6.多线程学习--守护线程的创建和运行

package com.jackson.deng.concurrent.chapter1.six;import java.util.ArrayDeque;import java.util.Date;import java.util.Deque;import java.util.concurrent.TimeUnit;/** * title : 守护线程的创建和运行 * desc : 模拟一个写任务进程和清除任务进程(守护线程,也是后台线程) * process desc: * 3个写任务进程负责到每隔1秒向双向队列deque的添加数据最前面 *  清理进程从开始运行的当前时间-写进程写到deque的进程时间>10秒,就把deque从后面进行移除 * @author jackson * */public class DaemonCreateAndRunnable {/** * 写任务进程 */public class WriterTask implements Runnable {//双向队列private Deque<Event> deque;public WriterTask(Deque<Event> deque) {this.deque = deque;}@Overridepublic void run() {for (int i = 0; i < 100; i++) {Event event = new Event();event.setDate(new Date(System.currentTimeMillis()));event.setEvent("The thread " + Thread.currentThread().getId() + "generator a event;");deque.addFirst(event);try {TimeUnit.SECONDS.sleep(1);} catch (Exception e) {e.printStackTrace();}}}}public class CleanerTask extends Thread {private Deque<Event> deque;public CleanerTask(Deque<Event> deque) {this.deque = deque;setDaemon(true);//设置CleanerTask为守护线程}@Overridepublic void run() {while (true) {Date date = new Date(System.currentTimeMillis());clean(date);}}/** * 守护线程cleaner运行后的10秒移除新增加到deque中的event */private void clean(Date date) {if (deque.size() <= 0) {return;}long difference = 0l;boolean delete = false;while (true) {Event e = deque.getLast();difference = date.getTime() - e.getDate().getTime();if (difference > 10000) {System.out.println("Cleaner : " + e.getEvent());deque.removeLast();delete = true;} else {break;}}if (delete) {System.out.println("Deque : size of the thread is " + deque.size());}}}public static void main(String[] args) {DaemonCreateAndRunnable dcr = new DaemonCreateAndRunnable();Deque<Event> deque = new ArrayDeque<Event>();for (int i = 0; i < 3; i++) {Thread t = new Thread(dcr.new WriterTask(deque));t.start();}Thread clean = dcr.new CleanerTask(deque);clean.start();}}class Event {private Date date;private String event;public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}public String getEvent() {return event;}public void setEvent(String event) {this.event = event;}}

运行结果:

Cleaner : The thread 9generator a event;
Cleaner : The thread 10generator a event;
Deque : size of the thread is 27
Cleaner : The thread 8generator a event;
Cleaner : The thread 10generator a event;
Cleaner : The thread 9generator a event;
Deque : size of the thread is 27
Cleaner : The thread 10generator a event;
Cleaner : The thread 9generator a event;
Cleaner : The thread 8generator a event;
Deque : size of the thread is 27
Cleaner : The thread 8generator a event;
Cleaner : The thread 10generator a event;
Cleaner : The thread 9generator a event;
Deque : size of the thread is 27
Cleaner : The thread 9generator a event;
Cleaner : The thread 10generator a event;
Cleaner : The thread 8generator a event;
Deque : size of the thread is 27
Cleaner : The thread 9generator a event;
Cleaner : The thread 10generator a event;
Cleaner : The thread 8generator a event;
Deque : size of the thread is 27
Cleaner : The thread 9generator a event;
Deque : size of the thread is 29
Cleaner : The thread 10generator a event;
Cleaner : The thread 8generator a event;
Deque : size of the thread is 27
Cleaner : The thread 8generator a event;
Cleaner : The thread 10generator a event;
Cleaner : The thread 9generator a event;
Deque : size of the thread is 27
Cleaner : The thread 8generator a event;
Deque : size of the thread is 29
Cleaner : The thread 9generator a event;
Deque : size of the thread is 30
Cleaner : The thread 10generator a event;
Deque : size of the thread is 29