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 = , 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：，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：

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

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

     <bean id="memcachedClientFactory" class="net.nelz.simplesm.config.MemcachedClientFactory" >
       property name="bean" ref="memcachedConnectionBean" />
     </bean>
     <bean id="memcachedClient" factory-bean="memcachedClientFactory" factory-method="createMemcachedClient" />
     <bean id="methodStore" class="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl" />
    <bean id="net.nelz.simplesm.DefaultKeyProvider" class="net.nelz.simplesm.impl.DefaultKeyProvider">
      <property name="methodStore" ref="methodStore" />
    </bean>
    <bean id="readThroughSingleCache" class="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>
    <bean id="readThroughMultiCache" class="net.nelz.simplesm.aop.ReadThroughMultiCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>
    <bean id="readThroughAssignCache" class="net.nelz.simplesm.aop.ReadThroughAssignCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>

    <bean id="updateSingleCache" class="net.nelz.simplesm.aop.UpdateSingleCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>

    <bean id="updateMultiCache" class="net.nelz.simplesm.aop.UpdateMultiCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>
    <bean id="updateAssignCache" class="net.nelz.simplesm.aop.UpdateAssignCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>
    <bean id="invalidateSingleCache" class="net.nelz.simplesm.aop.InvalidateSingleCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
      <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
    </bean>
    <bean id="invalidateMultiCache" class="net.nelz.simplesm.aop.InvalidateMultiCacheAdvice">
      <property name="cache" ref="memcachedClient" />
      <property name="methodStore" ref="methodStore" />
     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
   </bean>

   <bean id="invalidateAssignCache" class="net.nelz.simplesm.aop.InvalidateAssignCacheAdvice">
     <property name="cache" ref="memcachedClient" />
     <property name="methodStore" ref="methodStore" />
     <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
   </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：

  import net.nelz.simplesm.annotations.ReadThroughAssignCache;

  import net.nelz.simplesm.annotations.ReadThroughSingleCache;

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

      public Collection<Vet> getVets() {

          System.out.println("\n ! ! !Gonna wait a bit: " + new Date() + "\n");        

         try {

             Thread.sleep();

         } catch (Exception ex) {}

         return sessionFactory.getCurrentSession().createQuery("from Vet vet order by vet.lastName, vet.firstName").list();

          }

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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