一个定时更新cache框架

应项目需要做了一个定时更新的 cache 框架，采用 spring+quartz 很方便的实现，可以适用任何需要定时才更新的地方，比如静态网页 cache 等。代码很简单：

---------------------------------QuartzCacheHandler-------------------------------------

<o:p> </o:p>

package  com.bankcomm.cache;

 

import  org.apache.commons.logging.Log;

import  org.apache.commons.logging.LogFactory;

import  org.springframework.context.ApplicationContext;

import  org.springframework.context.support.ClassPathXmlApplicationContext;

 

import  com.bankcomm.util.ContextUtil;

 

public   class  QuartzCacheHandler  {

        private   static  ApplicationContext actx;

 

       Log log  =  LogFactory.getLog( this .getClass());

 

        /** */ /**

        * 程序载入配置文件<br>

        * Author:pesome<br>

        * Time:2006-12-8 上午10:29:26<br>

         */

        public   static   void  init()  {

               try   {

                     actx  =   new  ClassPathXmlApplicationContext(

                                    new  String[]  {  " quartzCache*.xml "  } );

              }   catch  (Exception e)  {

                     e.printStackTrace();

                      throw   new  RuntimeException();

              }

       }

 

        private  QuartzCacheHandler()  {

       }

 

        /** */ /**

        * 在程序载入配置文件时使用<br>

        * Author:pesome<br>

        * Time:2006-12-8 上午10:28:07<br>

        * 

        *  @param  beanName

        *  @param  key

        *  @return

         */

        public   static  Object getSe(String beanName, String key)  {

               return  ((QuartzCache) actx.getBean(beanName)).get(key);

       }

 

        /** */ /**

        * 在web容器中,初始化时载入配置文件时使用<br>

* Author:pesome<br>

        * Time:2006-12-8 上午10:28:40<br>

        * 

        *  @param  beanName

        *  @param  key

        *  @return

         */

        public   static  Object get(String beanName, String key)  {

               return  ((QuartzCache) ContextUtil.getBean(beanName)).get(key);

       }

}

 

-----------------------------------QuartzCache-----------------------------------------------

package  com.bankcomm.cache;

 

import  java.util.HashMap;

import  java.util.Map;

 

import  org.apache.commons.logging.Log;

import  org.apache.commons.logging.LogFactory;

 

public   abstract   class  QuartzCache  {

        private  Log log  =  LogFactory.getLog( this .getClass());

 

        protected  Map cacheMap  =   new  HashMap();

 

        /** */ /**

        * 抽象方法由具体的cache类实现,一般为调用put方法<br>

        * Author:pesome<br>

        * Time:2006-12-7 下午05:47:26<br>

         */

        public   abstract   void  refresh();

 

        public  Object get(String key)  {

               return  cacheMap.get(key);

       }

 

        public   void  put(String key, Object value)  {

              cacheMap.put(key, value);

              log.info( " put to quartz cache key= "   +  key  +   " ,value= "   +  value);

       }

}

---------------------------------------------------------------------------------------------------------

Web.xml 中只需加 2 句：

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<o:p>

 

< context-param >
         < param-name > contextConfigLocation </ param-name >
         < param-value > /WEB-INF/applicationContext*.xml </ param-value >
     </ context-param >

     < listener >
         < listener-class >
            com.bankcomm.util.MyContextLoaderListener
         </ listener-class >
     </ listener >

 

</o:p>

最后是applicationContext_quartzCache.xml配置文件，就是标准的spring结合quartz的配置文件：<o:p></o:p>

<o:p> </o:p>

<o:p>

<? xml version="1.0" encoding="GB2312" ?>

<! DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"

                       "http://www.springframework.org/dtd/spring-beans.dtd" >

< beans >

      < bean

          class ="org.springframework.scheduling.quartz.SchedulerFactoryBean" >

          < property  name ="triggers" >

               < list >

                    < ref  local ="simpleTrigger"   />

               </ list >

          </ property >

      </ bean >

 

      < bean  id ="methodInvokingJobDetail"

         class ="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean" >

          < property  name ="targetObject" >

               < ref  bean ="simpleCache"   />

          </ property >

          < property  name ="targetMethod" >

               < value > refresh </ value >

          </ property >

      </ bean >

 

      < bean  id ="simpleTrigger"

         class ="org.springframework.scheduling.quartz.SimpleTriggerBean" >

          < property  name ="jobDetail" >

               <!--  see the example of method invoking job above  -->

               < ref  bean ="methodInvokingJobDetail"   />

          </ property >

          < property  name ="startDelay" >

               < value > 0 </ value >

          </ property >

          <!--  set the refresh interval,millisecond  -->

          < property  name ="repeatInterval" >

               < value > 2000 </ value >

          </ property >

      </ bean >

     

      <!--  custom job beans  -->

     < bean  id ="simpleCache"  class ="com.bankcomm.cache.SimpleCache" ></ bean >

</ beans >

 

</o:p>

写自己的QuartzCache子类并实现<