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/**
 * Copyright (c) 2004 - 2010 Eike Stepper (Berlin, Germany) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Eike Stepper - initial API and implementation
 */
package org.eclipse.net4j.util.concurrent;

import java.util.Timer;
import java.util.TimerTask;

/**
 * @author Eike Stepper
 * @since 2.0
 */
public abstract class Timeouter
{
  private Timer timer;

  private long timeout;

  private TimerTask timeoutTask;

  private long touched;

  public Timeouter(Timer timer, long timeout)
  {
    this.timer = timer;
    this.timeout = timeout;
    touched = System.currentTimeMillis();
    scheduleTimeout();
  }

  public Timer getTimer()
  {
    return timer;
  }

  public long getTimeout()
  {
    return timeout;
  }

  public void setTimeout(long timeout)
  {
    this.timeout = timeout;
  }

  public void touch()
  {
    touched = System.currentTimeMillis();
  }

  public void dispose()
  {
    if (timeoutTask != null)
    {
      TimerTask task = timeoutTask;
      timeoutTask = null;
      task.cancel();
    }
  }

  protected boolean isDisposed()
  {
    return timeoutTask == null;
  }

  protected abstract void handleTimeout(long untouched);

  private void scheduleTimeout()
  {
    timeoutTask = new TimerTask()
    {
      @Override
      public void run()
      {
        if (!isDisposed())
        {
          long untouched = System.currentTimeMillis() - touched;
          if (untouched > timeout)
          {
            timeoutTask = null;
            handleTimeout(untouched);
          }
          else
          {
            scheduleTimeout();
          }
        }
      }
    };

    long delay = Math.max(timeout - (System.currentTimeMillis() - touched), 0L);
    timer.schedule(timeoutTask, delay);
  }
}