@Cacheable设置过期时间

@Cacheable设置过期时间

参考：https://blog.csdn.net/liuyueyi25/article/details/118422143

使用@Cacheable时，无法直接设置过期时间，需要自定义RedisCacheManager来实现ttl设置。

注意：项目中已配置了RedisCacheManager需要在原配置的bean上添加注解**@Primary**，以免造成干扰

	/**
		自定义RedisCacheManager，用于在使用@Cacheable时设置ttl
	 */
	@Bean
	public RedisCacheManager selfCacheManager(RedisTemplate<String, Object> redisTemplate) {
		RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisTemplate.getConnectionFactory());
		RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
				.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(redisTemplate.getValueSerializer()));
		return new TtlRedisCacheManager(redisCacheWriter, redisCacheConfiguration);
	}

其中return的TtlRedisCacheManager定义如下：

public class TtlRedisCacheManager extends RedisCacheManager {
    public TtlRedisCacheManager(RedisCacheWriter cacheWriter, RedisCacheConfiguration defaultCacheConfiguration) {
        super(cacheWriter, defaultCacheConfiguration);
    }

    @Override
    protected RedisCache createRedisCache(String name, RedisCacheConfiguration cacheConfig) {
        String[] cells = StringUtils.delimitedListToStringArray(name, "=");
        name = cells[0];
        if (cells.length > 1) {
            long ttl = Long.parseLong(cells[1]);
            // 根据传参设置缓存失效时间，默认单位是秒
            cacheConfig = cacheConfig.entryTtl(Duration.ofSeconds(ttl));
        }
        return super.createRedisCache(name, cacheConfig);
    }
}

使用时在value/cacheNames结尾拼接 =多少秒，

//value、cacheNames是等效的,ttl=600s，unless是不缓存的结果（为null时不缓存）
@Cacheable(value = "p_user=600"，key = "#menu '_' #type '_' #userId"，cacheManager = "selfCacheManager", unless = "#result == null"）
public User getUser(...){
    xxx
}

//当前方法执行时对应的key失效,也可以用@CachePut在当前方法执行时更新key
@CacheEvict(cacheNames = "p_user"，key = "#p.menu '_' #p.type '_' #p.user"）
public boolean setUser(User p){
    xxx
}

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