DelayQueue

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package concurrentTest;import java.util.concurrent.DelayQueue;import java.util.concurrent.Delayed;import java.util.concurrent.TimeUnit;/** * Created by mashao on 15/9/23. */public class TestDelayQueue {    static class Element implements Delayed {        private long trigger;        private int id;        public long getTrigger() {            return this.trigger;        }        public int getId() {            return this.id;        }        Element(long i, int id) {            trigger = System.currentTimeMillis() + i;            this.id = id;        }        public long getDelay(TimeUnit unit) {            return trigger - System.currentTimeMillis();        }        public int compareTo(Delayed o) {            return (int)(this.getDelay(TimeUnit.MILLISECONDS) - o.getDelay(TimeUnit.MILLISECONDS));        }    }    public static void main(String[] args) {        DelayQueue<Element> queue = new DelayQueue<Element>();        queue.add(new Element(1000L, 1));        queue.add(new Element(500L, 2));        long start = System.currentTimeMillis();        while (!queue.isEmpty()) {            try {                Element element = queue.take();                long period = System.currentTimeMillis() - start;                System.out.println(period + ":" + element.getId());            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}
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