超简单使用MemCached

一时失言乱红尘 2022-04-10 05:20 215阅读 0赞

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Mem[Cache][]d的调用，使[MemCache][]d的客户端[开发][Link 1]变得超乎寻常的简单，只要一行代码就行：

@ReadThroughA[ssi][]gnCache(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][Link 2][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"
       
        
       
        />
       
        
       
        2 
       
        
       
        3 
       
        
       
        4 
       
        
       
        5 
       
        
       
        <
       
        bean 
       
        id
       
        ="memcachedConnectionBean"
       
        class
       
        ="net.nelz.simplesm.config.MemcachedConnectionBean"
       
        >
       
        
       
        6 
       
        
       
        7 
       
        
       
        <
       
        property 
       
        name
       
        ="consistentHashing"
       
        value
       
        ="true"
       
        
       
        />
       
        
       
        8 
       
        
       
        9 
       
        
       
        <
       
        property 
       
        name
       
        ="nodeList"
       
        value
       
        ="196.168.10.101:12000"
       
        
       
        />
       
        
       
        10 
       
        
       
        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"
       
        
       
        />
       
        
       
        4 
       
        
       
        5 
       
        
       
        </
       
        bean
       
        >
       
        
       
        6 
       
        
       
        7 
       
        
       
        8 
       
        
       
        9 
       
        
       
        <
       
        bean 
       
        id
       
        ="memcachedClient"
       
        factory-bean
       
        ="memcachedClientFactory"
       
        factory-method
       
        ="createMemcachedClient"
       
        
       
        />
       
        
       
        10 
       
        
       
        11 
       
        
       
        12 
       
        
       
        13 
       
        
       
        <
       
        bean 
       
        id
       
        ="methodStore"
       
        class
       
        ="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl"
       
        
       
        />
       
        
       
        14 
       
        
       
        15 
       
        
       
        16 
       
        
       
        17 
       
        
       
        <
       
        bean 
       
        id
       
        ="net.nelz.simplesm.DefaultKeyProvider"
       
        class
       
        ="net.nelz.simplesm.impl.DefaultKeyProvider"
       
        >
       
        
       
        18 
       
        
       
        19 
       
        
       
        <
       
        property 
       
        name
       
        ="methodStore"
       
        ref
       
        ="methodStore"
       
        
       
        />
       
        
       
        20 
       
        
       
        21 
       
        
       
        </
       
        bean
       
        >
       
        
       
        22 
       
        
       
        23 
       
        
       
        24 
       
        
       
        25 
       
        
       
        <
       
        bean 
       
        id
       
        ="readThroughSingleCache"
       
        class
       
        ="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice"
       
        >
       
        
       
        26 
       
        
       
        27 
       
        
       
        <
       
        property 
       
        name
       
        ="cache"
       
        ref
       
        ="memcachedClient"
       
        
       
        />
       
        
       
        28 
       
        
       
        29 
       
        
       
        <
       
        property 
       
        name
       
        ="methodStore"
       
        ref
       
        ="methodStore"
       
        
       
        />
       
        
       
        30 
       
        
       
        31 
       
        
       
        <
       
        property 
       
        name
       
        ="defaultKeyProvider"
       
        ref
       
        ="net.nelz.simplesm.DefaultKeyProvider"
       
        
       
        />
       
        
       
        32 
       
        
       
        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"
       
        >
       
        
       
        46 
       
        
       
        47 
       
        
       
        <
       
        property 
       
        name
       
        ="cache"
       
        ref
       
        ="memcachedClient"
       
        
       
        />
       
        
       
        48 
       
        
       
        49 
       
        
       
        <
       
        property 
       
        name
       
        ="methodStore"
       
        ref
       
        ="methodStore"
       
        
       
        />
       
        
       
        50 
       
        
       
        51 
       
        
       
        <
       
        property 
       
        name
       
        ="defaultKeyProvider"
       
        ref
       
        ="net.nelz.simplesm.DefaultKeyProvider"
       
        
       
        />
       
        
       
        52 
       
        
       
        53 
       
        
       
        </
       
        bean
       
        >
       
        
       
        54 
       
        
       
        55 
       
        
       
        <
       
        bean 
       
        id
       
        ="updateSingleCache"
       
        class
       
        ="net.nelz.simplesm.aop.UpdateSingleCacheAdvice"
       
        >
       
        
       
        56 
       
        
       
        57 
       
        
       
        <
       
        property 
       
        name
       
        ="cache"
       
        ref
       
        ="memcachedClient"
       
        
       
        />
       
        
       
        58 
       
        
       
        59 
       
        
       
        <
       
        property 
       
        name
       
        ="methodStore"
       
        ref
       
        ="methodStore"
       
        
       
        />
       
        
       
        60 
       
        
       
        61 
       
        
       
        <
       
        property 
       
        name
       
        ="defaultKeyProvider"
       
        ref
       
        ="net.nelz.simplesm.DefaultKeyProvider"
       
        
       
        />
       
        
       
        62 
       
        
       
        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"
       
        
       
        />
       
        
       
        72 
       
        
       
        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"
       
        
       
        />
       
        
       
        82 
       
        
       
        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"
       
        >
       
        
       
        96 
       
        
       
        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
       
        >
       
        
       
        114 
       
        
       
        115

Simple-Spring-Memcached还提供了一个例子，在spring的petStore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 
       
        } 
       
        20 
       
        
       
        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：）

[MemCached]: http://www.jzxue.com/tag/memcached/
[Cache]: http://www.jzxue.com/tag/cache/
[MemCache]: http://www.jzxue.com/tag/memcache/
[Link 1]: http://www.jzxue.com/wangzhankaifa/
[ssi]: http://www.jzxue.com/tag/SSI/
[Link 2]: http://www.jzxue.com/fuwuqi/
[IP]: http://www.jzxue.com/tag/IP/
[xml]: http://www.jzxue.com/wangzhankaifa/xml-xslt/