DelayQueue延迟队列

实体类

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package com.delayqueue.demo.entity;
import lombok.Data;
import java.util.Date;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
/**
 * @author luoyangjie
 * @version 1.0
 * @date 2021/2/3 15:17
 */
@Data
public class Order implements Delayed {
    /**
     * 订单号
     */
    private String orderNo;
    /**
     * 用户id
     */
    private String userId;
    /**
     * 订单状态（0待领取，1已领取，2已勾销）
     */
    private Integer status;
    /**
     * 订单创立时间
     */
    private Date createTime;
    /**
     * 订单失效时间
     */
    private Date cancelTime;
    public Order(String orderNo, String userId, Integer status, Date createTime, Date cancelTime) {
        this.orderNo = orderNo;
        this.userId = userId;
        this.status = status;
        this.createTime = createTime;
        this.cancelTime = cancelTime;
    }
    @Override
    public String toString() {
        return "Order{" +
                "orderNo='" + orderNo + '\'' +
                ", userId='" + userId + '\'' +
                ", status=" + status +
                ", createTime=" + createTime +
                ", cancelTime=" + cancelTime +
                '}';
    }
    /**
     * 取得延迟时间，用失效时间-当前时间，时间单位须要对立
     * @param unit
     * @return
     */
    @Override
    public long getDelay(TimeUnit unit) {
        //上面用到unit.convert()办法，其实在这个小场景不须要用到，只是学习一下如何应用罢了
        return unit.convert(cancelTime.getTime() - System.currentTimeMillis(), TimeUnit.MILLISECONDS);
    }
    /**
     * 用于提早队列外部比拟排序，以后工夫的延迟时间 - 比拟对象的延迟时间
     * @param o
     * @return
     */
    @Override
    public int compareTo(Delayed o) {
        //这里依据勾销工夫来比拟，如果勾销所剩时间小的，就会优先被队列提取进去
        //注意延迟时间 的绑定就是这绑定的属性
        return this.getCancelTime().compareTo(((Order) o).getCancelTime());
    }
}

SERVICE

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/**
 * 提早队列，用来寄存订单对象
 */
DelayQueue<Order> queue = new DelayQueue<>();

@Resource
private ThreadPoolTaskExecutor executorService;

@Override
public void cancelOrder() {
    //新建一个线程，用来模仿定时排查取消过期订单job
    executorService.submit(()->{
        try {
            System.out.println("***********开启主动取消订单job***********,时间：" + DateUtil.date());
            while (isOpen == 1) {
                try {
                    Order order = queue.take();
                    order.setStatus(2);
                    System.out.println("订单：" + order.getOrderNo() + "付款超时，主动勾销，当前时间：" + DateUtil.date());
                    System.out.println("当前订单延迟队列数量:"+queue.size());
                    System.out.println(queue.toString());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    });
}

ScheduledExecutorService

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private ScheduledExecutorService scheduledExecutor = Executors.newScheduledThreadPool(1);
 
@GetMapping("/testDeferredResult")
@ResponseBody
public DeferredResult<String> test1() {
    DeferredResult<String> deferredResult = new DeferredResult<>();
    scheduledExecutor.schedule(() -> {
        deferredResult.setResult("deferred result");
    }, 10, TimeUnit.SECONDS);
    System.out.println(Thread.currentThread().getName() + "执行结束");
    return deferredResult;
}

其它

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@Scheduled(fixedDelayString = "${time.fixedDelay}")

ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);

@Scheduled(fixedDelay = 5000)
public void scheduleTaskWithFixedDelay() {
    executorService.schedule(new Runnable() {
        @Override
        public void run() {
            // 任务内容
        }
    }, 10, TimeUnit.SECONDS);
}