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：
1 <import resource="classpath:simplesm-context.xml" />
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3
4
5 <bean id="memcachedConnectionBean" class="net.nelz.simplesm.config.MemcachedConnectionBean">
6
7 <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：
1 <bean id="memcachedClientFactory" class="net.nelz.simplesm.config.MemcachedClientFactory" >
2
3 <property name="bean" ref="memcachedConnectionBean" />
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5 </bean>
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7
8
9 <bean id="memcachedClient" factory-bean="memcachedClientFactory" factory-method="createMemcachedClient" />
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11
12
13 <bean id="methodStore" class="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl" />
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15
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17 <bean id="net.nelz.simplesm.DefaultKeyProvider" class="net.nelz.simplesm.impl.DefaultKeyProvider">
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19 <property name="methodStore" ref="methodStore" />
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21 </bean>
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23
24
25 <bean id="readThroughSingleCache" class="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice">
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27 <property name="cache" ref="memcachedClient" />
28
29 <property name="methodStore" ref="methodStore" />
30
31 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
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33 </bean>
34
35 <bean id="readThroughMultiCache" class="net.nelz.simplesm.aop.ReadThroughMultiCacheAdvice">
36
37 <property name="cache" ref="memcachedClient" />
38
39 <property name="methodStore" ref="methodStore" />
40
41 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
42
43 </bean>
44
45 <bean id="readThroughAssignCache" class="net.nelz.simplesm.aop.ReadThroughAssignCacheAdvice">
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47 <property name="cache" ref="memcachedClient" />
48
49 <property name="methodStore" ref="methodStore" />
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51 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
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53 </bean>
54
55 <bean id="updateSingleCache" class="net.nelz.simplesm.aop.UpdateSingleCacheAdvice">
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57 <property name="cache" ref="memcachedClient" />
58
59 <property name="methodStore" ref="methodStore" />
60
61 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
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63 </bean>
64
65 <bean id="updateMultiCache" class="net.nelz.simplesm.aop.UpdateMultiCacheAdvice">
66
67 <property name="cache" ref="memcachedClient" />
68
69 <property name="methodStore" ref="methodStore" />
70
71 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
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73 </bean>
74
75 <bean id="updateAssignCache" class="net.nelz.simplesm.aop.UpdateAssignCacheAdvice">
76
77 <property name="cache" ref="memcachedClient" />
78
79 <property name="methodStore" ref="methodStore" />
80
81 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
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83 </bean>
84
85 <bean id="invalidateSingleCache" class="net.nelz.simplesm.aop.InvalidateSingleCacheAdvice">
86
87 <property name="cache" ref="memcachedClient" />
88
89 <property name="methodStore" ref="methodStore" />
90
91 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
92
93 </bean>
94
95 <bean id="invalidateMultiCache" class="net.nelz.simplesm.aop.InvalidateMultiCacheAdvice">
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97 <property name="cache" ref="memcachedClient" />
98
99 <property name="methodStore" ref="methodStore" />
100
101 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
102
103 </bean>
104
105 <bean id="invalidateAssignCache" class="net.nelz.simplesm.aop.InvalidateAssignCacheAdvice">
106
107 <property name="cache" ref="memcachedClient" />
108
109 <property name="methodStore" ref="methodStore" />
110
111 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />
112
113 </bean>
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115
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;
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3 import net.nelz.simplesm.annotations.ReadThroughSingleCache;
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5 @ReadThroughAssignCache(assignedKey = "VETS", expiration = 300, namespace = "NELZ")
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7 public Collection<Vet> getVets() {
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9 System.out.println("\n ! ! !Gonna wait a bit: " + new Date() + "\n");
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11 try {
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13 Thread.sleep(4000);
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15 } catch (Exception ex) {}
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17 return sessionFactory.getCurrentSession().createQuery("from Vet vet order by vet.lastName, vet.firstName").list();
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19 }
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21
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：）
