1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.awt.desktop;
  27 
  28 import java.awt.AppEvent.QuitEvent;
  29 
  30 /**
  31  * An implementor determines if requests to quit this application should proceed or cancel.
  32  *
  33  * @see java.awt.Desktop#setQuitHandler(java.awt.desktop.QuitHandler)
  34  * @see java.awt.Desktop#setQuitStrategy(java.awt.desktop.QuitStrategy)
  35  */
  36 public interface QuitHandler {
  37     /**
  38      * Invoked when the application is asked to quit.
  39      *
  40      * Implementors must call either {@link QuitResponse#cancelQuit()}, {@link QuitResponse#performQuit()}, or ensure the application terminates.
  41      * The process (or log-out) requesting this app to quit will be blocked until the {@link QuitResponse} is handled.
  42      * Apps that require complex UI to shutdown may call the {@link QuitResponse} from any thread.
  43      * Your app may be asked to quit multiple times before you have responded to the initial request.
  44      * This handler is called each time a quit is requested, and the same {@link QuitResponse} object is passed until it is handled.
  45      * Once used, the {@link QuitResponse} cannot be used again to change the decision.
  46      *
  47      * @param e the request to quit this application.
  48      * @param response the one-shot response object used to cancel or proceed with the quit action.
  49      */
  50     public void handleQuitRequestWith(final QuitEvent e, final QuitResponse response);
  51 }