谷粒商城 缓存

1. 导入依赖
2. 指定缓存类型
3. @EnableCache
4. 使用注解

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
          <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

  cache:
    type: redis

注解

@Caching 组合以上多个操作
@CacheEvict 删除缓存
@Cacheable 保存到缓存
@CachePut 不影响方法执行更新缓存
@CacheConfig 在类级别共享缓存的相同配置

配置

json需要配一下，不然序列化复杂数据类型会抛异常

@Configuration
@EnableCaching  // 默认配置缓存null（缓存穿透）
public class CacheConfig {
    @Resource  
    RedisCacheConfiguration config;
    @Bean
    public RedisCacheConfiguration cacheConfiguration() {
        return RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofMillis(3000)) // 过期时间
                .disableKeyPrefix() // key 不添加前缀
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer())); // value 使用JSON序列化方式
    }
}

@Cacheable 保存到缓存

@Override
@Cacheable(cacheNames = "catalogCache", key = "'catalog'")
public Map<String, List<Catalog2VO>> getCatalogJson() {
    RLock lock = client.getLock("catalogLock");
    lock.lock();
    Map<String, List<Catalog2VO>> data = null;
    try {
        data = getCatalogJsonByDB();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        lock.unlock();
    }
    return data;
}

@CacheEvict 删除缓存

    @Override
    @CacheEvict(cacheNames = "catalogCache", key = "'catalog'")
    public void updateCatelog(CategoryEntity entity) {
        this.updateById(entity);
    }

• 删除一个缓存分区下的所有键

   @CacheEvict(cacheNames = "catalogCache",allEntries = true)

@Caching 组合以上多个操作

 @Caching(cacheable = {
            @Cacheable(cacheNames = "catalogCache", key = "'catalog'"),
            @Cacheable(cacheNames = "catalogCache", key = "'catalog1'")
    })