1 /*

     2  * Copyright (c) 2018, 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.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 8152974

    27  * @key headful

    28  * @modules java.desktop/sun.awt

    29  * @summary AWT hang occurs when sequenced events arrive out of sequence

    30  * @run main SequencedEventTest

    31  */

    32 import sun.awt.AppContext;

    33 import sun.awt.SunToolkit;

    34 

    35 import java.awt.Robot;

    36 import java.awt.Point;

    37 import java.awt.Dimension;

    38 import java.awt.FlowLayout;

    39 import java.awt.AWTEvent;

    40 import java.awt.Toolkit;

    41 import java.awt.event.ActionEvent;

    42 import java.awt.event.ActionListener;

    43 import java.awt.event.InputEvent;

    44 import java.lang.reflect.Constructor;

    45 import java.util.concurrent.CountDownLatch;

    46 

    47 import javax.swing.JFrame;

    48 import javax.swing.JButton;

    49 import javax.swing.SwingUtilities;

    50 import javax.swing.JTextArea;

    51 

    52 public class SequencedEventTest extends JFrame implements ActionListener {

    53     private JButton spamMeButton;

    54     private static Robot robot;

    55     private static SequencedEventTest window;

    56     private static AppContext context;

    57 

    58     public static void main(String[] args) throws Exception {

    59         SwingUtilities.invokeAndWait(() ->  {

    60             window = new SequencedEventTest();

    61             window.setVisible(true);

    62         });

    63 

    64         robot = new Robot();

    65         robot.waitForIdle();

    66 

    67         Point pt  = window.spamMeButton.getLocationOnScreen();

    68         Dimension d = window.spamMeButton.getSize();

    69 

    70         robot.mouseMove(pt.x + d.width / 2, pt.y + d.height / 2);

    71         robot.waitForIdle();

    72         robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);

    73         robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);

    74         /*

    75          *Cannot have robot.waitForIdle() here since it will block the test forever,

    76          * in the case of failure and the test will timeout.

    77          */

    78 

    79         try {

    80             /*

    81              * Wait for 2 seconds, and then see if all the sequenced events are dispatched.

    82              */

    83             Thread.sleep(2000);

    84             AWTEvent ev = Toolkit.getDefaultToolkit().getSystemEventQueue().

    85                     peekEvent(java.awt.event.FocusEvent.FOCUS_LAST + 1);

    86 

    87             if (ev != null)

    88                 throw new RuntimeException("Test case failed, since all the sequenced events" +

    89                 "are not flushed!" + ev);

    90         } catch (InterruptedException e) {

    91             throw new RuntimeException("Test case failed." + e.getMessage());

    92         }

    93 

    94         /*

    95          * In the case of failure, the cleanup job cannot be executed, since it

    96          * will block the test.

    97          */

    98         System.out.println("Test case succeeded.");

    99         context.dispose();

   100         SwingUtilities.invokeAndWait(() -> window.dispose());

   101     }

   102 

   103     public SequencedEventTest() {

   104         super("Test Window");

   105 

   106         setLayout(new FlowLayout());

   107         JTextArea textBlock = new JTextArea("Lorem ipsum dolor sit amet...");

   108         add(textBlock);

   109 

   110         spamMeButton = new JButton("Press me!");

   111         spamMeButton.addActionListener(this);

   112         add(spamMeButton);

   113         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

   114         pack();

   115     }

   116 

   117     @Override

   118     public void actionPerformed(ActionEvent e) {

   119         if(e.getSource() == spamMeButton) {

   120             AWTEvent eventOne = getSequencedEvent();

   121             AWTEvent eventFour = getSequencedEvent();

   122             ThreadGroup tg = new ThreadGroup("TestThreadGroup" );

   123             CountDownLatch latch = new CountDownLatch(1);

   124             Thread t = new Thread(tg, () -> {

   125                 context = SunToolkit.createNewAppContext();

   126                 AWTEvent eventTwo = getSequencedEvent();

   127                 AWTEvent eventThree = getSequencedEvent();

   128 

   129                 Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(eventThree);

   130                 Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(new ActionEvent(this, 0, null));

   131                 Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(new ActionEvent(this, 1, null));

   132                 Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(eventTwo);

   133 

   134                 latch.countDown();

   135             });

   136 

   137             t.start();

   138             try {

   139                 latch.await();

   140             }catch (InterruptedException ex) {

   141                 throw new RuntimeException("Test case failed.");

   142             }

   143 

   144             Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(eventFour);

   145             Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(new ActionEvent(this, 2, null));

   146             Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(new ActionEvent(this, 3, null));

   147             Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(eventOne);

   148 

   149             try {

   150                 t.join();

   151             } catch (InterruptedException ex) {

   152                 throw new RuntimeException("Test case failed.");

   153             }

   154         }

   155     }

   156 

   157     private AWTEvent getSequencedEvent()

   158     {

   159         AWTEvent wrapMe = new AWTEvent(this, AWTEvent.RESERVED_ID_MAX) {};

   160 

   161         try {

   162             /*

   163              * SequencedEvent is a package private class, which cannot be instantiated

   164              * by importing. So use reflection to create an instance.

   165              */

   166             Class<? extends AWTEvent> seqClass = (Class<? extends AWTEvent>) Class.forName("java.awt.SequencedEvent");

   167             Constructor<? extends AWTEvent> seqConst = seqClass.getConstructor(AWTEvent.class);

   168             seqConst.setAccessible(true);

   169             return seqConst.newInstance(wrapMe);

   170         } catch (Throwable err) {

   171             throw new RuntimeException("Unable to instantiate SequencedEvent",err);

   172         }

   173     }

   174 }