CyclicBarrier的用法

多个线程在指定的集合点(屏障点)等待集合后在继续去下一个集合点

import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class CyclicBarrierTest {

    public static void main(String[] args) {
        ExecutorService service = Executors.newCachedThreadPool();
        final  CyclicBarrier cb = new CyclicBarrier(3);//设置等待到达的线程数目
        Runnable runnable = new Runnable(){
            public void run(){
            try {
                Thread.sleep((long)(Math.random()*10000));    
                System.out.println("线程" + Thread.currentThread().getName() + 
                        "即将到达集合地点1，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，"+(cb.getNumberWaiting()==2?"都到齐了继续走呀":"正在等候"));                        
                cb.await();//到此如果没有达到公共屏障点，则该线程处于等待状态，如果达到公共屏障点则所有处于等待的线程都继续往下运行
                
                Thread.sleep((long)(Math.random()*10000));    
                System.out.println("线程" + Thread.currentThread().getName() + 
                        "即将到达集合地点2，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，"+(cb.getNumberWaiting()==2?"都到齐了继续走呀":"正在等候"));                  
                cb.await();    
                Thread.sleep((long)(Math.random()*10000));    
                System.out.println("线程" + Thread.currentThread().getName() + 
                        "即将到达集合地点3，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，"+(cb.getNumberWaiting()==2?"都到齐了继续走呀":"正在等候"));                  
                cb.await();                        
            } catch (Exception e) {
                e.printStackTrace();
            }                
        }
    };
        for(int i=0;i<3;i++){        
            service.execute(runnable);
        }
        service.shutdown();
    }
}