Spring Cache

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Cache Spring Java Bean Apache

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

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);

    }
}

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