springboot集成本地缓存Caffeine的三种使用方式(小结)

第一种方式（只使用Caffeine）

gradle添加依赖

dependencies {
   implementation 'org.springframework.boot:spring-boot-starter-jdbc'
   implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
   implementation 'org.springframework.boot:spring-boot-starter-web'
   implementation 'org.mybatis.spring.boot:mybatis-spring-boot-starter:2.1.3'
   runtimeOnly 'mysql:mysql-connector-java'
   compileOnly 'org.projectlombok:lombok'
   annotationProcessor 'org.projectlombok:lombok'
   testImplementation('org.springframework.boot:spring-boot-starter-test') {
       exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
   }
   compile group: 'com.github.ben-manes.caffeine', name: 'caffeine', version: '2.8.4'
//    compile('org.springframework.boot:spring-boot-starter-cache')
}

编写配置类

package org.example.base.config;

import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.concurrent.TimeUnit;

/**
* @author l
* @date Created in 2020/10/27 11:05
*/
@Configuration
//@EnableCaching
public class CacheConfig {

@Bean(value = "caffeineCache")
   public Cache<String, Object> caffeineCache() {
       return Caffeine.newBuilder()
               // 设置最后一次写入或访问后经过固定时间过期
               .expireAfterWrite(60, TimeUnit.SECONDS)
               // 初始的缓存空间大小
               .initialCapacity(1000)
               // 缓存的最大条数
               .maximumSize(10000)
               .build();

}

@Bean(value = "caffeineCache2")
   public Cache<String, Object> caffeineCache2() {
       return Caffeine.newBuilder()
               // 设置最后一次写入或访问后经过固定时间过期
               .expireAfterWrite(120, TimeUnit.SECONDS)
               // 初始的缓存空间大小
               .initialCapacity(1000)
               // 缓存的最大条数
               .maximumSize(10000)
               .build();

}

}

测试

package org.example.base;

import com.github.benmanes.caffeine.cache.Cache;
import org.example.base.bean.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class BaseApplicationTests {

@Qualifier("caffeineCache")
@Autowired
   Cache<String, Object> cache;

@Qualifier("caffeineCache2")
@Autowired
Cache<String, Object> cache2;

@Test
   public void test() {
       User user = new User(1, "张三", 18);
       cache.put("123", user);
       User user1 = (User) cache.getIfPresent("123");
       assert user1 != null;
       System.out.println(user1.toString());
       User user2 = (User) cache2.getIfPresent("1234");
       System.out.println(user2 == null);
   }

}

输出

第二种方式(使用Caffeine和spring cache)

gradle添加依赖

dependencies {
   implementation 'org.springframework.boot:spring-boot-starter-jdbc'
   implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
   implementation 'org.springframework.boot:spring-boot-starter-web'
   implementation 'org.mybatis.spring.boot:mybatis-spring-boot-starter:2.1.3'
   runtimeOnly 'mysql:mysql-connector-java'
   compileOnly 'org.projectlombok:lombok'
   annotationProcessor 'org.projectlombok:lombok'
   testImplementation('org.springframework.boot:spring-boot-starter-test') {
       exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
   }
   compile group: 'com.github.ben-manes.caffeine', name: 'caffeine', version: '2.8.4'
   compile('org.springframework.boot:spring-boot-starter-cache')
}

编写配置类

package org.example.base.config;

import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.caffeine.CaffeineCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.time.Duration;
import java.util.ArrayList;

/**
* @author l
* @date Created in 2020/10/27 11:05
*/
@Configuration
@EnableCaching
public class CacheConfig {

public enum CacheEnum {
       /**
        * @date 16:34 2020/10/27
        * 第一个cache
        **/
       FIRST_CACHE(300, 20000, 300),
       /**
        * @date 16:35 2020/10/27
        * 第二个cache
        **/
       SECOND_CACHE(60, 10000, 200);

private int second;
       private long maxSize;
       private int initSize;

CacheEnum(int second, long maxSize, int initSize) {
           this.second = second;
           this.maxSize = maxSize;
           this.initSize = initSize;
       }

}

@Bean("caffeineCacheManager")
   public CacheManager cacheManager() {
       SimpleCacheManager cacheManager = new SimpleCacheManager();
       ArrayList<CaffeineCache> caffeineCaches = new ArrayList<>();
       for (CacheEnum cacheEnum : CacheEnum.values()) {
           caffeineCaches.add(new CaffeineCache(cacheEnum.name(),
                   Caffeine.newBuilder().expireAfterWrite(Duration.ofSeconds(cacheEnum.second))
                           .initialCapacity(cacheEnum.initSize)
                           .maximumSize(cacheEnum.maxSize).build()));
       }
       cacheManager.setCaches(caffeineCaches);
       return cacheManager;
   }

//    @Bean("FIRST_CACHE")
//    public Cache firstCache(CacheManager cacheManager) {
//        return cacheManager.getCache("FIRST_CACHE");
//    }
//
//    @Bean("SECOND_CACHE")
//    public Cache secondCache(CacheManager cacheManager) {
//        return cacheManager.getCache("SECOND_CACHE");
//    }

}

编写service层

package org.example.base;

import org.example.base.bean.User;
import org.example.base.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class BaseApplicationTests {

@Autowired
   private UserService userService;

@Test
   public void test() {
       User user = new User(123,"jack l",18);
       userService.setUser(user);
       System.out.println(userService.getUser("123"));
   }

}

测试

package org.example.base;

import org.example.base.bean.User;
import org.example.base.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class BaseApplicationTests {

@Autowired
   private UserService userService;

@Test
   public void test() {
       User user = new User(123,"jack l",18);
       userService.setUser(user);
       System.out.println(userService.getUser("123"));
   }

}

输出结果

第三种方式(使用Caffeine和spring cache)

• gradle依赖添加同方式二

• 配置类添加方式同方式二

• 编写service层

package org.example.base.service.impl;

import org.example.base.bean.User;
import org.example.base.service.UserService;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

/**
* @author l
* @date Created in 2020/10/23 14:47
*/
@Service
//@CacheConfig(cacheNames = "SECOND_CACHE",cacheManager = "caffeineCacheManager")
public class UserServiceImpl implements UserService {

/**
    * 使用@CachePut注解的方法，一定要有返回值，该注解声明的方法缓存的是方法的返回结果。
    * it always causes the
    * method to be invoked and its result to be stored in the associated cache
    **/
   @Override
   @CachePut(key = "#user.getId()", value = "SECOND_CACHE", cacheManager = "caffeineCacheManager")
   public User setUser(User user) {
       System.out.println("已经存储进缓存了");
       return user;
   }

@Override
   @CacheEvict(value = "SECOND_CACHE",cacheManager = "caffeineCacheManager")
   public void deleteUser(Integer id) {
       System.out.println("缓存删除了");
   }

@Override
   @Cacheable(key = "#id", value = "SECOND_CACHE", cacheManager = "caffeineCacheManager")
   public User getUser(Integer id) {
       System.out.println("从数据库取值");
       //模拟数据库中的数据
      return null;
   }

}

测试

package org.example.base;

import org.example.base.bean.User;
import org.example.base.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class BaseApplicationTests {

@Autowired
   private UserService userService;

@Test
   public void test4(){
       User user1 = new User(123, "jack l", 18);
       userService.setUser(user1);
       System.out.println("从缓存中获取 "+userService.getUser(123));
       System.out.println(userService.getUser(123322222));
       userService.deleteUser(123);
       System.out.println(userService.getUser(123));

}

}

输出结果

来源：https://blog.csdn.net/qq_41921994/article/details/109313445