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      先描述下我的环境eclipse 3.2.2+myeclilpse 5.5.1
Spring 2.0.6,Ehcache用spring2.0.6带的1.2.4
加入的jar
Spring.jar
commons-logging.jar
ehcache-1.2.4.jar
log4j-1.2.14.jar
junit3.8.1.jar

      示例描述:通过省ID找它下面的市,缓存市.

1.我用IdAndName类封装市,可以替换成String.
package com.chenlb.study.ehcache;

/**
 * 2007-8-2
 * 
@author chenlb
 * 
 
*/
public class IdAndName {

    
private Integer id;
    
private String name;
    
    
public IdAndName() {}
    
    
    
/**
     * 
@param id
     * 
@param name
     
*/
    
public IdAndName(Integer id, String name) {
        
super();
        
this.id = id;
        
this.name = name;
    }
    
    
public Integer getId() {
        
return id;
    }
    
public void setId(Integer id) {
        
this.id = id;
    }
    
public String getName() {
        
return name;
    }
    
public void setName(String name) {
        
this.name = name;
    }    
}

2.定义一个接口CityCache
package com.chenlb.study.ehcache;

import java.util.List;

/**
 * 2007-8-2
 * 
@author chenlb
 * 
 
*/
public interface CityCache {
    
public List<IdAndName> getCitys(Integer provinceId);
}

3.定义数据类CityData,
/*
 * 
 
*/
package com.chenlb.study.ehcache;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 2007-8-2
 * 
@author chenlb
 * 
 
*/
public class CityData {

    
static Map<Integer, List<IdAndName>> provinces = new HashMap<Integer, List<IdAndName>>();
    
    
static {
        ArrayList
<IdAndName> al = new ArrayList<IdAndName>();    //广东
        al.add(new IdAndName(1,"广州市"));    al.add(new IdAndName(2,"梅州市"));
        provinces.put(
1, al);
        
        al 
= new ArrayList<IdAndName>();    //上海
        al.add(new IdAndName(1,"黄浦"));    al.add(new IdAndName(2,"卢湾"));
        provinces.put(
2, al);
    }
    
    
/**
     * 此方法可以换成从数据库得到数据
     * 
@param provinceId
     * 
@return
     
*/
    
public static List<IdAndName> getCityByProvince(Integer provinceId) {
        
return provinces.get(provinceId);
    }
}

4.市缓存实现CityCacheMemoryImpl
/*
 * 
 
*/
package com.chenlb.study.ehcache;

import java.util.List;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 2007-8-2
 * 
@author chenlb
 * 
 
*/
public class CityCacheMemoryImpl implements CityCache{
    
private static final Log logger = LogFactory.getLog(CityCacheMemoryImpl.class);
    
private Cache cityCache;
    
    
/* (non-Javadoc)
     * @see com.chenlb.study.ehcache.CityCache#getCitys(java.lang.Integer)
     
*/
    
public List<IdAndName> getCitys(Integer provinceId) {
        
// TODO Auto-generated method stub
        Element element = cityCache.get(provinceId);
        
if(element == null) {
            List
<IdAndName> lt = CityData.getCityByProvince(provinceId);//可以认为是数据查询
            element 
= new Element(provinceId, lt);
            cityCache.put(element);
            
if(logger.isInfoEnabled()) {
                logger.info(
"城市加载到缓存");
            }
        }
        
return (List<IdAndName>) element.getValue();
    }


    
public void setCityCache(Cache cityCache) {
        
this.cityCache = cityCache;
    }

}
说明:getcitys()方法重要,要加载没有的内容


5.ehcache.xml同时把ehcache.xsd放到同一目录
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd">
    
<diskStore path="java.io.tmpdir"/>
    
<defaultCache
            
maxElementsInMemory="10000"
            eternal
="false"
            timeToIdleSeconds
="120"
            timeToLiveSeconds
="120"
            overflowToDisk
="true"
            maxElementsOnDisk
="10000000"
            diskPersistent
="false"
            diskExpiryThreadIntervalSeconds
="120"
            memoryStoreEvictionPolicy
="LRU"
            
/>
    
<cache name="cityCache"
           maxElementsInMemory
="10"   //最大缓存10个对象
           eternal
="false"   //不是永久有效
           overflowToDisk
="false" //缓存满了不写的磁盘
           timeToIdleSeconds
="1"   //1秒后没有读就失效
           timeToLiveSeconds
="2" //2秒后失效
           memoryStoreEvictionPolicy
="LFU"
            
