Java环境下Memcached实际运用详解

windows下的Server端很简单，不用安装，双击运行后默认服务端口是11211，没有试着去更改端口，因为反正以后会用unix版本，到时再记录安装步骤。下载客户端的javaAPI包，接口非常简单，参考API手册上就有现成的例子。ITPUB个人空间T {]:eJ
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目标，对旧框架缓存部分进行改造：ITPUB个人空间5W%M8YRw:z:~
1、缓存工具类
:Ob F6IG)K2I02、hibernate的provider
t*G,iKxRK03、用缓存实现session机制
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u v0W1}}5x0今天先研究研究缓存工具类的改造，在旧框架中部分函数用了ehcache对执行结果进行了缓存处理，现在目标是提供一个缓存工具类，在配置文件中配置使用哪种缓存（memcached或ehcached），使其它程序对具体的缓存不依赖，同时使用AOP方式来对方法执行结果进行缓存。
E!U~CQ%H8N?&T.Y0首先是工具类的实现：ITPUB个人空间bp%@3Ef iZ#Z
在Spring中配置
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Java代码
<!-- EhCache Manager -->  
<bean id="cacheManager" 
    class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">  
    <property name="configLocation">  
        <value>classpath:ehcache.xml</value>  
    </property>  
</bean>  
 
<bean id="localCache" 
    class="org.springframework.cache.ehcache.EhCacheFactoryBean">  
    <property name="cacheManager" ref="cacheManager" />  
    <property name="cacheName" 
        value="×××.cache.LOCAL_CACHE" />  
</bean>  
 
<bean id="cacheService" 
    class="×××.core.cache.CacheService" init-method="init" destroy-method="destory">  
    <property name="cacheServerList" value="${cache.servers}"/>  
    <property name="cacheServerWeights" value="${cache.cacheServerWeights}"/>  
    <property name="cacheCluster" value="${cache.cluster}"/>  
    <property name="localCache" ref="localCache"/>  
</bean> 
<!-- EhCache Manager -->
<bean id="cacheManager"
class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation">
<value>classpath:ehcache.xml</value>
</property>
</bean>

<bean id="localCache"
class="org.springframework.cache.ehcache.EhCacheFactoryBean">
<property name="cacheManager" ref="cacheManager" />
<property name="cacheName"
value="×××.cache.LOCAL_CACHE" />
</bean>

<bean id="cacheService"
class="×××.core.cache.CacheService" init-method="init" destroy-method="destory">
<property name="cacheServerList" value="${cache.servers}"/>
<property name="cacheServerWeights" value="${cache.cacheServerWeights}"/>
<property name="cacheCluster" value="${cache.cluster}"/>
<property name="localCache" ref="localCache"/>
</bean>在properties文件中配置${cache.servers} ${cache.cacheServerWeights} ${cache.cluster}
YYPGx'r!cH$SQ0具体工具类的代码ITPUB个人空间 _ A+n/g b~"y(E

Java代码
/**
* @author Marc
* 
*/ 
public class CacheService {  
    private Log logger = LogFactory.getLog(getClass());  
 
    private Cache localCache;  
 
    String cacheServerList;  
 
    String cacheServerWeights;  
 
    boolean cacheCluster = false;  
 
    int initialConnections = 10;  
 
    int minSpareConnections = 5;  
 
    int maxSpareConnections = 50;  
 
    long maxIdleTime = 1000 * 60 * 30; // 30 minutes 
 
    long maxBusyTime = 1000 * 60 * 5; // 5 minutes 
 
    long maintThreadSleep = 1000 * 5; // 5 seconds 
 
    int socketTimeOut = 1000 * 3; // 3 seconds to block on reads 
 
    int socketConnectTO = 1000 * 3; // 3 seconds to block on initial 
                                    // connections. If 0, then will use blocking 
                                    // connect (default) 
 
    boolean failover = false; // turn off auto-failover in event of server 
                                // down 
 
    boolean nagleAlg = false; // turn off Nagle's algorithm on all sockets in 
                                // pool 
 
