DelayQueue延时队列

需求场景

(Delay)代码需要延时执行,(Queue)需要不断失败重试

实例

当前时间延时5s执行Task,并在Task中添加一个指定时间执行的延时队列

try { 
     //第一个参数: 延时任务中需要使用的参数对象,
     //第二个参数: 传入new Date()作为延时的基准时间 
     DelayGetPrise delay = new DelayGetPrise(asset, new Date());
     GetOpenPriseTask.addtask(delay);
} catch (Exception e) {
     e.printStackTrace();
}

/**
 * @Auther: Young
 * @Date: 2019/4/13 10:28
 * @Description:
 */
@Data
public class DelayGetPrise  implements Delayed {

    public DelayGetPrise(Asset asset, Date endDate)
    {
        this.asset = asset;
        this.endDate = endDate.getTime();
    }

    private long endDate;

    private Asset asset;  //获取的时间

    @Override
    //调用处传入时间的基础上延时 5s钟后执行task
    public long getDelay(TimeUnit unit) {
        return (endDate + 5000) - System.currentTimeMillis();
    }

    @Override
    public int compareTo(Delayed o) {
        DelayGetPrise jia = (DelayGetPrise) o;
        if (this.endDate - jia.getEndDate() > 0)
            //时间到达
            return 1;
        else
            return 0;
    }
}

/**
 * @Auther: Young
 * @Date: 2019/4/13 10:27
 * @Description:该方法继承AfterSpringLoaded,项目启动后就加载Task,初始化队列等
 */
@Component
public class GetOpenPriseTask implements AfterSpringLoaded {

    private static final Logger logger = LoggerFactory.getLogger(GetOpenPriseTask.class);

    @Autowired
    private AssetService assetService;

    @Autowired
    private MarketService marketService;

    private static final BlockingQueue getOpenPriseQueue = new DelayQueue();

    public static void addtask(DelayGetPrise dalay) {
        getOpenPriseQueue.add(dalay);
    }

    @Override
    public void load() {
        while (true) {
            try {
                logger.info("task任务 开始");
                DelayGetPrise prise = getOpenPriseQueue.take();
                try {
                    Asset asset = prise.getAsset();
                    ...
                    //失败重试
                    if (失败) {
                        logger.error("Task任务 数据异常,重试");
                        //注意此处传入的时间
                        DelayGetPrise newDelay = new DelayGetPrise(asset, new Date());
                        GetOpenPriseTask.addtask(newDelay);
                        //此处不能用break,否则会跳出while(true),关闭队列
                        continue;
                    } else {
                        logger.info("Task任务 正常逻辑执行");
                        ...
                        logger.info("Task任务完成");

                        LFExcuter.excute(() -> {
                             try {
                                  //指定时间延时Task
                                  int delay = asset.getPeriodValue().multiply(new BigDecimal(6)).intValue();
                                  Calendar calUp = Calendar.getInstance();
                                  int delaysecond = RandomUtil.randomInt(delay + 1);
                                  calUp.add(Calendar.SECOND, delaysecond);
                                  logger.info("指定时间：delay: " + delaysecond + "秒");
                                  //在计算好的时间基础上延时
                                  DelayAutoBuy delayAutoUp = new DelayAutoBuy(asset, calUp.getTime(), ExchangeConstant.ORDER_TYPE.UP);
                                  AutoBuyTask.addtask(delayAutoUp);
                                } catch (Exception e) {
                                    logger.error("指定时间Task任务", e);
                                }
                            });
                        }
                } catch (Exception e) {
                    logger.error("获取队列错误,重试Task任务", e);
                    GetOpenPriseTask.addtask(prise);
                }
            } catch (Exception e) {
                logger.error("指定时间Task任务 异常:", e);
            }
            logger.info("Task任务 结束");
        }
    }
}