/>
</ehcache>

6.Spring 配置文件夹applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation
="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    
<bean id="cacheManager"
        class
="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
        
<property name="configLocation"
            value
="classpath:com/chenlb/study/ehcache/ehcache.xml">
        
</property>
    
</bean>
    
    
<bean id="cityCacheBean" class="org.springframework.cache.ehcache.EhCacheFactoryBean">
        
<property name="cacheManager" ref="cacheManager"></property>
        
<property name="cacheName" value="cityCache"></property>
    
</bean>

    
<bean id="cityCache" class="com.chenlb.study.ehcache.CityCacheMemoryImpl">
        
<property name="cityCache" ref="cityCacheBean"></property>
    
</bean>
</beans>

7.测试用例CityCacheTest
/*
 * 
 
*/
package com.chenlb.study.ehcache;

import java.util.List;
import java.util.Random;

import junit.framework.TestCase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * 2007-8-2
 * 
@author chenlb
 * 
 
*/
public class CityCacheTest extends TestCase {

    
protected final Log logger = LogFactory.getLog(getClass());

    
private ApplicationContext context;
    
private Random random;
    
/**
     * 
@throws java.lang.Exception
     
*/
    
protected void setUp() throws Exception {
        context 
= new ClassPathXmlApplicationContext(
                
new String[] {"application*.xml"}
            );
        random 
= new Random();
    }

    
/**
     * 
@throws java.lang.Exception
     
*/
    
protected void tearDown() throws Exception {
    }

    
/**
     * Test method for {
@link com.chenlb.study.ehcache.CityCache#getCitys(java.lang.Integer)}.
     
*/
    
public void testGetCitys() {
        CityCache cityCache 
= (CityCache) context.getBean("cityCache");
        
        List
<IdAndName> citys = cityCache.getCitys(1);
        
        assertNotNull(citys);
        assertTrue(citys.size() 
> 0);
        
for(IdAndName inn : citys) {
            logger.info(
"省1 : "+inn.getName());
        }
        
        citys 
= cityCache.getCitys(2);
        assertNotNull(citys);
        assertTrue(citys.size() 
> 0);
        
for(IdAndName inn : citys) {
            logger.info(
"省2 : "+inn.getName());
        }
    }

    
public void testGetCitysWithLoop() {
        CityCache cityCache 
= (CityCache) context.getBean("cityCache");
        
        List
<IdAndName> citys, citys_2;
        
int loopNum = 5;
        
int totelTimes = 0;
        
do {
            logger.info(
"===============第 "+(6-loopNum)+"次循环===============");
            citys 
= cityCache.getCitys(1);
            assertNotNull(citys);
            assertTrue(citys.size() 
> 0);
            
for(IdAndName inn : citys) {
                logger.info(
"省1 : "+inn.getName());
            }
            citys_2 
= cityCache.getCitys(2);
            assertNotNull(citys_2);
            assertTrue(citys_2.size() 
> 0);
            
for(IdAndName inn : citys_2) {
                logger.info(
"省2 : "+inn.getName());
            }
            loopNum    
--;
            
try {
                
int times = random.nextInt(800+ 400;//400 - 1200 ms
                Thread.sleep(times);
                totelTimes 
+= times;
                logger.info(totelTimes 
+ " ms 后, 间隔: "+times+" ms");
            } 
catch (InterruptedException e) {
                
// TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
while(loopNum > 0);
        
        loopNum 
= 5;
        
do {    //省2
            logger.info("===============第 "+(6-loopNum)+"次循环===============");
            citys 
= cityCache.getCitys(2);
            assertNotNull(citys);
            assertTrue(citys.size() 
> 0);
            
for(IdAndName inn : citys) {
                logger.info(
"省2 : "+inn.getName());
            }
            loopNum    
--;
            
try {
                
int times = random.nextInt(400+ 400;//400 - 800 ms
                Thread.sleep(times);
                totelTimes 
+= times;
                logger.info(totelTimes
+" ms 后, 间隔: "+times+" ms");
            } 
catch (InterruptedException e) {
                
// TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
while(loopNum > 0);
        
    }
}


有什么不足的地方请高人指点
posted on 2007-08-02 14:35 流浪汗 阅读(2956) 评论(1)  编辑  收藏 所属分类: OpenSource

评论:
# re: Spring ehcache 之"城市"缓存 2008-02-20 17:43 | kuan
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