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 * Copyright Amazon.com Inc. 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.image.ColorModel;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

/**
 * @test
 * @bug 8299772
 * @summary "ColorModel.getRGBdefault()" should always return the same object
 */
public final class RGBdefaultSingleton {

    private static volatile boolean failed;
    private static final Map<ColorModel, ?> map =
            Collections.synchronizedMap(new IdentityHashMap<>(1));

    public static void main(String[] args) throws Exception {
        Thread[] ts = new Thread[10];
        CountDownLatch latch = new CountDownLatch(ts.length);
        for (int i = 0; i < ts.length; i++) {
            ts[i] = new Thread(() -> {
                latch.countDown();
                try {
                    ColorModel cm;
                    latch.await();
                    cm = ColorModel.getRGBdefault();
                    map.put(cm, null);
                } catch (Throwable t) {
                    t.printStackTrace();
                    failed = true;
                }
            });
        }
        for (Thread t : ts) {
            t.start();
        }
        for (Thread t : ts) {
            t.join();
        }
        if (failed) {
            throw new RuntimeException("Unexpected exception");
        } else if (map.size() != 1) {
            throw new RuntimeException("The size of the map != 1");
        }
    }
}