springboot集成本地缓存Caffeine的三种使用方式(小结)

目录

• 第一种方式（只使用Caffeine）
• 第二种方式(使用Caffeine和spring cache)
• 第三种方式(使用Caffeine和spring cache)

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

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