thread40 - DelayQueue_thread-40-优快云博客

本文链接：https://blog.youkuaiyun.com/mediocre117/article/details/73330897

本文介绍了一个使用Java并发包中的DelayQueue实现的任务调度示例。通过自定义任务类并实现Delayed接口，可以将任务加入DelayQueue，并按设定的时间延迟顺序执行。示例展示了如何创建带有不同延迟时间的任务并将其放入队列中，以及如何从队列中取出并按时间顺序执行这些任务。

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package com.neutron.t22;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;

/**
 *  Queue
 *      DelayQueue  无界队列，什么时候内存填满，就结束
 *      可以做定时执行任务，在添加到DelayQueue队列中会按照执行前后顺序去执行任务
 *  使用put添加到DelayQueue,获取数据时按照特定条件的前后顺序来获取，例子中根据时间先后顺序获取
 */
public class T227DelayQueue {

    static BlockingQueue<MyTask> queue = new DelayQueue();

    static class MyTask implements Delayed {
        long runningTime;

        MyTask (long runningTime) {
            this.runningTime = runningTime;
        }

        @Override
        public long getDelay(TimeUnit unit) {
            return unit.convert(runningTime - System.currentTimeMillis(), TimeUnit.MILLISECONDS);
        }

        @Override
        public int compareTo(Delayed o) {
            if (this.getDelay(TimeUnit.MILLISECONDS) < o.getDelay(TimeUnit.MILLISECONDS)) {
                return -1;
            } else if (this.getDelay(TimeUnit.MILLISECONDS) > o.getDelay(TimeUnit.MILLISECONDS)) {
                return 1;
            } else {
                return 0;
            }
        }

        @Override
        public String toString() {
            return this.runningTime+ "";
        }
    }

    /*
         [1497592892838, 1497592893338, 1497592893838, 1497592894838, 1497592894338]
          1497592892838
          1497592893338
          1497592893838
          1497592894338
          1497592894838
     */
    public static void main(String[] args) throws InterruptedException {
        long now = System.currentTimeMillis();
        MyTask task1 = new MyTask(now + 1000);
        MyTask task2 = new MyTask(now + 2000);
        MyTask task3 = new MyTask(now + 1500);
        MyTask task4 = new MyTask(now + 2500);
        MyTask task5 = new MyTask(now + 500);

        queue.put(task1);
        queue.put(task2);
        queue.put(task3);
        queue.put(task4);
        queue.put(task5);

        System.out.println(queue);

        for (int i = 0; i < 5; i++) {
            System.out.println(queue.take());
        }
    }

}