/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.tools;

import java.util.concurrent.atomic.AtomicInteger;

import javax.swing.SwingUtilities;

/** Thread that disables GUI components that interfere with
 *  process editing while running.
 * 
 * @author Simon Fischer
 *
 */
public abstract class EditBlockingProgressThread extends ProgressThread {

	private Object lock = new Object();
	private boolean isComplete = false;
	private boolean mustReenable = false;
	private static AtomicInteger pendingThreads = new AtomicInteger(0);
	
	public EditBlockingProgressThread(String i18nKey) {
		super(i18nKey);
	}

	/** Implement this method rather than {@link #run()} to perform the actual task. */
	public abstract void execute();
	
	public final void run() {
		try {
			execute();
		} finally {
			synchronized (lock) {
				lock.notify();
				isComplete = true;
				if ((pendingThreads.decrementAndGet() == 0) && mustReenable) {
					SwingUtilities.invokeLater(new Runnable() {
						@Override
						public void run() {
							SwingTools.setProcessEditorsEnabled(true);
						}
					});
				}	
			}
		}
	}
	
	public void start() {
		super.start();
		// We are on the EDT. BLock GUI a few milliseconds and see if we are complete
		synchronized (lock) {
			pendingThreads.incrementAndGet();
			try {
				lock.wait(200);
			} catch (InterruptedException e) { }
			if (!isComplete) {
				mustReenable = true;				
				SwingTools.setProcessEditorsEnabled(false);
			}
		}
	}
	
	public static boolean isEditing() {
		return pendingThreads.get() > 0;
	}
}