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

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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("\n ! ! !Gonna wait a bit: " + new Date() + "\n");        
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