manager.java

一个用于排队系统仿真的开源软件,有非常形象的图象仿真过程!

/**
 * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package jmt.gui.common;

import java.awt.*;
import java.util.Vector;

/**
 * <p>Title: Manager</p>
 * <p>Description: This class is used to kill the entire JVM when all applications are
 * terminated. On normal working conditions this is not needed, but some racing issues
 * exists that can cause untermination problems.</p>
 *
 * @author Bertoli Marco
 *         Date: 19-giu-2006
 *         Time: 14.46.35
 */
public class Manager {
    protected static Vector windows = new Vector();

    /**
     * Adds a new Window to be checked for termination before terminating JVM
     * @param application JMT application to be checked
     */
    public static void addJMTWindow(Window application) {
        if (!windows.contains(application))
            windows.add(application);
    }

    /**
     * This method has to be called each time a JMT application is terminated. If all applications
     * are terminated, JVM is killed.
     * @param application application to be terminated. If application was not disposed,
     * this method will do 'dispose()' too.
     */
    public static void exit(Window application) {
        // Disposes application window if user didn't do it.
        if (application.isDisplayable())
            application.dispose();
        windows.remove(application);
        if (windows.isEmpty())
            System.exit(0); // Closes current JVM with no error code.
    }
}