jetCache使用

ゞ浴缸里的玫瑰 2023-06-30 09:10 13阅读 0赞

## 配置 ##

boot依赖

<dependency>
                <groupId>com.alicp.jetcache</groupId>
                <artifactId>jetcache-starter-redis</artifactId>
                <version>2.5.15</version>
            </dependency>

连接

jetcache:
      statIntervalMinutes: 15
      areaInCacheName: false
      local:
        default:
          type: linkedhashmap
          keyConvertor: fastjson
          limit: 100
      remote:
        default:
          type: redis
          keyConvertor: fastjson
          valueEncoder: java
          valueDecoder: java
          poolConfig:
            minIdle: 5
            maxIdle: 20
            maxTotal: 50
          host: 47.103.116.160
          port: 8226
          password: Zc2019YuRenJie

配置，EnableMethodCache，EnableCreateCacheAnnotation这两个注解分别激活Cached和CreateCache注解

@Configuration
    @EnableMethodCache(basePackages = "org.study")
    @EnableCreateCacheAnnotation
    public class JetCacheConfig {
    }

## 使用方法1，@CreateCache ##

@Service
    public class JetCacheServiceImpl implements JetCacheService {
        @CreateCache(name = "user_cache:", expire = 3600, cacheType = CacheType.BOTH, localLimit = 50)
        private Cache<Integer, User> userCache;
    
        @Override
        public User getUserById(Integer userId) {
            User user = userCache.get(userId);
            if (user == null) {
                user = new User(userId, "lipo");
                userCache.put(userId, user);
            }
            return user;
        }
    
        @Override
        public void updateUser(User user) {
            userCache.put(user.getId(), user);
            System.out.println("updateUser: " + user);
    
        }
    
        @Override
        public void deleteUser(Integer userId) {
            userCache.remove(userId);
            System.out.println("deleteUser :" + userId);
        }
    }

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class User implements Serializable {
        private Integer id;
        private String name;
    }

name属性，用冒号结尾，多个缓存可以合拢。保存的是二进制数据，看不了内容。实体类必须实现序列化。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pbmd3dWxpcG8_size_16_color_FFFFFF_t_70]

## 方法二，方法注解 ##

public interface JetCacheService2 {
        @Cached(name = "student_cache:", key = "#id", expire = 3600)
        User getUserById(Integer id);
    
        @CacheUpdate(name = "student_cache:", key = "#user.id", value = "#user")
        void updateUser(User user);
    
        @CacheInvalidate(name = "student_cache:", key = "#id")
        void deleteUser(Integer id);
    }

1.在接口方法上加注解，name以冒号结尾，key用spel表达式。  
2.name如果不指定，默认是类的全限定名（包名都用首字母代替），结尾没有冒号，多个缓存不合并，显示不好，所以name必须手动指定。  
![在这里插入图片描述][20200116162110720.png]  
3.注解用在接口方法和接口实现类的方法上，都有效果，在实现类上更好。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pbmd3dWxpcG8_size_16_color_FFFFFF_t_70 1]  
4.方法二不修改逻辑代码，方法一需要修改业务逻辑，所以使用方法二。

项目https://github.com/mingwulipo/redis-demo

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[20200116162110720.png]: https://img-blog.csdnimg.cn/20200116162110720.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pbmd3dWxpcG8_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200116162331888.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pbmd3dWxpcG8=,size_16,color_FFFFFF,t_70