Java并发:线程间数据传递和交换

2021-05-19 03:30

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标签:cat   rom   运行   中断   实现   []   color   hang   引用   

一、通过SynchronousQueue方式实现线程间数据传递:

  线程A与线程B共同持有一个SynchronousQueue的引用,线程B调用take方法,阻塞以等待; 线程A运行后计算出结果,将结果put到queue中;

public class SynchronousQueueTest {
    public static void main(String[] args) throws InterruptedException {

        SynchronousQueue queue = new SynchronousQueue();
        //线程A putThread
        Thread putThread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("put thread start");
                try {
                    Thread.sleep(3000);
                    System.out.println("put thread put对象");
                    queue.put(1);
                } catch (InterruptedException e) {
                }
                System.out.println("put thread end");
            }
        });
        //线程B takeThread
        Thread takeThread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("take thread start");
                try {
                    System.out.println("take thread 等待put对象");
                    System.out.println("take from putThread: " + queue.take());
                } catch (InterruptedException e) {
                }
                System.out.println("take thread end");
            }
        });

        putThread.start();
        takeThread.start();
    }
}

 二、线程Exchanger工具类实现线程间的数据交换:

  当一个线程到达exchange调用点时,如果它的伙伴线程此前已经调用了此方法,那么它的伙伴会被调度唤醒并与之进行对象交换,然后各自返回。如果它的伙伴还没到达交换点,那么当前线程将会被挂起,直至伙伴线程到达——完成交换正常返回;或者当前线程被中断——抛出中断异常;又或者是等候超时——抛出超时异常。

public class ExchangerTest {

    public static void main(String[] args) {
        ExecutorService service = Executors.newCachedThreadPool();
        final Exchanger exchanger = new Exchanger();
        service.execute(new Runnable(){
            public void run() {
                try {                
                    String data1 = "thread-1-data";
                    System.out.println("线程" + Thread.currentThread().getName() +"正在把数据" + data1 +"换出去");
                    Thread.sleep((long)(Math.random()*10000));
                    String data2 = (String)exchanger.exchange(data1);
                    System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为" + data2);
                }catch(Exception e){
                    
                }
            }    
        });
        service.execute(new Runnable(){
            public void run() {
                try {                
                    String data1 = "thread-2-data";
                    System.out.println("线程" + Thread.currentThread().getName() + "正在把数据" + data1 +"换出去");
                    Thread.sleep((long)(Math.random()*10000));                    
                    String data2 = (String)exchanger.exchange(data1);
                    System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为" + data2);
                }catch(Exception e){
                    
                }                
            }    
        });        
    }
}

 

Java并发:线程间数据传递和交换

标签:cat   rom   运行   中断   实现   []   color   hang   引用   

原文地址:https://www.cnblogs.com/java-zzl/p/9741288.html


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