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ehcache教程

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  • web
 
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Spring 3.0.5的,更细颗粒化的缓存设置,更方便的注解,可以具体到把每个方式的返回值做缓存,

需要 ehcache-spring-annotations-1.1.x,附件已提供

首先,applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:ehcache="http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring"
xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-3.0.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
  http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring  
  http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring/ehcache-spring-1.1.xsd">

<ehcache:annotation-driven cache-manager="ehCacheManager" />

<bean id="ehCacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"> 
       <property name="configLocation" value="classpath:ehcache.xml" /> 
   </bean>


其次,src下的ehcache.xml
<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
updateCheck="false">
<diskStore path="java.io.tmpdir" />
<defaultCache eternal="false"
   maxElementsInMemory="1000"
   overflowToDisk="false"
   diskPersistent="false"
   timeToIdleSeconds="0"
   timeToLiveSeconds="600"
   memoryStoreEvictionPolicy="LRU" />

<cache name="departCache"
   eternal="false"
   maxElementsInMemory="100"
   overflowToDisk="false"
   diskPersistent="false"
   timeToIdleSeconds="0"
   timeToLiveSeconds="300"
   memoryStoreEvictionPolicy="LRU" />

</ehcache>


DAO层缓存:例如下边这个方法的返回值需要缓存:

@SuppressWarnings("unchecked")
//spring 3 基于注解ehcache缓存配置;
@Cacheable(cacheName="departCache")
public List<AppDepart> getChildDepart(Integer id) throws Exception {
  return  this.getHibernateTemplate().find("from AppDepart  where state=1 and idParent="+id);
}

@Cacheable(cacheName="departCache") 加上这句话,其中cacheName 对应ehcache.xml  中的<cache name="departCache"

这样这个方法返回值就可以被缓存起来的了,但是怎么样把缓存数据和数据库中的数据实现同步呢?

如果对这个PO做update ,save,delete 可以实现这样策略如下:

@Transactional(propagation = Propagation.REQUIRED)
//设定spring的ecache缓存策略,当编辑机构时候,把缓存全部清除掉,以达到缓存那数据同步;
@TriggersRemove(cacheName="departCache",removeAll=true)
public boolean editDepart(String depno, String depName) {
  boolean flag = false;
  try {
   AppDepart depart = departDao.getAppdepart(depno);
   depart.setDepName(depName);
   departDao.update(depart);
   flag = true;
  } catch (Exception e) {
   e.printStackTrace();
  }
  return flag;
}
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评论
1 楼 798881262 2015-04-02  
就这点也敢叫教程

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