package com.wkcto.threadpool;

import java.util.Random;
import java.util.concurrent.*;

/**
 * 自定義線程工廠
 */
public class Test04 {
    public static void main(String[] args) throws InterruptedException {
        //定義任務
        Runnable r = new Runnable() {
            @Override
            public void run() {
                int num = new Random().nextInt(10);
                System.out.println(Thread.currentThread().getId() + "--" + System.currentTimeMillis() + "開始睡眠:" + num + "秒");
                try {
                    TimeUnit.SECONDS.sleep(num);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        //創建線程池, 使用自定義線程工廠, 采用默認的拒絕策略是拋出異常
        ExecutorService executorService = new ThreadPoolExecutor(5, 5, 0, TimeUnit.SECONDS, new SynchronousQueue<>(), new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                //根據參數r接收的任務,創建一個線程
                Thread t = new Thread( r );
                t.setDaemon(true);  //設置為守護線程, 當主線程運行結束,線程池中的線程會自動退出
                System.out.println("創建了線程: " + t);
                return t ;
            }
        });

        //提交5個任務, 當給當前線程池提交的任務超過5個時,線程池默認拋出異常
        for (int i = 0; i < 5; i++) {
            executorService.submit(r);
        }

        //主線程睡眠
        Thread.sleep(10000);
        //主線程睡眠超時, 主線程結束, 線程池中的線程會自動退出
    }
}