1 /*
   2  * Copyright (c) 2013, 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 sun.awt;
  27 
  28 import java.awt.*;
  29 
  30 /**
  31  * An interface for the EventQueue delegate.
  32  * This class is added to support JavaFX/AWT interop single threaded mode
  33  * The delegate should be set in EventQueue by {@link EventQueue#setFwDispatcher(FwDispatcher)}
  34  * If the delegate is not null, than it handles supported methods instead of the
  35  * event queue. If it is null than the behaviour of an event queue does not change.
  36  *
  37  * @see EventQueue
  38  *
  39  * @author Petr Pchelko
  40  *
  41  * @since 1.8
  42  */
  43 public interface FwDispatcher {
  44     /**
  45      * Delegates the {@link EventQueue#isDispatchThread()} method
  46      */
  47     boolean isDispatchThread();
  48 
  49     /**
  50      * Forwards a runnable to the delegate, which executes it on an appropriate thread.
  51      * @param r - a runnable calling {@link EventQueue#dispatchEventImpl(java.awt.AWTEvent, Object)}
  52      */
  53     void scheduleDispatch(Runnable r);
  54 
  55     /**
  56      * Delegates the {@link java.awt.EventQueue#createSecondaryLoop()} method
  57      */
  58     SecondaryLoop createSecondaryLoop();
  59 }