Spring Cache抽象-基于XML的配置声明(基于EhCache的配置)
概述
首先请阅读Spring Cache抽象-基于XML的配置声明(基于ConcurrentMap的配置),本篇博文基于XML的配置,使用了Ehcache缓存管理器。
基于Java类注解的EhCache请阅读 Spring Cache抽象-使用Java类注解的方式整合EhCache
完整示例
pom.xml增加依赖
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>${ehcache.version}</version>
</dependency>
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版本为 : <ehcache.version>2.10.4</ehcache.version>
数据库表数据(Oracle):
实体类
package com.xgj.cache.springCacheXmlEhCache.domain;
import java.io.Serializable;
/**
*
*
* @ClassName: LittleArtisan
*
* @Description: Java中的缓存和序列化是息息相关的,注意实现Serializable接口
*
* @author: Mr.Yang
*
* @date: 2017年10月2日 下午1:40:53
*/
public class LittleArtisan implements Serializable {
private static final long serialVersionUID = 1L;
private String artisanId;
private String artisanName;
private String artisanDesc;
public String getArtisanId() {
return artisanId;
}
public void setArtisanId(String artisanId) {
this.artisanId = artisanId;
}
public String getArtisanName() {
return artisanName;
}
public void setArtisanName(String artisanName) {
this.artisanName = artisanName;
}
public String getArtisanDesc() {
return artisanDesc;
}
public void setArtisanDesc(String artisanDesc) {
this.artisanDesc = artisanDesc;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
}
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服务层
package com.xgj.cache.springCacheXmlEhCache.service;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;
import com.xgj.cache.springCacheXmlEhCache.domain.LittleArtisan;
/**
*
*
* @ClassName: LittleArtisanSpringCacheService
*
* @Description:
*
* @author: Mr.Yang
*
* @date: 2017年10月4日 上午12:41:32
*/
public class LittleArtisanSpringCacheService {
private Logger logger = Logger
.getLogger(LittleArtisanSpringCacheService.class);
private static final String selectArtisanSQL = "select artisan_id ,artisan_name ,artisan_desc from little_artisan where artisan_name = ?";
private JdbcTemplate jdbcTemplate;
@Autowired
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
/**
*
*
* @Title: getArtisan
*
* @Description: getArtisan 通过在xml中配置 缓存数据
*
* @param artisanName
* @return
*
* @return: LittleArtisan
*/
public LittleArtisan getArtisan(String artisanName) {
// 方法内部实现不考虑缓存逻辑,直接实现业务
System.out.println("查找Artisan:" + artisanName);
return getFromDB(artisanName);
}
/**
*
*
* @Title: reloadArtisan
*
* @Description: 清除缓存
*
*
* @return: void
*/
public void reloadArtisan() {
System.out.println("cache cleared");
}
/**
*
*
* @Title: getFromDB
*
* @Description: 从数据库中获取LittleArtisan
*
* @param artisanName
* @return
*
* @return: LittleArtisan
*/
private LittleArtisan getFromDB(String artisanName) {
System.out.println("getFromDB");
final LittleArtisan littleArtisan = new LittleArtisan();
jdbcTemplate.query(selectArtisanSQL, new Object[] { artisanName },
new RowCallbackHandler() {
@Override
public void processRow(ResultSet rs) throws SQLException {
littleArtisan.setArtisanId(rs.getString("artisan_id"));
littleArtisan.setArtisanName(rs
.getString("artisan_name"));
littleArtisan.setArtisanDesc(rs
.getString("artisan_desc"));
}
});
return littleArtisan;
}
}
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ehcache的配置文件
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd"
updateCheck="true"
monitoring="autodetect"
dynamicConfig="true">
<diskStore path="java.io.tmpdir" />
<cache name="littleArtisan"
maxEntriesLocalHeap="100"
maxEntriesLocalDisk="1000"
eternal="false"
timeToIdleSeconds="300"
timeToLiveSeconds="600"
memoryStoreEvictionPolicy="LFU"
transactionalMode="off">
<persistence strategy="localTempSwap" />
</cache>
</ehcache>
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Spring-EhCache配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache.xsd">
<!-- 扫描注入注解,比如@Autowired -->
<context:component-scan base-package="com.xgj.cache.springCacheXml"/>
<!-- 使用context命名空间,加载数据库的properties文件 -->
<context:property-placeholder location="classpath:spring/jdbc.properties" />
<!-- 数据库 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close"
p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.url}"
p:username="${jdbc.username}"
p:password="${jdbc.password}" />
