Java example source code file (WPanelPeerPerf.java)

This example Java source code file (WPanelPeerPerf.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

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Java - Java tags/keywords

awt, borderlayout, button, counter, event, frame, gui, interruptedexception, iterations_per_screen, label, max_wait_per_screen, nested_panels, object, panel, point, runtimeexception, swing, wpanelpeerperf

The WPanelPeerPerf.java Java example source code

/*
 * Copyright (c) 2004, 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 @test
 @bug 5085626
 @summary Exponential performance regression in AWT components (multiple mon)
 @run main WPanelPeerPerf
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * This test must be run on a multi-screen system.
 * This test works by moving a Frame back and forth between the screens a few
 * times.  When the bug is active, the first move will overwhelm the EDT with
 * recursive display change calls.  The test fails if it takes too long to
 * service the setLocation() calls and send componentMoved() events.
 */
public class WPanelPeerPerf {

    private static final int NESTED_PANELS = 25;
    private static final int ITERATIONS_PER_SCREEN = 3;
    private static final int MAX_WAIT_PER_SCREEN = 2500;
    private static final int PAUSE_BETWEEN_MOVES = 500;


    private static Object showLock = new Object();

    private static Counter instance = null;
    public static Counter getCounter() {
        if (instance == null) {
            instance = new Counter();
        }
        return instance;
    }

    private static class Counter {
        int counter;
        Counter() { counter = 0; }
    }

    // This one is very slow!
    public static void testAWT() {
        // fail if only on one screen
        int numScreens = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices().length;
        if (numScreens < 2) {
            System.err.println("Test must be run on a multiscreen system");
            return;
        }
        final Frame frame = new Frame("AWT WPanelPeerPerf");
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent ev) {
                System.exit(0);
            }
            public void windowOpened(WindowEvent e) {
                synchronized(showLock) {
                    showLock.notify();
                }
            }
        });
        frame.setLayout(new BorderLayout());
        Label label = new Label("Hello world");
        frame.add(label, BorderLayout.NORTH);
        Panel panel = new Panel(new BorderLayout());
        Panel currentPanel = panel;
        for (int i = 0; i < NESTED_PANELS; i++) {
            Panel newPanel = new Panel(new BorderLayout());
            currentPanel.add(newPanel, BorderLayout.CENTER);
            currentPanel = newPanel;
        }
        currentPanel.add(new Label("WPanelPeerPerf"));
        frame.add(panel, BorderLayout.CENTER);
        Button btn = new Button("OK");
        frame.add(btn, BorderLayout.SOUTH);
        frame.pack();

        frame.addComponentListener(new ComponentAdapter() {
            public void componentMoved(ComponentEvent e) {
                System.out.println("Frame moved: ");
                Counter ctr = getCounter();
                synchronized(ctr) {
                    ctr.counter++;
                    ctr.notify();
                }
            }
        });
        synchronized(showLock) {
            try {
                frame.setVisible(true);
                showLock.wait();
            }
            catch (InterruptedException e) {
                e.printStackTrace();
                throw new RuntimeException("Problem with showLock");
            }
        }
        runTest(frame);
    }

    public static void runTest(Frame theFrame) {
        System.out.println("Running test");
        GraphicsDevice[] devs = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices();
        Point[] points = new Point[devs.length];

        for (int i = 0; i < points.length; i++) {
            Rectangle bounds = devs[i].getDefaultConfiguration().getBounds();
            points[i] = new Point(bounds.x + (bounds.width / 2),
                    bounds.y + (bounds.height / 2));
            System.out.println("Added point:" + points[i]);
        }

        final Frame localFrame = theFrame;

        for (int n = 0; n < ITERATIONS_PER_SCREEN; n++) {
            for (int i = 0; i < points.length; i++) {
                final Point contextPoint = points[i];
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        localFrame.setLocation(contextPoint);
                    }
                });
                try {
                    Thread.sleep(PAUSE_BETWEEN_MOVES);
                }
                catch (InterruptedException e) {
                    System.out.println("Interrupted during iteration");
                }
            }
        }
        Counter ctr = getCounter();
        synchronized(ctr) {
            try {
                if (ctr.counter < ITERATIONS_PER_SCREEN * devs.length) {
                    // If test hasn't finished, wait for maximum time
                    // If we get interrupted, test fails
                    ctr.wait((long)(ITERATIONS_PER_SCREEN * MAX_WAIT_PER_SCREEN * devs.length));
                    System.out.println("after wait");
                    if (ctr.counter < ITERATIONS_PER_SCREEN * devs.length) {
                        throw new RuntimeException("Waited too long for all the componentMoved()s");
                    }
                }
            }
            catch(InterruptedException e) {
                e.printStackTrace();
                throw new RuntimeException("Wait interrupted - ???");
            }
            System.out.println("Counter reads: " + ctr.counter);
        }

    }
    public static void main(String[] args) {
        testAWT();
    }
}