多线程 主线程调用多个子线程

本文探讨了并发编程的基本概念,并详细介绍了如何使用Java的ThreadPoolExecutor创建线程池,以及通过自定义Worker类实现任务调度和同步。通过实例演示了如何在多线程环境中高效执行任务并确保线程安全。

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package com.tristan;

import java.util.Random;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

import com.google.common.util.concurrent.ThreadFactoryBuilder;

/**
* http://dongxuan.iteye.com/blog/901689
* http://dongxuan.iteye.com/blog/902571
* @author Administrator
*
*/
public class TestMultiThread {

private static ThreadPoolExecutor threadPoolExecutor;

static{
threadPoolExecutor = new ThreadPoolExecutor(2, 4, 1, TimeUnit.MINUTES,
new ArrayBlockingQueue<Runnable>(2),
new ThreadFactoryBuilder().setDaemon(true).setNameFormat("ExecuteEngine-%s").build());
}

public static void main(String[] args) throws Exception{

final AtomicLong ai = new AtomicLong(0);

int num = 4;
for (int i = 0; i < num; i++) {
Worker worker = new Worker(ai);
threadPoolExecutor.execute(worker);
}

while(true){
synchronized (ai) {
if(ai.get() == num){
break;
}else{
ai.wait(1000);
}
}
}


System.out.println("end " + ai.get());

}


static class Worker implements Runnable{

AtomicLong ai;

public Worker(AtomicLong ai) {
this.ai = ai;
}

@Override
public void run() {
Random r = new Random();
try {
long time = 1000 + r.nextInt(10*1000);
System.out.println(Thread.currentThread().getName() + " "+time);
Thread.sleep(time);
} catch (InterruptedException e) {
e.printStackTrace();
}
ai.incrementAndGet();

synchronized (ai) {
ai.notify();
}
}
}
}

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