阅读本文的前提是，你已经安装或者使用了MemCached，或具有相关的基本知识。
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：
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<
import
resource
="classpath:simplesm-context.xml"
/>
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3
4
5
<
bean
id
="memcachedConnectionBean"
class
="net.nelz.simplesm.config.MemcachedConnectionBean"
>
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<
property
name
="consistentHashing"
value
="true"
/>
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9
<
property
name
="nodeList"
value
="196.168.10.101:12000"
/>
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11
</
bean
>
从simplesm-context.xml的内容中，可以看出它所封装的类和方法：
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<
bean
id
="memcachedClientFactory"
class
="net.nelz.simplesm.config.MemcachedClientFactory"
>
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3
<
property
name
="bean"
ref
="memcachedConnectionBean"
/>
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5
</
bean
>
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7
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9
<
bean
id
="memcachedClient"
factory-bean
="memcachedClientFactory"
factory-method
="createMemcachedClient"
/>
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<
bean
id
="methodStore"
class
="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl"
/>
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15
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<
bean
id
="net.nelz.simplesm.DefaultKeyProvider"
class
="net.nelz.simplesm.impl.DefaultKeyProvider"
>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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</
bean
>
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<
bean
id
="readThroughSingleCache"
class
="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="readThroughMultiCache"
class
="net.nelz.simplesm.aop.ReadThroughMultiCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="readThroughAssignCache"
class
="net.nelz.simplesm.aop.ReadThroughAssignCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="updateSingleCache"
class
="net.nelz.simplesm.aop.UpdateSingleCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="updateMultiCache"
class
="net.nelz.simplesm.aop.UpdateMultiCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="updateAssignCache"
class
="net.nelz.simplesm.aop.UpdateAssignCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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81
<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="invalidateSingleCache"
class
="net.nelz.simplesm.aop.InvalidateSingleCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="invalidateMultiCache"
class
="net.nelz.simplesm.aop.InvalidateMultiCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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101
<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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<
bean
id
="invalidateAssignCache"
class
="net.nelz.simplesm.aop.InvalidateAssignCacheAdvice"
>
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<
property
name
="cache"
ref
="memcachedClient"
/>
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<
property
name
="methodStore"
ref
="methodStore"
/>
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<
property
name
="defaultKeyProvider"
ref
="net.nelz.simplesm.DefaultKeyProvider"
/>
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</
bean
>
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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：
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import
net.nelz.simplesm.annotations.ReadThroughAssignCache;
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import
net.nelz.simplesm.annotations.ReadThroughSingleCache;
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5
@ReadThroughAssignCache(assignedKey
=
"
VETS
"
, expiration
=
300
, namespace
=
"
NELZ
"
)
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public
Collection
<
Vet
>
getVets() {
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9
System.out.println(
"
\n ! ! !Gonna wait a bit:
"
+
new
Date()
+
"
\n
"
);
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try
{
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Thread.sleep(
4000
);
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}
catch
(Exception ex) {}
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return
sessionFactory.getCurrentSession().createQuery(
"
from Vet vet order by vet.lastName, vet.firstName
"
).list();
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}
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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)。
夜深了，大家也应该sleep了吧：）
