关于CyclicBarrier用法介绍

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package com.lyzx.restdy.callable;

import java.util.Random;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.TimeUnit;


/**
 * CyclicBarrier经典要的用法是
 * 让一部分线程同时开始执行(当然CountDownLatch也能实现类似的功能)
 * 和CountDownLatch相比CyclicBarrier可以重复使用
 * 
 */
public class T6 {
    public static void main(String[] args) {
        
        CyclicBarrier cb = new CyclicBarrier(3);
        
        for(int i=0;i<100;i++){
            new Thread(new O(cb,"one")).start();
            new Thread(new O(cb,"two")).start();
            new Thread(new O(cb,"three")).start();
            System.out.println("=====================================");
            
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            
            System.out.println("##################");
            cb.reset();
            new Thread(new O(cb,"007")).start();
            new Thread(new O(cb,"008")).start();
            new Thread(new O(cb,"009")).start();
        }
    }
}


class O implements Runnable{
    private CyclicBarrier cb;
    private String name;
    
    private Random rand = new Random();
    
    public O(CyclicBarrier cb,String name){
        this.cb=cb;
        this.name=name;
    }
    
    @Override
    public void run(){
        int time = rand.nextInt(2000);
        try{
            TimeUnit.MILLISECONDS.sleep(time);
            System.out.println(this.name+" 准备好了,共睡了("+time+")毫秒");
            cb.await();
            System.out.println("我是["+name+"],我们一起执行任务.......");
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}