/*

 * 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 6522773

 * @summary Test changes to STPE core pool size

 * @author Martin Buchholz

 */

import java.util.concurrent.ScheduledThreadPoolExecutor;

import java.util.concurrent.ThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

public class ModifyCorePoolSize {

    static void awaitPoolSize(ThreadPoolExecutor pool, int n) {

        while (pool.getPoolSize() != n) Thread.yield();

        pass();

    }

    static void setCorePoolSize(ThreadPoolExecutor pool, int n) {

        pool.setCorePoolSize(n);

        equal(pool.getCorePoolSize(), n);

        awaitPoolSize(pool, n);

    }

    static void realMain(String[] args) throws Throwable {

        final int size = 10;

        final ScheduledThreadPoolExecutor pool

            = new ScheduledThreadPoolExecutor(size);

        final Runnable nop = new Runnable() { public void run() {}};

        for (int i = 0; i < size; i++)

            pool.scheduleAtFixedRate(nop, 100L * (i + 1),

                                     1000L, TimeUnit.MILLISECONDS);

        awaitPoolSize(pool, size);

        setCorePoolSize(pool, size - 3);

        setCorePoolSize(pool, size + 3);

        pool.shutdownNow();

        check(pool.awaitTermination(1L, TimeUnit.DAYS));

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String msg) {System.out.println(msg); fail();}

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    static void check(boolean cond) {if (cond) pass(); else fail();}

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}