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 *

 * This code is free software; you can redistribute it and/or modify it

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 * 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.

 *

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 */

/*

 * @test

 * @bug 6233235 6268386

 * @summary Test allowsCoreThreadTimeOut

 * @author Martin Buchholz

 */

import java.util.concurrent.*;

public class CoreThreadTimeOut {

    static class IdentifiableThreadFactory implements ThreadFactory {

        static ThreadFactory defaultThreadFactory

            = Executors.defaultThreadFactory();

        public Thread newThread(Runnable r) {

            Thread t = defaultThreadFactory.newThread(r);

            t.setName("CoreThreadTimeOut-" + t.getName());

            return t;

        }

    }

    int countExecutorThreads() {

        Thread[] threads = new Thread[Thread.activeCount()+100];

        Thread.enumerate(threads);

        int count = 0;

        for (Thread t : threads)

            if (t != null &&

                t.getName().matches

                ("CoreThreadTimeOut-pool-[0-9]+-thread-[0-9]+"))

                count++;

        return count;

    }

    long millisElapsedSince(long t0) {

        return (System.nanoTime() - t0) / (1000L * 1000L);

    }

    void test(String[] args) throws Throwable {

        final int threadCount = 10;

        final int timeoutMillis = 30;

        BlockingQueue<Runnable> q

            = new ArrayBlockingQueue<Runnable>(2*threadCount);

        ThreadPoolExecutor tpe

            = new ThreadPoolExecutor(threadCount, threadCount,

                                     timeoutMillis, TimeUnit.MILLISECONDS,

                                     q, new IdentifiableThreadFactory());

        equal(tpe.getCorePoolSize(), threadCount);

        check(! tpe.allowsCoreThreadTimeOut());

        tpe.allowCoreThreadTimeOut(true);

        check(tpe.allowsCoreThreadTimeOut());

        equal(countExecutorThreads(), 0);

        long t0 = System.nanoTime();

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

            tpe.submit(new Runnable() { public void run() {}});

        int count = countExecutorThreads();

        if (millisElapsedSince(t0) < timeoutMillis)

            equal(count, threadCount);

        while (countExecutorThreads() > 0 &&

               millisElapsedSince(t0) < 10 * 1000);

        equal(countExecutorThreads(), 0);

        tpe.shutdown();

        check(tpe.allowsCoreThreadTimeOut());

        check(tpe.awaitTermination(10, TimeUnit.SECONDS));

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

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

    }

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

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

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

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

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

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

    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 {

        new CoreThreadTimeOut().instanceMain(args);}

    public void instanceMain(String[] args) throws Throwable {

        try {test(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");}

}