这篇文章主要介绍了springboot整合GuavaCache缓存过程解析,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
Guava Cache是一种本地缓存机制,之所以叫本地缓存,是因为它不会把缓存数据放到外部文件或者其他服务器上,而是存放到了应用内存中。
Guava Cache的优点是:简单、强大、轻量级。
GuavaCache适用场景:
1.某些接口或者键值会被查询多次以上;
2.愿意使用或牺牲一些内存空间来提升访问或者计算速度;
3.缓存内容或者结果值较小,不会超过内存总容量;
GuavaCache中基于注解的声明式缓存操作
@Cacheable 触发缓存逻辑
Spring 在执行 @Cacheable 标注的方法前先查看缓存中是否有数据,如果有数据,则直接返回缓存数据;若没有数据,执行该方法并将方法返回值放进缓存。
参数: value缓存名、 key缓存键值、 condition满足缓存条件、unless否决缓存条件
@CacheEvict
触发缓存逐出逻辑
方法执行成功后会从缓存中移除相应数据。
参数: value缓存名、 key缓存键值、 condition满足缓存条件、 unless否决缓存条件、 allEntries是否移除所有数据 (设置为true时会移除所有缓存)
@CachePut
和 @Cacheable 类似,但会把方法的返回值放入缓存中, 主要用于数据新增和修改方法。
pom.xml配置文件:
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> <version>1.5.9.RELEASE</version> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>19.0</version> </dependency>
GuavaCacheConfig:
/** * Copyright (c) 2020, All Rights Reserved. * */ package com.demo.server.config; import java.util.concurrent.TimeUnit; import org.springframework.cache.CacheManager; import org.springframework.cache.annotation.EnableCaching; import org.springframework.cache.guava.GuavaCacheManager; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import com.google.common.cache.CacheBuilder; @Configuration @EnableCaching public class GuavaCacheConfig { @Bean public CacheManager cacheManager() { GuavaCacheManager cacheManager = new GuavaCacheManager(); cacheManager.setCacheBuilder( CacheBuilder.newBuilder(). expireAfterWrite(10, TimeUnit.SECONDS). //存活时间10秒 maximumSize(1000)); //最大线程数 return cacheManager; } }
CacheController:
/** * Copyright (c) 2020, All Rights Reserved. * */ package com.demo.server.guava; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping(value = "/guava") public class CacheController { @Autowired private CacheService cacheService; /** * 查询方法 */ @RequestMapping(value = "/get", method = RequestMethod.GET) public String getByCache() { Long startTime = System.currentTimeMillis(); long timestamp = this.cacheService.getByCache(); Long endTime = System.currentTimeMillis(); System.out.println("耗时: " + (endTime - startTime)); return timestamp+""; } /** * 保存方法 */ @RequestMapping(value = "/save", method = RequestMethod.POST) public void save() { this.cacheService.save(); } /** * 删除方法 */ @RequestMapping(value = "delete", method = RequestMethod.DELETE) public void delete() { this.cacheService.delete(); } }
CacheService:
/** * Copyright (c) 2020, All Rights Reserved. * */ package com.demo.server.guava; import java.sql.Timestamp; import org.springframework.cache.annotation.CacheEvict; import org.springframework.cache.annotation.CachePut; import org.springframework.cache.annotation.Cacheable; import org.springframework.stereotype.Service; @Service public class CacheService { @CachePut(value = "guavacache") public long save() { long timestamp = new Timestamp(System.currentTimeMillis()).getTime(); System.out.println("进行缓存:" + timestamp); return timestamp; } @CacheEvict(value = "guavacache") public void delete() { System.out.println("删除缓存"); } @Cacheable(value = "guavacache") public long getByCache() { try { Thread.sleep(3 * 1000); } catch (InterruptedException e) { e.printStackTrace(); } return new Timestamp(System.currentTimeMillis()).getTime(); } }
Application:
package com.demo; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.boot.Banner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { private static final Logger LOG = LoggerFactory.getLogger(Application.class); public static void main(String[] args) { SpringApplication app = new SpringApplication(Application.class); app.setBannerMode(Banner.Mode.OFF); app.setWebEnvironment(true); app.run(args); LOG.info("**************** Startup Success ****************"); } }
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