="nodeList" value="196.168.10.101:12000" />
 5   </bean>
  

从simplesm-context.xml的内容中，可以看出它所封装的类和方法：

 

  1   <bean id="memcachedClientFactory" class="net.nelz.simplesm.config.MemcachedClientFactory" >
  3     property name="bean" ref="memcachedConnectionBean" />
  5   </bean>
  9   <bean id="memcachedClient" factory-bean="memcachedClientFactory" factory-method="createMemcachedClient" />
 13    <bean id="methodStore" class="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl" />
 17   <bean id="net.nelz.simplesm.DefaultKeyProvider" class="net.nelz.simplesm.impl.DefaultKeyProvider">
 19     <property name="methodStore" ref="methodStore" />
 21   </bean>
 25   <bean id="readThroughSingleCache" class="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice">
 27     <property name="cache" ref="memcachedClient" />
 29     <property name="methodStore" ref="methodStore" />
 31     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 33   </bean>
 35   <bean id="readThroughMultiCache" class="net.nelz.simplesm.aop.ReadThroughMultiCacheAdvice">
 37     <property name="cache" ref="memcachedClient" />
 39     <property name="methodStore" ref="methodStore" />
 41     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 43   </bean>
 45   <bean id="readThroughAssignCache" class="net.nelz.simplesm.aop.ReadThroughAssignCacheAdvice">
 47     <property name="cache" ref="memcachedClient" />
 49     <property name="methodStore" ref="methodStore" />
 51     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 53   </bean>
 54 
 55   <bean id="updateSingleCache" class="net.nelz.simplesm.aop.UpdateSingleCacheAdvice">
 57     <property name="cache" ref="memcachedClient" />
 59     <property name="methodStore" ref="methodStore" />
 61     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 63   </bean>
 64 
 65   <bean id="updateMultiCache" class="net.nelz.simplesm.aop.UpdateMultiCacheAdvice">
 67     <property name="cache" ref="memcachedClient" />
 69     <property name="methodStore" ref="methodStore" />
 71     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 73   </bean>
 75   <bean id="updateAssignCache" class="net.nelz.simplesm.aop.UpdateAssignCacheAdvice">
 77     <property name="cache" ref="memcachedClient" />
 79     <property name="methodStore" ref="methodStore" />
 81     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 83   </bean>
 85   <bean id="invalidateSingleCache" class="net.nelz.simplesm.aop.InvalidateSingleCacheAdvice">
 87     <property name="cache" ref="memcachedClient" />
 89     <property name="methodStore" ref="methodStore" />
 91     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
 93   </bean>
 95   <bean id="invalidateMultiCache" class="net.nelz.simplesm.aop.InvalidateMultiCacheAdvice">
 97     <property name="cache" ref="memcachedClient" />
 99     <property name="methodStore" ref="methodStore" />
101     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
103   </bean>






105   <bean id="invalidateAssignCache" class="net.nelz.simplesm.aop.InvalidateAssignCacheAdvice">
107     <property name="cache" ref="memcachedClient" />
109     <property name="methodStore" ref="methodStore" />
111     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
113   </bean>
 

Simple-Spring-Memcached还提供了一个例子，在spring的petClinic例子中加入了几行代码，就实现了对MemCached的调用：

 

 1 import net.nelz.simplesm.annotations.ReadThroughAssignCache;
 2 
 3 import net.nelz.simplesm.annotations.ReadThroughSingleCache;
 4 
 5 @ReadThroughAssignCache(assignedKey = "VETS", expiration = 300, namespace = "NELZ")
 6 
 7     public Collection<Vet> getVets() {
 8 
 9         System.out.println("
 ! ! !Gonna wait a bit: " + new Date() + "
");        
10 
11         try {
12 
13             Thread.sleep(4000);
14 
15         } catch (Exception ex) {}
16 
17         return sessionFactory.getCurrentSession().createQuery("from Vet vet order by vet.lastName, vet.firstName").list();
18 
19          }
  

为了加强测试的效果，在第一次读取数据时，故意停顿了一下(sleep)。
转载自:http://www.blogjava.net/hao446tian/archive/2012/04/10/373725.html

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