<!-- 配置namedParameterJdbcTemplate模板 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg ref="dataSource"/>
</bean>
<!-- 定义需要使用缓存的类 -->
<bean id="littleArtisanSpringCacheService" class="com.xgj.cache.springCacheXmlEhCache.service.LittleArtisanSpringCacheService"/>
<!-- 缓存管理器 Ehcache实现-->
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager"
p:cache-manager-ref="ehcacheManager"/>
<bean id="ehcacheManager"
class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
p:config-location="ehcache/ehcache-spring.xml"/>
<!-- 缓存定义 -->
<cache:advice id="cacheAdvice" cache-manager="cacheManager" >
<cache:caching cache="littleArtisan"> <!-- 公共缓存littleArtisan -->
<cache:cacheable method="getArtisan" key="#artisanName"/> <!-- getArtisan使用 Cacheable -->
<cache:cache-evict method="reloadArtisan" all-entries="true"/><!-- reloadArtisan使用 CacheEvict -->
</cache:caching>
</cache:advice>
<!-- 切面增强 -->
<aop:config>
<aop:pointcut id="cachePoint" expression="execution(* com.xgj.cache.springCacheXmlEhCache.service.LittleArtisanSpringCacheService.*(..))" />
<aop:advisor advice-ref="cacheAdvice"
pointcut-ref="cachePoint"/>
</aop:config>
</beans>
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上面的配置使用了一个Spring提供的EhCacheCacheManager来生成一个Spring的CacheManager,其接收一个Ehcache的CacheManager,因为真正用来存入缓存数据的还是Ehcache。
Ehcache的CacheManager是通过Spring提供的EhCacheManagerFactoryBean来生成的,其可以通过指定ehcache的配置文件位置来生成一个Ehcache的CacheManager。
若未指定则将按照Ehcache的默认规则取classpath根路径下的ehcache.xml文件,若该文件也不存在,则获取Ehcache对应jar包中的ehcache-failsafe.xml文件作为配置文件。
单元测试
package com.xgj.cache.springCacheXmlEhCache.service;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.xgj.cache.springCacheXmlEhCache.domain.LittleArtisan;
public class TestXmlCacheEhcache {
ClassPathXmlApplicationContext context = null;
LittleArtisanSpringCacheService service = null;
LittleArtisan littleArtisan;
@Before
public void initContext() {
// 启动Spring 容器
context = new ClassPathXmlApplicationContext(
"classpath:com/xgj/cache/springCacheXmlEhCache/conf_spring_ehcache.xml");
}
@Test
public void testXmlCache() {
service = context.getBean("littleArtisanSpringCacheService",
LittleArtisanSpringCacheService.class);
// 第一次 从数据库加载
littleArtisan = service.getArtisan("littleArtisan");
printArtisan();
// 第二次 从缓存加载
littleArtisan = service.getArtisan("littleArtisan");
printArtisan();
// 清空缓存
service.reloadArtisan();
// 再次查询,从数据库加载
service.getArtisan("littleArtisan");
printArtisan();
// 又查询,从缓存加载
service.getArtisan("littleArtisan");
printArtisan();
}
private void printArtisan() {
System.out.println(littleArtisan.getArtisanName() + "||"
+ littleArtisan.getArtisanDesc());
}
@After
public void releaseContext() {
if (context != null) {
context.close();
}
}
}
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日志输出
2017-10-04 11:12:56,227 INFO [main] (AbstractApplicationContext.java:583) - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@683a412e: startup date [Wed Oct 04 11:12:56 BOT 2017]; root of context hierarchy
2017-10-04 11:12:56,324 INFO [main] (XmlBeanDefinitionReader.java:317) - Loading XML bean definitions from class path resource [com/xgj/cache/springCacheXmlEhCache/conf_spring_ehcache.xml]
2017-10-04 11:12:57,559 INFO [main] (EhCacheManagerFactoryBean.java:130) - Initializing EhCache CacheManager
查找Artisan:littleArtisan
getFromDB
littleArtisan||EhCache
littleArtisan||EhCache
cache cleared
查找Artisan:littleArtisan
getFromDB
littleArtisan||EhCache
littleArtisan||EhCache
2017-10-04 11:12:58,901 INFO [main] (AbstractApplicationContext.java:984) - Closing org.springframework.context.support.ClassPathXmlApplicationContext@683a412e: startup date [Wed Oct 04 11:12:56 BOT 2017]; root of context hierarchy
2017-10-04 11:12:58,901 INFO [main] (EhCacheManagerFactoryBean.java:187) - Shutting down EhCache CacheManager
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日志分析
第一次从数据库中加载,第二次没有打印getFromDB,说明是从缓存中取的数据。 然后清空缓存,第一次从数据库中加载,第二次从缓存中取的数据。
示例源码
代码已托管到Github—> https://github.com/yangshangwei/SpringMaster
文章来源: artisan.blog.csdn.net,作者:小小工匠,版权归原作者所有,如需转载,请联系作者。
原文链接:artisan.blog.csdn.net/article/details/78159903
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