Springboot整合GuavaCache缓存过程解析

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:


  org.springframework.boot
  spring-boot-starter-cache
  1.5.9.RELEASE



  com.google.guava
  guava
  19.0

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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