Springboot整合GuavaCache缓存过程解析

<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>

/**
 * 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;
  }
}

/**
 * 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();
  }
}

/**
 * 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();
  }

}

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 ****************");
  }
}