Java example source code file (MemoryLeakTest.java)

This example Java source code file (MemoryLeakTest.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.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, button, event, examine, exception, execute, fail, graphics, image, leak, memoryleaktest, pass, ppid\'\\n, test, testdialog, textarea

The MemoryLeakTest.java Java example source code

/*
 * Copyright (c) 1998, 2008, 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 4078566 6658398
   @summary Test for a memory leak in Image.
   @run main/manual MemoryLeakTest
*/

import java.applet.Applet;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;

class Globals {
  static boolean testPassed=false;
  static Thread mainThread=null;
}

public class MemoryLeakTest extends Applet {

public static void main(String args[]) throws Exception {
  new TestDialog(new Frame(), "MemoryLeakTest").start();
  new MemoryLeak().start();
  Globals.mainThread = Thread.currentThread();
  try {
    Thread.sleep(300000);
  } catch (InterruptedException e) {
    if (!Globals.testPassed)
      throw new Exception("MemoryLeakTest failed.");
  }
}

}

class TestDialog extends Dialog
    implements ActionListener {

TextArea output;
Button passButton;
Button failButton;
String name;

public TestDialog(Frame frame, String name)
{
  super(frame, name + " Pass/Fail Dialog");
  this.name = name;
  output = new TextArea(11, 50);
  add("North", output);
  output.append("Do the following steps on Solaris only.\n");
  output.append("Maximize and minimize the Memory Leak Test window.\n");
  output.append("Execute the following after minimize.\n");
  output.append("    ps -al | egrep -i 'java|PPID'\n");
  output.append("Examine the size of the process under SZ.\n");
  output.append("Maximize and minimize the Memory Leak Test window again.\n");
  output.append("Execute the following after minimize.\n");
  output.append("    ps -al | egrep -i 'java|PPID'\n");
  output.append("Examine the size of the process under SZ.\n");
  output.append("If the two SZ values are the same, plus or minus one,\n");
  output.append("then click Pass, else click Fail.");
  Panel buttonPanel = new Panel();
  passButton = new Button("Pass");
  failButton = new Button("Fail");
  passButton.addActionListener(this);
  failButton.addActionListener(this);
  buttonPanel.add(passButton);
  buttonPanel.add(failButton);
  add("South", buttonPanel);
  pack();
}

public void start()
{
  show();
}

public void actionPerformed(ActionEvent event)
{
    if ( event.getSource() == passButton ) {
      Globals.testPassed = true;
      System.err.println(name + " Passed.");
    }
    else if ( event.getSource() == failButton ) {
      Globals.testPassed = false;
      System.err.println(name + " Failed.");
    }
    this.dispose();
    if (Globals.mainThread != null)
      Globals.mainThread.interrupt();
}

}


class MemoryLeak extends Frame implements ComponentListener
{
private Image osImage;

public MemoryLeak()
{
    super("Memory Leak Test");
    setSize(200, 200);
    addComponentListener(this);
}

public static void main(String args[])
{
   new MemoryLeak().start();
}

public void start()
{
  show();
}

public void paint(Graphics g) {
    if (osImage != null) {
        g.drawImage(osImage, 0, 0, this);
    }
}

public void update(Graphics g)
{
    paint(g);
}

public void componentResized(ComponentEvent e)
{
    Image oldimage = osImage;
    osImage = createImage(getSize().width, getSize().height);
    Graphics g = osImage.getGraphics();
    if (oldimage != null) {
        g.drawImage(oldimage, 0, 0, getSize().width, getSize().height, this);
        oldimage.flush();
    } else {
        g.setColor(Color.blue);
        g.drawLine(0, 0, getSize().width, getSize().height);
    }
    g.dispose();
}

public void componentMoved(ComponentEvent e) {}

public void componentShown(ComponentEvent e)
{
    osImage = createImage(getSize().width, getSize().height);
    Graphics g = osImage.getGraphics();
    g.setColor(Color.blue);
    g.drawLine(0, 0, getSize().width, getSize().height);
    g.dispose();
}

public void componentHidden(ComponentEvent e) {}

}