Spring Cache抽象-基于XML的配置声明（基于ConcurrentMap的配置）

概述

Spring Cache基于注解的配置

如果不想使用注解或者由于其他原因无法获得项目的源码等，Spring也支持使用XML的方式配置Spring Cache,主要是通过类似于aop:advice的cache:advice来进行的。

在cache命名空间下定义了一个cache:advice元素用来定义一个对于Cache的advice。其需要指定一个cache-manager属性，默认为cacheManager。

cache:advice下面可以指定多个cache:caching元素，其有点类似于使用注解时的@Caching注解。

cache:caching元素下又可以指定cache:cacheable、cache:cache-put和cache:cache-evict元素，它们类似于使用注解时的@Cacheable、@CachePut和@CacheEvict。

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示例

项目结构：

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数据库表数据（Oracle）：

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实体类

package com.xgj.cache.springCacheXml.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.springCacheXml.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.springCacheXml.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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Spring配置文件

<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">

    
    <context:component-scan base-package="com.xgj.cache.springCacheXml"/>

    
    <context:property-placeholder location="classpath:spring/jdbc.properties" />

    
    <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}" />

    
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
         <constructor-arg ref="dataSource"/>
    bean>



    
    <bean id="littleArtisanSpringCacheService"  class="com.xgj.cache.springCacheXml.service.LittleArtisanSpringCacheService"/>

    
    <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
      <property name="caches">
         <set>
            <bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean" p:name="littleArtisan"/>
         set>
      property>
    bean>

    
    <cache:advice  id="cacheAdvice" cache-manager="cacheManager" >
        <cache:caching cache="littleArtisan"> 
            <cache:cacheable method="getArtisan" key="#artisanName"/> 
            <cache:cache-evict method="reloadArtisan" all-entries="true"/>
        cache:caching>
    cache:advice>

    
    <aop:config>
        <aop:pointcut id="cachePoint" expression="execution(* com.xgj.cache.springCacheXml.service.LittleArtisanSpringCacheService.*(..))" />
        <aop:advisor advice-ref="cacheAdvice" 
                     pointcut-ref="cachePoint"/>    
    aop:config>

beans>

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单元测试

package com.xgj.cache.springCacheXml.service;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.xgj.cache.springCacheXml.domain.LittleArtisan;

public class TestXmlCache {

    ClassPathXmlApplicationContext context = null;
    LittleArtisanSpringCacheService service = null;
    LittleArtisan littleArtisan;
    @Before
    public void initContext() {
        // 启动Spring 容器
        context = new ClassPathXmlApplicationContext(
                "classpath:com/xgj/cache/springCacheXml/conf_spring.xml");
    }

    @Test
    public void testXmlCache() {

        service = context.getBean(
                "littleArtisanSpringCacheService",
                LittleArtisanSpringCacheService.class);
        // 第一次 从数据库加载
        littleArtisan = service.getArtisan("masterArtisan");
        printArtisan();
        // 第二次 从缓存加载
        littleArtisan = service.getArtisan("masterArtisan");
        printArtisan();
        // 清空缓存
        service.reloadArtisan();
        // 再次查询，从数据库加载
        service.getArtisan("masterArtisan");
        printArtisan();
        // 又查询，从缓存加载
        service.getArtisan("masterArtisan");
        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 08:40:00,529  INFO [main] (AbstractApplicationContext.java:583) - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@403d0d64: startup date [Wed Oct 04 08:40:00 BOT 2017]; root of context hierarchy
2017-10-04 08:40:00,623  INFO [main] (XmlBeanDefinitionReader.java:317) - Loading XML bean definitions from class path resource [com/xgj/cache/springCacheXml/conf_spring.xml]
查找Artisan：masterArtisan
getFromDB
masterArtisan||Spring Cache
masterArtisan||Spring Cache
cache cleared
查找Artisan：masterArtisan
getFromDB
masterArtisan||Spring Cache
masterArtisan||Spring Cache
2017-10-04 08:40:03,433  INFO [main] (AbstractApplicationContext.java:984) - Closing org.springframework.context.support.ClassPathXmlApplicationContext@403d0d64: startup date [Wed Oct 04 08:40:00 BOT 2017]; root of context hierarchy

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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。

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示例源码

代码已托管到Github—> https://github.com/yangshangwei/SpringMaster