利用DelayQueue实现延时消息队列（简易版MQ）

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1.上文

关于阻塞队列的介绍：http://blog.csdn.net/caicongyang/article/details/50649897

2.需求

延迟消息队列：

1)2个小时后给用户发送短信。
2)15分钟后关闭网络连接。
3)2分钟后再次尝试回调。

3.案例demo

Message.java

package com.ccy.concurrent;import java.util.concurrent.Delayed;import java.util.concurrent.TimeUnit;/** * <p>  * Title: Message.java  * Package com.ccy.concurrent  * </p> * <p> * Description: 延迟执行的消息 * <p> * @author Tom.Cai * @created 2016-2-10 下午7:39:48  * @version V1.0  * */public class Message implements Delayed{private String id;private String name;private long activeTime;//执行时间   public Message(){}public Message(String id, String name,long activeTime) {super();this.id = id;this.name = name;this.activeTime = TimeUnit.NANOSECONDS.convert(activeTime, TimeUnit.MILLISECONDS) + System.nanoTime();}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic int compareTo(Delayed delayed) {Message msg = (Message)delayed;return Integer.valueOf(this.id)>Integer.valueOf(msg.id)?1:( Integer.valueOf(this.id)<Integer.valueOf(msg.id)?-1:0);}@Overridepublic long getDelay(TimeUnit unit) { return unit.convert(this.activeTime - System.nanoTime(), TimeUnit.NANOSECONDS); }}

Producer.javaProducer

package com.ccy.concurrent;import java.util.concurrent.DelayQueue;public class Producer implements Runnable{private DelayQueue<Message> queue;public Producer(DelayQueue<Message> queue){this.queue = queue;}@Overridepublic void run() {//5秒后发送消息Message m2 = new Message("2","Tom",5000);queue.offer(m2);System.out.println("消息生产者往消息队列放置消息："+m2.getId()+":"+m2.getName());//3秒后发送消息Message m1 = new Message("1","Tom",3000);queue.offer(m1);System.out.println("消息生产者往消息队列放置消息："+m1.getId()+":"+m1.getName());}}

Consumer.java

package com.ccy.concurrent;import java.util.concurrent.DelayQueue;public class Consumer implements Runnable{private DelayQueue<Message> queue;public Consumer(DelayQueue<Message> queue){this.queue = queue;}@Overridepublic void run() {while(true){try {Message take = queue.take();System.out.println("消息需求者获取消息："+take.getId()+":"+take.getName());} catch (InterruptedException e) {e.printStackTrace();}}}}

DelayQueueTest.java

package com.ccy.concurrent;import java.util.concurrent.DelayQueue;public class DelayQueueTest {public static void main(String[] args) {DelayQueue<Message> queue = new DelayQueue<Message>();new Thread(new Producer(queue)).start();new Thread(new Consumer(queue)).start();}}

4.效果

5.其他学习资源

http://zhangyp.net/rabbitmq-delayqueue/

...

6.后记

作者将学习Apache的ActiveMQ消息总线，其可以支持定时、延迟投递、重复投递和Cron调度。

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