redis延迟队列实现

最近项目中，有一个需求是需要用到延迟队列的，最开始使用的RocketMQ来实现，后面发现使用RocketMQ时，总是会丢消息，在网上百度下，发现还可以使用redis来做延迟消息，所以就把之前的RocketMQ改成Redis。

延迟消息任务：

@Data
public class DelayTask {
	// 消息id
    private String id;
    // 任务名称
    private String taskName;
    // 具体任务内容
    private T msg;

}

Redis延迟队列监听：

@Component
@Slf4j
public class RedisDealyTaskLister implements CommandLineRunner {

	@Resource
	private RedisTemplate redisTemplate;

	@Resource
	private ISplitOrderService iSplitOrderService;

	@Resource
	private SccOrderProperties sccOrderProperties;

	private String delayQueueName = "delayQueue";

	@Override
	public void run(String... args) throws Exception {
		Executors.newSingleThreadExecutor().submit(new Runnable() {
			@Override
			public void run() {
				while (true) {
					// 获取一个到点的消息
					Set set = redisTemplate.opsForZSet().rangeByScore(delayQueueName, 0, System.currentTimeMillis(), 0, 1);
					log.info("RedisDealyTaskLister set={},time={}",Func.toJson(set),LocalDateTime.now());
					// 如果没有，就等等
					if (set.isEmpty()) {
						try {
							Thread.sleep(sccOrderProperties.getDelayRedisTime());
						} catch (InterruptedException e) {
							log.info("RedisDealyTaskLister run e={}",e);
						}
						// 继续执行
						continue;
					}
					// 获取具体消息的key
					String it = set.iterator().next();
					// 删除成功
					if (redisTemplate.opsForZSet().remove(delayQueueName, it) > 0) {
						// 拿到任务
						DelayTask delayTask = JSONObject.parseObject(it, DelayTask.class);
						log.info("RedisDealyTaskLister delayTask={},time={}",Func.toJson(delayTask),LocalDateTime.now());
						OrderDetailInfo orderDetailInfo = JSONObject.parseObject(Func.toJson(delayTask.getMsg()), OrderDetailInfo.class);
						iSplitOrderService.invokeInsertNearestCargo(orderDetailInfo);
						log.info("消息到期msg={},time={}",delayTask.getMsg().toString(), LocalDateTime.now());
					}
				}
			}
		});


	}
}

Redis延迟队列：

@Slf4j
public class RedisDelayQueue {
    /**
     * 延迟队列名称
     */
    private String delayQueueName = "delayQueue";

	private RedisTemplate redisTemplate;

    // 传入redis客户端操作
    public RedisDelayQueue(RedisTemplate redisTemplate, String delayQueueName) {
        this.redisTemplate = redisTemplate;
        this.delayQueueName = delayQueueName;
    }
    /**
     * 设置延迟消息
     */
    public void setDelayTasks(T msg, long delayTime) {
        DelayTask delayTask = new DelayTask<>();
        delayTask.setId(UUID.randomUUID().toString());
        delayTask.setMsg(msg);
        Boolean addResult = redisTemplate.opsForZSet().add(delayQueueName, JSONObject.toJSONString(delayTask), delayTime);
        if(addResult){
			log.info("添加任务成功！delayTask={},当前时间为time={}",JSONObject.toJSONString(delayTask),LocalDateTime.now());
        }
    }