Spring缓存源码剖析：（一）工欲善其事必先利其器

时间：2017-03-05 23:35:26 阅读：284 评论：0 收藏：0 [点我收藏+]

从本篇开始对Spring 4.3.6版本中Cache部分做一次深度剖析。剖析过程中会对其中使用到的设计模式以及原则进行分析。相信对设计内功修炼必定大有好处。

一、环境及工具

　　IntelliJ IDEA 2016.2

　　JDK 1.8

MacOS

二、测试用代码

　　目录整体结构是这个样子：

　　技术分享

BeanConfig 类，注册CacheManager以及扫描包下的Bean。

import com.studyspring.constants.CacheConstants;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by zhangmingbo on 2/23/17.
 */

@EnableCaching
@Configuration
@ComponentScan(basePackages = "com.studyspring")
public class BeanConfig {

    @Bean
    public CacheManager cacheManager() {
        ConcurrentMapCacheManager cacheManager = new ConcurrentMapCacheManager();
        cacheManager.setCacheNames(getCacheNames());
        return cacheManager;
    }

    public List<String> getCacheNames() {
        List<String> cacheNames = new ArrayList<String>();
        cacheNames.add(CacheConstants.CACHE_RANDOM);

        return cacheNames;
    }

}

Stage类，顾名思义，作为main方法所在类作为测试等入口。

import com.studyspring.cache.CacheTest;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * Created by zhangmingbo on 2/23/17.
 */
public class Stage {

    public Stage() {
    }

    public static void main(String[] args) {

        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(BeanConfig.class);

        CacheTest cacheTest = applicationContext.getBean(CacheTest.class);

        for (int i = 0; i < 5; i++) {
            System.out.println(cacheTest.getRandomInt());
        }
    }
}

CacheTest业务类

package com.studyspring.cache;

import com.studyspring.constants.CacheConstants;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Component;

/**
 * Created by zhangmingbo on 2/23/17.
 */

@Component
public class CacheTest {


    @Cacheable(cacheNames = CacheConstants.CACHE_RANDOM)
    public Double getRandomInt() {
        System.out.println("Call Random");
        return Math.random() * 100;
    }

}