    MemCachedClient mc;  
 
    public CacheService(){  
        mc = new MemCachedClient();  
        mc.setCompressEnable(false);  
    }  
    /**
     * 放入
     * 
     */ 
    public void put(String key, Object obj) {  
        Assert.hasText(key);  
        Assert.notNull(obj);  
        Assert.notNull(localCache);  
        if (this.cacheCluster) {  
            mc.set(key, obj);  
        } else {  
            Element element = new Element(key, (Serializable) obj);  
            localCache.put(element);  
        }  
    }  
    /**
     * 删除 
     */ 
    public void remove(String key){  
        Assert.hasText(key);  
        Assert.notNull(localCache);  
        if (this.cacheCluster) {  
            mc.delete(key);  
        }else{  
            localCache.remove(key);  
        }  
    }  
    /**
     * 得到
     */ 
    public Object get(String key) {  
        Assert.hasText(key);  
        Assert.notNull(localCache);  
        Object rt = null;  
        if (this.cacheCluster) {  
            rt = mc.get(key);  
        } else {  
            Element element = null;  
            try {  
                element = localCache.get(key);  
            } catch (CacheException cacheException) {  
                throw new DataRetrievalFailureException("Cache failure: " 
                        + cacheException.getMessage());  
            }  
            if(element != null)  
                rt = element.getValue();  
        }  
        return rt;  
    }  
    /**
     * 判断是否存在
     * 
     */ 
    public boolean exist(String key){  
        Assert.hasText(key);  
        Assert.notNull(localCache);  
        if (this.cacheCluster) {  
            return mc.keyExists(key);  
        }else{  
            return this.localCache.isKeyInCache(key);  
        }  
    }  
    private void init() {  
        if (this.cacheCluster) {  
            String[] serverlist = cacheServerList.split(",");  
            Integer[] weights = this.split(cacheServerWeights);  
            // initialize the pool for memcache servers 
            SockIOPool pool = SockIOPool.getInstance();  
            pool.setServers(serverlist);  
            pool.setWeights(weights);  
            pool.setInitConn(initialConnections);  
            pool.setMinConn(minSpareConnections);  
            pool.setMaxConn(maxSpareConnections);  
            pool.setMaxIdle(maxIdleTime);  
            pool.setMaxBusyTime(maxBusyTime);  
            pool.setMaintSleep(maintThreadSleep);  
            pool.setSocketTO(socketTimeOut);  
            pool.setSocketConnectTO(socketConnectTO);  
            pool.setNagle(nagleAlg);  
            pool.setHashingAlg(SockIOPool.NEW_COMPAT_HASH);  
            pool.initialize();  
            logger.info("初始化memcached pool!");  
        }  
    }  
 
    private void destory() {  
        if (this.cacheCluster) {  
            SockIOPool.getInstance().shutDown();  
        }  
    }  
} 
/**
* @author Marc
*
*/
public class CacheService {
private Log logger = LogFactory.getLog(getClass());

private Cache localCache;

String cacheServerList;

String cacheServerWeights;

boolean cacheCluster = false;

int initialConnections = 10;

int minSpareConnections = 5;

int maxSpareConnections = 50;

long maxIdleTime = 1000 * 60 * 30; // 30 minutes

long maxBusyTime = 1000 * 60 * 5; // 5 minutes

long maintThreadSleep = 1000 * 5; // 5 seconds

int socketTimeOut = 1000 * 3; // 3 seconds to block on reads

int socketConnectTO = 1000 * 3; // 3 seconds to block on initial
// connections. If 0, then will use blocking
// connect (default)

boolean failover = false; // turn off auto-failover in event of server
// down

boolean nagleAlg = false; // turn off Nagle's algorithm on all sockets in
// pool

