Exchanger兄弟线程间数据信息交换

一、简述

　　Exchanger可以在两个线程之间交换数据，只能是2个线程，他不支持更多的线程之间互换数据。当线程A调用Exchange对象的exchange()方法后，他会陷入阻塞状态，直到线程B也调用了exchange()方法，然后以线程安全的方式交换数据，之后线程A和B继续运行。

二、代码示例

 public class ExchangerTest {

     public static void main(String[] args) {
         Exchanger<String> exchanger = new Exchanger<>();
         ExecutorService executorService = Executors.newFixedThreadPool(2);
         String data = "";
         executorService.execute(new Procuder(data, exchanger));
         executorService.execute(new Consumer(data, exchanger));
     }

 }

 class Procuder implements Runnable{

     private String data;
     private Exchanger<String> exchanger;
     public Procuder(String data,Exchanger<String> exchanger) {
         this.data = data;
         this.exchanger = exchanger;
     }

     @Override
     public void run() {

         try {
             for (int i = 0; i < 5; i++) {
                 data = new Random().nextInt(1000)+"";
                 System.out.println("producer"+i+" "+data);
                 Thread.sleep(new Random().nextInt(5)*1000);
                 exchanger.exchange(data);
             }
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
     }

 }

 class Consumer implements Runnable{

     private String data;
     private Exchanger<String> exchanger;
     public Consumer(String data,Exchanger<String> exchanger) {
         this.data = data;
         this.exchanger = exchanger;
     }

     @Override
     public void run() {

         try {
             for (int i = 0; i < 5; i++) {
                 data = exchanger.exchange(data);
                 Thread.sleep(new Random().nextInt(5)*1000);
                 System.out.println("Consumer"+i+" "+data);
             }
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
     }

 }

producer0 360
producer1 782
Consumer0 360
producer2 503
Consumer1 782
producer3 367
Consumer2 503
producer4 151
Consumer3 367
Consumer4 151