Wake.java Source code

Introduction

Here is the source code for Wake.java

Source

import java.util.Vector;

public class Wake {
    private Vector<Object> stopped = new Vector<Object>();

    public void stopOne() {
        Object myLock = new Object();
        synchronized (myLock) {
            stopped.addElement(myLock);
            try {
                myLock.wait();
            } catch (InterruptedException e) {
            }
        }
    }

    public void wakeOne() {
        Object theLock = null;
        synchronized (stopped) {
            if (stopped.size() != 0) {
                theLock = stopped.firstElement();
                stopped.removeElementAt(0);
            }
        }
        if (theLock != null) {
            synchronized (theLock) {
                theLock.notify();
            }
        }
    }

    public static void main(String args[]) {
        Wake queue = new Wake();
        Runnable r = new RunThis(queue);
        Thread t;
        for (int i = 0; i < 10; i++) {
            t = new Thread(r);
            t.start();
        }

        for (int i = 0; i < 11; i++) {
            try {
                Thread.sleep((long) (Math.random() * 1000));
            } catch (InterruptedException e) {
            }
            System.out.println("About to wake one thread");
            queue.wakeOne();
        }
    }
}

class RunThis implements Runnable {
    Wake w;

    public RunThis(Wake w) {
        this.w = w;
    }

    public void run() {
        System.out.println("Thread starting, name is " + Thread.currentThread().getName());
        w.stopOne();
        System.out.println("Thread woken up, name is " + Thread.currentThread().getName());
    }
}