java concurrent Exchanger的例子

最新推荐文章于 2025-11-24 16:00:00 发布

原创最新推荐文章于 2025-11-24 16:00:00 发布 · 1.9k 阅读

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本文介绍了一个使用Java实现的简单同步缓冲区填充与清空的案例。该案例通过两个线程交替进行数据的填充与清空操作，演示了如何利用Exchanger协调两个线程之间的数据交换过程。缓冲区具有固定的容量限制，并且提供了同步的方法来确保线程安全。

class DataBuffer { private int count; public static int MAX_SIZE = 100; public DataBuffer(int count) { this.count = count; } public synchronized boolean isFull() { return count == MAX_SIZE; } public synchronized boolean isEmpty() { return count == 0; } public void add(int offset) { count += offset; } public void sub(int offset) { count -= offset; } public int size() { return count; } } public class FillAndEmpty { private Exchanger<DataBuffer> exchanger = new Exchanger<DataBuffer>(); private DataBuffer initialEmptyBuffer = new DataBuffer(0); private DataBuffer initialFullBuffer = new DataBuffer(DataBuffer.MAX_SIZE); private static final int step = 2; private void addToBuffer(DataBuffer dataBuffer) { dataBuffer.add(step); } private void takeFromBuffer(DataBuffer dataBuffer) { dataBuffer.sub(step); } class FillingLoop implements Runnable { public void run() { DataBuffer currentBuffer = initialEmptyBuffer; try { while (currentBuffer != null) { addToBuffer(currentBuffer); if (currentBuffer.isFull()) { currentBuffer = exchanger.exchange(currentBuffer); System.out.println(currentBuffer + "/t" + "currentBuffer.isFull()"); } } } catch (InterruptedException ex) { Thread.currentThread().interrupt(); } } } class EmptyingLoop implements Runnable { public void run() { DataBuffer currentBuffer = initialFullBuffer; try { while (currentBuffer != null) { takeFromBuffer(currentBuffer); if (currentBuffer.isEmpty()) { Thread.sleep(5000); currentBuffer = exchanger.exchange(currentBuffer); System.out.println(currentBuffer + "/t" + "currentBuffer.isEmpty()"); } } } catch (InterruptedException ex) { Thread.currentThread().interrupt(); } } } void start() { new Thread(new FillingLoop()).start(); new Thread(new EmptyingLoop()).start(); } public static void main(String[] args) { new FillAndEmpty().start(); } }