redis实现延时队列的两种方式(小结)

notify-keyspace-events Ex

@Component
@Slf4j
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {

  @Autowired
  private KafkaProducerService kafkaProducerService;

  public RedisKeyExpirationListener(RedisMessageListenerContainer listenerContainer) {
    super(listenerContainer);
  }

  /**
   * 针对 redis 数据失效事件，进行数据处理
   * @param message
   * @param pattern
   */
  @Override
  public void onMessage(Message message, byte[] pattern){
    if(message == null || StringUtils.isEmpty(message.toString())){
      return;
    }
    String content = message.toString();
    //key的格式为  flag:时效类型:运单号 示例如下
    try {
      if(content.startsWith(AbnConstant.EMS)){
        kafkaProducerService.sendMessageSync(TopicConstant.EMS_WAYBILL_ABN_QUEUE,content);
      }else if(content.startsWith(AbnConstant.YUNDA)){
        kafkaProducerService.sendMessageSync(TopicConstant.YUNDA_WAYBILL_ABN_QUEUE,content);
      }
    } catch (Exception e) {
      log.error("监控过期key，发送kafka异常，",e);
    }
  }
}

public void produce(Integer taskId, long exeTime) {
  System.out.println("加入任务， taskId: " + taskId + ", exeTime: " + exeTime + ", 当前时间：" + LocalDateTime.now());
  RedisOps.getJedis().zadd(RedisOps.key, exeTime, String.valueOf(taskId));
}

public void consumer() {
  Executors.newSingleThreadExecutor().submit(new Runnable() {
    @Override
    public void run() {
      while (true) {
        Set<String> taskIdSet = RedisOps.getJedis().zrangeByScore(RedisOps.key, 0, System.currentTimeMillis(), 0, 1);
        if (taskIdSet == null || taskIdSet.isEmpty()) {
          System.out.println("没有任务");
 
        } else {
          taskIdSet.forEach(id -> {
            long result = RedisOps.getJedis().zrem(RedisOps.key, id);
            if (result == 1L) {
              System.out.println("从延时队列中获取到任务，taskId:" + id + " , 当前时间：" + LocalDateTime.now());
            }
          });
        }
        try {
          TimeUnit.MILLISECONDS.sleep(100);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    }
  });
}