基于Redis的限流器的实现(示例讲解)

/**
 * 获取限流权限
 * @param key
 * @param millisecond 毫秒数
 * @param limitCount 限流次数
 * @return
 */
public static boolean getCurrentLimiting(String key, Long millisecond, Integer limitCount){
  try {
    boolean currentLimitingLock = RedisDistributeLockUtil.lock(key);
    if(currentLimitingLock){
      Long llen = RedisClient.llen(getCurrentLimitingRedisKey(key));
      if(llen < limitCount){
        RedisClient.lpush(getCurrentLimitingRedisKey(key), DateUtil.current(false) + "");
        return true;
      }else{
        Long lastTime = Long.parseLong(RedisClient.lindex(getCurrentLimitingRedisKey(key), -1));
        if((DateUtil.current(false) - lastTime) >= millisecond){
          RedisClient.lpush(getCurrentLimitingRedisKey(key), DateUtil.current(false) + "");
          RedisClient.ltrim(getCurrentLimitingRedisKey(key), 0, limitCount);
          return true;
        }
      }
    }
  }finally {
    RedisDistributeLockUtil.unlock(key);
  }
  return false;
}