/*
 * Copyright (c) 2014, 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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 * questions.
 */

/*
 * @test
 * @bug 7153400
 * @summary Tests if [corePoolSize <= maximumPoolSize] invariant is enforced
 *          by corresponding setters
 */

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;

public class PoolSizesInvariant {

    public static void main(String[] args) {

        succeed(poolOfSize(2, 3), p -> p.setCorePoolSize(3));
        succeed(poolOfSize(2, 3), p -> p.setMaximumPoolSize(2));

        fail(poolOfSize(2, 3), p -> p.setCorePoolSize(4));
        fail(poolOfSize(2, 3), p -> p.setMaximumPoolSize(1));
    }


    private static ThreadPoolExecutor poolOfSize(int corePoolSize,
                                                 int maximumPoolSize) {
        return new ThreadPoolExecutor(corePoolSize, maximumPoolSize, 1,
                TimeUnit.MINUTES, new ArrayBlockingQueue<>(4));
    }

    private static void succeed(ThreadPoolExecutor p, Consumer<ThreadPoolExecutor> c) {
        try {
            c.accept(p);
        } catch (Throwable t) {
            throw new AssertionError("Test wasn't supposed to throw any exception", t);
        } finally {
            dispose(p);
        }
    }

    private static void fail(ThreadPoolExecutor p, Consumer<ThreadPoolExecutor> c) {
        try {
            c.accept(p);
        } catch (IllegalArgumentException e) {
            return;
        } catch (Throwable t) {
            throw new AssertionError("Test was supposed to throw IllegalArgumentException", t);
        } finally {
            dispose(p);
        }
        throw new AssertionError("Test was supposed to throw IllegalArgumentException");
    }

    private static void dispose(ThreadPoolExecutor p) {
        p.shutdownNow();
        try {
            p.awaitTermination(1, TimeUnit.MINUTES);
        } catch (InterruptedException e) {
            throw new RuntimeException("Should not happen", e);
        }
    }
}