spring+ehcache 兑现原理

package com.my.cache.ehcache;

import java.io.Serializable;

import net.sf.ehcache.Cache;
import net.sf.ehcache.Element;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
* ehCache 查询缓存处理
* @author lyon.yao
*
*/
public class MethodCacheInterceptor implements MethodInterceptor,
InitializingBean {
private static final Log logger = LogFactory.getLog(MethodCacheInterceptor.class);
private Cache cache;
public void setCache(Cache cache) {
this.cache = cache;
}

public MethodCacheInterceptor() {
super();
}

/* (non-Javadoc)
* 检测cache对象是否为空
* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
*/
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(cache, "cache is null,please set a new cache");
}

/* (non-Javadoc)
* 过滤service/dao 方法如果缓存中存在直接返回 否则从数据库中查找结果返回并放入缓存
* @see org.aopalliance.intercept.MethodInterceptor#invoke(org.aopalliance.intercept.MethodInvocation)
*/
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
Object result=null;
String targetName = invocation.getThis().getClass().getName();
String methodName = invocation.getMethod().getName();
Object[] arguments = invocation.getArguments();
String cacheKey = getCacheKey(targetName, methodName, arguments);
Element element = cache.get(cacheKey);
if (element == null) {
logger.debug("Hold up method , Get method result and create cache........!");
result = invocation.proceed();
element = new Element(cacheKey, (Serializable) result);
cache.put(element);
}
return element.getValue();
}
/**
* 获得 cache key 的方法，cache key 是 Cache 中一个 Element 的唯一标识
* cache key 包括　包名+类名+方法名，如 com.co.cache.service.UserServiceImpl.getAllUser
* @param targetName
* @param methodName
* @param arguments
* @return
*/
private String getCacheKey(String targetName,String methodName,Object[] arguments) {
StringBuffer key = new StringBuffer();
key.append(targetName).append(".").append(methodName);
if ((arguments != null) && (arguments.length != 0)) {
for (int i = 0; i < arguments.length; i++) {
key.append(".").append(arguments[i]);
}
}
return key.toString();
}
}

package com.my.cache.ehcache;

import java.lang.reflect.Method;
import java.util.List;

import net.sf.ehcache.Cache;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
* 功能:进行插入、修改、删除对cache的清理
* @author lyon.yao
*
*/
public class MethodCacheAfterAdvice implements AfterReturningAdvice,
InitializingBean {
private static final Log logger = LogFactory.getLog(MethodCacheAfterAdvice.class);
private Cache cache;
public void setCache(Cache cache) {
this.cache = cache;
}
public MethodCacheAfterAdvice() {
super();
}
/* (non-Javadoc)
* 检测cache对象是否为空
* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
*/
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(cache, "cache is null,please set a new cache");
}

/* (non-Javadoc)
* 刷新cache
* @see org.springframework.aop.AfterReturningAdvice#afterReturning(java.lang.Object, java.lang.reflect.Method, java.lang.Object[], java.lang.Object)
*/
@Override
public void afterReturning(Object arg0, Method arg1, Object[] arg2,
Object arg3) throws Throwable {
String className = arg3.getClass().getName();
List list = cache.getKeys();
for(int i = 0;i<list.size();i++){
String cacheKey = String.valueOf(list.get(i));
if(cacheKey.startsWith(className)){
cache.remove(cacheKey);
}
logger.debug("remove cache " + cacheKey);
}
}

}

?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!-- 缓存管理 -->
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" >
<property name="configLocation">
<value>classpath:ehcache.xml</value>
</property>
</bean>
<!-- 信息缓存 -->
<bean id="ehCache" class="org.springframework.cache.ehcache.EhCacheFactoryBean">
<property name="cacheName">
<value>DEFAULT_CACHE</value>
</property>
<property name="cacheManager" ref="cacheManager" />
</bean>
<!-- find/create cache 拦截器 -->
<bean id="methodCacheInterceptor"
class="com.my.cache.ehcache.MethodCacheInterceptor">
<property name="cache">
<ref local="ehCache" />
</property>
</bean>
<!-- flush cache 拦截器 -->
<bean id="methodCacheAfterAdvice"
class="com.my.cache.ehcache.MethodCacheAfterAdvice">
<property name="cache">
<ref local="ehCache" />
</property>
</bean>
<bean id="methodCachePointCut"
class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice">
<ref local="methodCacheInterceptor"/>
</property>
<property name="patterns">
<list>
<value>.*find.*</value>
<value>.*get.*</value>
<value>.*list.*</value>
<value>.*query.*</value>
</list>
</property>
</bean>
<bean id="methodCachePointCutAdvice"
class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice">
<ref local="methodCacheAfterAdvice"/>
</property>
<property name="patterns">
<list>
<value>.*add.*</value>
<value>.*create.*</value>
<value>.*update.*</value>
<value>.*delete.*</value>
<value>.*remove.*</value>
</list>
</property>
</bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<import resource="cacheContext.xml"/>
<bean id="testServiceTarget" class="com.co.cache.test.TestServiceImpl"/>
<bean id="testService" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target">
<ref local="testServiceTarget"/>
</property>
<property name="interceptorNames">
<list>
<value>methodCachePointCut</value>
<value>methodCachePointCutAdvice</value>
</list>
</property>
</bean>
</beans>