Java example source code file (ReadingInterruptionTest.java)

This example Java source code file (ReadingInterruptionTest.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

abortaction, action, awt, bufferedimage, disposeaction, failed, geometry, illegalstateexception, image, imageio, imagereader, jpeg, radialgradientpaint, readinginterruptiontest, resetaction, runtimeexception, test, throwable

The ReadingInterruptionTest.java Java example source code

/*
 * Copyright (c) 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     6557086 6547241
 * @summary Test verifies that invocation of reset/abort/dispose methods from
 *          another thread does not cause crash in jpeg library.
 * @run     main ReadingInterruptionTest
 */

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RadialGradientPaint;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.event.IIOReadProgressListener;
import javax.imageio.stream.ImageInputStream;


public class ReadingInterruptionTest implements IIOReadProgressListener {

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

        System.out.println("Test abort()....");
        ReadingInterruptionTest t = new ReadingInterruptionTest(new AbortAction());
        t.doTest();

        System.out.println("Test reset()....");
        t = new ReadingInterruptionTest(new ResetAction());
        t.doTest();

        System.out.println("Test dispose()....");
        t = new ReadingInterruptionTest(new DisposeAction());
        t.doTest();
     }

    protected abstract static class Action implements Runnable {
        protected ImageReader target;

        public void setTarget(ImageReader target) {
            this.target = target;
        }

        public abstract void run();
    }

    protected static class DisposeAction extends Action {
        public void run() {
            try {
                target.dispose();
            } catch (IllegalStateException e) {
                System.out.println("Test PASSED: IllegalStateException was thrown.");
            } catch (Throwable e) {
                throw new RuntimeException("Test FAILED.", e);
            }
        }
    }

    protected static class AbortAction extends Action {
        public void run() {
            try {
                target.abort();
            } catch (IllegalStateException e) {
                System.out.println("Test PASSED: IllegalStateException was thrown.");
            } catch (Throwable e) {
                throw new RuntimeException("Test FAILED.", e);
            }
        }
    }

    protected static class ResetAction extends Action {
        public void run() {
            try {
                target.reset();
            } catch (IllegalStateException e) {
                System.out.println("Test PASSED: IllegalStateException was thrown.");
            } catch (Throwable e) {
                throw new RuntimeException("Test FAILED.", e);
            }
        }
    }

    static File file = new File("IMGP1001.JPG");

    Action action;
    ImageInputStream iis;
    ImageReader reader;

    protected ReadingInterruptionTest(Action action) {
        this.action = action;

        reader = ImageIO.getImageReadersByFormatName("JPEG").next();

        this.action.setTarget(reader);
    }

    public void doTest() {
        try {
            reader.addIIOReadProgressListener(this);
            iis = ImageIO.createImageInputStream(file);
            reader.setInput(iis);
            ImageReadParam p = reader.getDefaultReadParam();
            Thread.sleep(70);
            BufferedImage res = reader.read(0, p);
            Thread.sleep(70);
        } catch (Exception e) {
            /*
             * we do expect that concurrent attempt to dispose this
             * instance of image reader will be blocked. So, this image
             * should be read sucessfuly. Otherwise, something went wrong
             * and we need to report test failure.
             */
            throw new RuntimeException("Test FAILED", e);
        } finally {
            /*
             * it would happen that concurrent invocation of dispose() method
             * will be successful. Due to race condition it seems to be possible
             * that dispose operation will be performed after than read() operation
             * leaveled thread lock. In this case all subsequent calls for reader
             * methods should results in IllegalStateException. So, we treat
             * IllegalStateException as success. Everything else means test failure.
             */
            try {
                reader.reset();
            } catch (IllegalStateException e) {
                System.out.println("Expected exception was caught: " + e);
            } catch(Exception e) {
                throw new RuntimeException("Test FAILED.", e);
            }
        }
        System.out.println("Test PASSED.");
    }

    // listener medthods
    public void imageStarted(ImageReader source,
                                  int imageIndex) {} ;

    public void imageProgress(ImageReader source,
                              float percentageDone)
    {
        if (20f < percentageDone && percentageDone < 80f) {
            Thread t = new Thread(action);
            t.start();
        }
    };

    public void imageComplete(ImageReader source) {};


    public void sequenceStarted(ImageReader source,
                                int minIndex) {};

    public void sequenceComplete(ImageReader source) {};

    public void thumbnailStarted(ImageReader source,
                                 int imageIndex,
                                 int thumbnailIndex) {};

    public void thumbnailProgress(ImageReader source,
                                  float percentageDone) {};

    public void thumbnailComplete(ImageReader source) {};

    public void readAborted(ImageReader source) {};

    private static void createTestFile() {
        int w = 1280;
        int h = 1024;

        BufferedImage img = new
            BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = img.createGraphics();
        Color[] colors = { Color.red, Color.green, Color.blue };
        float[] dist = {0.0f, 0.5f, 1.0f };
        Point2D center = new Point2D.Float(0.5f * w, 0.5f * h);

        RadialGradientPaint p =
            new RadialGradientPaint(center, 0.5f * w, dist, colors);
        g.setPaint(p);
        g.fillRect(0, 0, w, h);
        g.dispose();

        try {
            System.out.println("Create test image " + file.getAbsolutePath());
            boolean b = ImageIO.write(img, "JPEG", file);
            if (!b) {
                throw new RuntimeException("Failed to create test image.");
            }
        } catch (IOException e) {
            throw new RuntimeException("Test failed", e);
        }
    }
}