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 * Copyright (c) 2018, 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

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 */

import java.awt.Button;

import java.awt.Frame;

import java.util.concurrent.TimeUnit;

import sun.awt.SunToolkit;

/**

 * @test

 * @key headful

 * @bug 8211435

 * @requires (os.family == "mac")

 * @modules java.desktop/sun.awt

 */

public final class NullActiveWindowOnFocusLost {

    private static volatile long endtime;

    private static Throwable failed;

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

        // Will run the test no more than 30 seconds

        endtime = System.nanoTime() + TimeUnit.SECONDS.toNanos(30);

        Thread.setDefaultUncaughtExceptionHandler((t, e) -> failed = e);

        final Thread[] threads = new Thread[20];

        for (int i = 0; i < threads.length; i++) {

            threads[i] = testThread(i);

        }

        for (final Thread thread : threads) {

            thread.start();

        }

        for (final Thread thread : threads) {

            thread.join();

        }

        if (failed != null) {

            failed.printStackTrace();

            throw new RuntimeException(failed);

        }

    }

    private static Thread testThread(int index) {

        return new Thread(new ThreadGroup("TG " + index), () -> {

            SunToolkit.createNewAppContext();

            while (!isComplete()) {

                final Frame frame = new Frame();

                frame.setSize(300, 300);

                frame.add(new Button("Button"));

                frame.setLocationRelativeTo(null);

                frame.setVisible(true);

                try {

                    Thread.sleep(index); // increase probability of the failure

                } catch (InterruptedException ignored) {

                }

                frame.dispose();

            }

        });

    }

    private static boolean isComplete() {

        return endtime - System.nanoTime() < 0 || failed != null;

    }

}