MemCachedClient mc;

public CacheService(){
mc = new MemCachedClient();
mc.setCompressEnable(false);
}
/**
* 放入
*
*/
public void put(String key, Object obj) {
Assert.hasText(key);
Assert.notNull(obj);
Assert.notNull(localCache);
if (this.cacheCluster) {
mc.set(key, obj);
} else {
Element element = new Element(key, (Serializable) obj);
localCache.put(element);
}
}
/**
* 删除
*/
public void remove(String key){
Assert.hasText(key);
Assert.notNull(localCache);
if (this.cacheCluster) {
mc.delete(key);
}else{
localCache.remove(key);
}
}
/**
* 得到
*/
public Object get(String key) {
Assert.hasText(key);
Assert.notNull(localCache);
Object rt = null;
if (this.cacheCluster) {
rt = mc.get(key);
} else {
Element element = null;
try {
            element = localCache.get(key);
        } catch (CacheException cacheException) {
            throw new DataRetrievalFailureException("Cache failure: "
                    + cacheException.getMessage());
        }
if(element != null)
rt = element.getValue();
}
return rt;
}
/**
* 判断是否存在
*
*/
public boolean exist(String key){
Assert.hasText(key);
Assert.notNull(localCache);
if (this.cacheCluster) {
return mc.keyExists(key);
}else{
return this.localCache.isKeyInCache(key);
}
}
private void init() {
if (this.cacheCluster) {
String[] serverlist = cacheServerList.split(",");
Integer[] weights = this.split(cacheServerWeights);
// initialize the pool for memcache servers
SockIOPool pool = SockIOPool.getInstance();
pool.setServers(serverlist);
pool.setWeights(weights);
pool.setInitConn(initialConnections);
pool.setMinConn(minSpareConnections);
pool.setMaxConn(maxSpareConnections);
pool.setMaxIdle(maxIdleTime);
pool.setMaxBusyTime(maxBusyTime);
pool.setMaintSleep(maintThreadSleep);
pool.setSocketTO(socketTimeOut);
pool.setSocketConnectTO(socketConnectTO);
pool.setNagle(nagleAlg);
pool.setHashingAlg(SockIOPool.NEW_COMPAT_HASH);
pool.initialize();
logger.info("初始化memcachedpool!");
}
}

private void destory() {
if (this.cacheCluster) {
SockIOPool.getInstance().shutDown();
}
}
}ITPUB个人空间~+v]^8Q
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然后实现函数的AOP拦截类，用来在函数执行前返回缓存内容ITPUB个人空间L9a m{em0w

Java代码
public class CachingInterceptor implements MethodInterceptor {  
 
    private CacheService cacheService;  
    private String cacheKey;  
 
    public void setCacheKey(String cacheKey) {  
        this.cacheKey = cacheKey;  
    }  
 
    public void setCacheService(CacheService cacheService) {  
        this.cacheService = cacheService;  
    }  
 
    public Object invoke(MethodInvocation invocation) throws Throwable {  
        Object result = cacheService.get(cacheKey);  
        //如果函数返回结果不在Cache中,执行函数并将结果放入Cache 
        if (result == null) {  
            result = invocation.proceed();  
            cacheService.put(cacheKey,result);  
        }  
        return result;  
    }  
} 
public class CachingInterceptor implements MethodInterceptor {

    private CacheService cacheService;
    private String cacheKey;

    public void setCacheKey(String cacheKey) {
        this.cacheKey = cacheKey;
    }

    public void setCacheService(CacheService cacheService) {
        this.cacheService = cacheService;
    }

    public Object invoke(MethodInvocation invocation) throws Throwable {
        Object result = cacheService.get(cacheKey);
        //如果函数返回结果不在Cache中,执行函数并将结果放入Cache
        if (result == null) {
            result = invocation.proceed();
            cacheService.put(cacheKey,result);
        }
        return result;
    }
}Spring的AOP配置如下：
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Java代码
<aop:config proxy-target-class="true">  
        <aop:advisor  
            pointcut="execution(* ×××.PoiService.getOne(..))" 
            advice-ref="PoiServiceCachingAdvice" />  
    </aop:config>  
 
    <bean id="BasPoiServiceCachingAdvice" 
        class="×××.core.cache.CachingInterceptor">  
        <property name="cacheKey" value="PoiService" />  
        <property name="cacheService" ref="cacheService" />  
    </bean> 

评论

2 楼 mbnxyz 2012-07-21  

9494 乱码啊

1 楼 weitongyixun 2011-09-20  

乱码啊 。。。。。。。