/**
 * AlarmBean.java  1.00 97/07/09 Merlin Hughes
 *
 * Copyright (c) 1997 Merlin Hughes, All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * for commercial and non-commercial purposes and without fee is
 * hereby granted provided that this copyright notice appears in
 * all copies.
 *
 * http://prominence.com/                         ego@merlin.org
 */

package org.merlin.beans.alarm;

import java.io.*;
import java.util.*;

public class AlarmBean implements Runnable, Serializable {
  protected int timeout = 1000;

  public AlarmBean () {
  }
  
  public void setTimeout (int t) {
    timeout = t;
  }

  public int getTimeout () {
    return timeout;
  }

  transient protected Thread alarm;

  public synchronized void start () {
    if (alarm == null) {
      alarm = new Thread (this);
      alarm.start ();
    }
  }

  public synchronized void stop () {
    Thread t = alarm;
    if (t != null) {
      t.stop ();
      alarm = null;
    }
  }

  public void run () {
    try {
      Thread.sleep (timeout);
      alarm = null;
      dispatchAlarmCall ();
    } catch (InterruptedException ex) {
    }
  }

  protected Vector listeners = new Vector ();

  public void addAlarmListener (AlarmListener listener) {
    listeners.addElement (listener);
  }

  public void removeAlarmListener (AlarmListener listener) {
    listeners.removeElement (listener);
  }

  protected void dispatchAlarmCall () {
    AlarmEvent event = new AlarmEvent (this);
    Vector listeners = (Vector) this.listeners.clone ();
    
    for (int i = 0; i < listeners.size (); ++ i)
      ((AlarmListener) listeners.elementAt (i)).alarmCalled (event);
  }
}