閱讀本文的前提是，你已經(jīng)安裝或者使用了MemCached，或具有相關(guān)的基本知識(shí)。

　　今天要介紹的是Simple-Spring-Memcached，它封裝了對MemCached的調(diào)用，使MemCached的客戶端開發(fā)變得超乎尋常的簡單，只要一行代碼就行：

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

　　是不是很神奇？這行代碼指定了MemCached的key，過期時(shí)間和命名空間。假設(shè)你的MemCached服務(wù)器IP是：196.168.10.101，端口是：12000，那么在數(shù)據(jù)調(diào)用的配置文件中只要加上下面配置代碼就可以了：

<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>

從simplesm-context.xml的內(nèi)容中，可以看出它所封裝的類和方法：

<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還提供了一個(gè)例子，在spring的petClinic例子中加入了幾行代碼，就實(shí)現(xiàn)了對MemCached的調(diào)用：

import net.nelz.simplesm.annotations.ReadThroughAssignCache;

import net.nelz.simplesm.annotations.ReadThroughSingleCache;

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

public Collection<Vet> getVets() {

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

Thread.sleep(4000);

} catch (Exception ex) {}

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

}