package concurrency;

import java.awt.*;
import java.applet.*;
import concurrency.display.*;

public class CountDown extends Applet
                       implements Runnable {
  Thread counter; int i;
  final static int N = 10;
  AudioClip beepSound, tickSound;
  NumberCanvas display;

  public void init() {
    add(display=new NumberCanvas("CountDown"));
    display.setSize(150,100);
    tickSound =
      getAudioClip(getDocumentBase(),"sound/tick.au");
    beepSound =
 	  getAudioClip(getDocumentBase(),"sound/beep.au");
  }

  public void start() {
    counter = new Thread(this);
    i = N; counter.start();
  }

  public void stop() {
    counter = null;
  }

  public void run() {
    while(true) {
      if (counter == null) return;
      if (i>0)  { tick(); --i; }
      if (i==0) { beep(); return;}
    }
  }

  private void tick(){
    display.setvalue(i); tickSound.play();
    try{ Thread.sleep(1000);}
    catch (InterruptedException e){}
  }

  private void beep(){
    display.setvalue(i); beepSound.play();
  }
}