XMemcached与Spring3.2缓存框架集成

从Spring3.1开始，增加了抽像缓存框架，利用Spring3.1提供的注释，可以很方便的使用缓存，Spring官方给出基于Map和 EHCache的实现，正好最近在用Memcached，参考了EHCacheCacheManager的源码，写了一个基于XMemcached的 MemcachedCacheManager。

 

直接上代码(注：只支持Spring3.2以上版本)

 

 

 

1、MemcachedCacheManager.java

 

public class MemcachedCacheManager extends AbstractTransactionSupportingCacheManager
{
    private ConcurrentMap<String, Cache> cacheMap = new ConcurrentHashMap<String, Cache>();
    private Map<String, Integer> expireMap = new HashMap<String, Integer>();

    private MemcachedClient memcachedClient;

    public MemcachedCacheManager()
    {
    }

    @Override
    protected Collection<? extends Cache> loadCaches()
    {
        Collection<Cache> values = cacheMap.values();
        return values;
    }

    @Override
    public Cache getCache(String name)
    {
        Cache cache = cacheMap.get(name);
        if (cache == null)
        {
            Integer expire = expireMap.get(name);
            if (expire == null)
            {
                expire = 0;
                expireMap.put(name, expire);
            }

            cache = new MemcachedCache(name, expire.intValue(), memcachedClient);
            cacheMap.put(name, cache);
        }
        return cache;
    }

    public void setMemcachedClient(MemcachedClient memcachedClient)
    {
        this.memcachedClient = memcachedClient;
    }

    public void setConfigMap(Map<String, Integer> configMap)
    {
        this.expireMap = configMap;
    }

}

 

 2、MemcachedCache.java

 

 

 

public class MemcachedCache implements Cache
{
    private final String name;
    private final MemcachedClient memcachedClient;
    private final MemCache memCache;

    public MemcachedCache(String name, int expire, MemcachedClient memcachedClient)
    {
        this.name = name;
        this.memcachedClient = memcachedClient;
        this.memCache = new MemCache(name, expire, memcachedClient);
    }

    @Override
    public void clear()
    {
        memCache.clear();
    }

    @Override
    public void evict(Object key)
    {
        memCache.delete(key.toString());
    }

    @Override
    public ValueWrapper get(Object key)
    {
        ValueWrapper wrapper = null;
        Object value = memCache.get(key.toString());
        if (value != null)
        {
            wrapper = new SimpleValueWrapper(value);
        }
        return wrapper;
    }

    @Override
    public String getName()
    {
        return this.name;
    }

    @Override
    public MemcachedClient getNativeCache()
    {
        return this.memcachedClient;
    }

    @Override
    public void put(Object key, Object value)
    {
        memCache.put(key.toString(), value);
    }
}

 

 3、MemCache.java

 

public class MemCache
{
    private static Logger log = LoggerFactory.getLogger(MemCache.class);

    private Set<String> keySet = new HashSet<String>();
    private final String name;
    private final int expire;
    private final MemcachedClient memcachedClient;

    public MemCache(String name, int expire, MemcachedClient memcachedClient)
    {
        this.name = name;
        this.expire = expire;
        this.memcachedClient = memcachedClient;
    }

    public Object get(String key)
    {
        Object value = null;
        try
        {
            key = this.getKey(key);
            value = memcachedClient.get(key);
        }
        catch (TimeoutException e)
        {
            log.warn("获取 Memcached 缓存超时", e);
        }
        catch (InterruptedException e)
        {
            log.warn("获取 Memcached 缓存被中断", e);
        }
        catch (MemcachedException e)
        {
            log.warn("获取 Memcached 缓存错误", e);
        }
        return value;
    }

    public void put(String key, Object value)
    {
        if (value == null)
            return;

        try
        {
            key = this.getKey(key);
            memcachedClient.setWithNoReply(key, expire, value);
            keySet.add(key);
        }
        catch (InterruptedException e)
        {
            log.warn("更新 Memcached 缓存被中断", e);
        }
        catch (MemcachedException e)
        {
            log.warn("更新 Memcached 缓存错误", e);
        }
    }


    public void clear()
    {
        for (String key : keySet)
        {
            try
            {
                memcachedClient.deleteWithNoReply(this.getKey(key));
            }
            catch (InterruptedException e)
            {
                log.warn("删除 Memcached 缓存被中断", e);
            }
            catch (MemcachedException e)
            {
                log.warn("删除 Memcached 缓存错误", e);
            }
        }
    }


    public void delete(String key)
    {
        try
        {
            key = this.getKey(key);
            memcachedClient.deleteWithNoReply(key);
        }
        catch (InterruptedException e)
        {
            log.warn("删除 Memcached 缓存被中断", e);
        }
        catch (MemcachedException e)
        {
            log.warn("删除 Memcached 缓存错误", e);
        }
    }


    private String getKey(String key)
    {
        return name + "_" + key;
    }
}

 

 4、配置文件 

 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:cache="http://www.springframework.org/schema/cache"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/cache
        http://www.springframework.org/schema/cache/spring-cache-3.2.xsd"
        default-autowire="byName">

    <bean id="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
        <constructor-arg>
            <list>
                <bean class="java.net.InetSocketAddress">
                    <constructor-arg value="localhost"/>
                    <constructor-arg value="11211"/>
                </bean>
            </list>
        </constructor-arg>
        <property name="connectionPoolSize" value="5"/>
        <property name="commandFactory">
            <bean class="net.rubyeye.xmemcached.command.BinaryCommandFactory"/>
        </property>
        <property name="transcoder">
            <bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
        </property>
    </bean>

    <bean id="memcachedClient" factory-bean="memcachedClientBuilder" factory-method="build" destroy-method="shutdown"/>

    <bean id="cacheManager" class="xxx.MemcachedCacheManager">
        <property name="memcachedClient" ref="memcachedClient" />
        <property name="configMap">
            <map>
                <!-- key：@Cacheable、@CachePut、@CacheEvict等的name属性。value：缓存过期时间(单位：秒)，默认值：0 -->
                <entry key="typeList" value="3600" />
            </map>
        </property>
    </bean>

    <cache:annotation-driven cache-manager="cacheManager"/>

</beans>

 至于如何使用Spring的@Cachable，google上一大堆，我就不再重复了。