/*

 * Copyright (c) 2013, 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

 * @summary Test verifies that jpeg writer instances are collected

 *          even if destroy() or reset() methods is not invoked.

 *

 * @run main JpegWriterLeakTest

 */

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.lang.ref.Reference;

import java.lang.ref.ReferenceQueue;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.imageio.ImageWriter;

import javax.imageio.stream.ImageOutputStream;

public class JpegWriterLeakTest {

    public static void main(String[] args) {

        final ReferenceQueue<ImageWriter> queue = new ReferenceQueue<>();

        final ArrayList<Reference<? extends ImageWriter>> refs = new ArrayList<>();

        int count = 2;

        do {

            ImageWriter writer =

                    ImageIO.getImageWritersByFormatName("jpeg").next();

            final WeakReference<? extends ImageWriter> ref =

                    new WeakReference<>(writer, queue);

            refs.add(ref);

            try {

                final ImageOutputStream os =

                        ImageIO.createImageOutputStream(new ByteArrayOutputStream());

                writer.setOutput(os);

                writer.write(getImage());

                // NB: dispose() or reset() workarounds the problem.

            } catch (IOException e) {

            } finally {

                writer = null;

            }

            count--;

        } while (count > 0);

        System.out.println("Wait for GC...");

        final long testTimeOut = 60000L;

        final long startTime = System.currentTimeMillis();

        while (!refs.isEmpty()) {

            // check for the test timeout

            final long now = System.currentTimeMillis();

            if (now - startTime > testTimeOut) {

                System.out.println();

                throw new RuntimeException("Test FAILED.");

            }

            System.gc();

            try {

                System.out.print(".");

                Thread.sleep(1000);

            } catch (InterruptedException e) {

            };

            Reference<? extends ImageWriter> r = queue.poll();

            if (r != null) {

                System.out.println("Got reference: " + r);

                refs.remove(r);

            }

        }

        System.out.println("Test PASSED.");

    }

    private static BufferedImage getImage() {

        int width = 2500;

        int height = new Random().nextInt(2500) + 1;

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics2D g = image.createGraphics();

        g.setColor(Color.blue);

        g.fillRect(0, 0, width, height);

        return image;

    }

}