test/java/util/concurrent/ThreadPoolExecutor/CoreThreadTimeOut.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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 volatile int passed = 0, failed = 0;
    static void pass() { passed++; }
    static void fail() { failed++; Thread.dumpStack(); }
    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 {System.out.println(x + " not equal to " + y); fail(); }}

    static 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("pool-[0-9]+-thread-[0-9]+"))
                count++;
        return count;
    }

    public static void main(String[] args) throws Throwable {
        final int threadCount = 10;
        BlockingQueue<Runnable> q
            = new ArrayBlockingQueue<Runnable>(2*threadCount);
        ThreadPoolExecutor tpe
            = new ThreadPoolExecutor(threadCount, threadCount,
                                     30, TimeUnit.MILLISECONDS,
                                     q);
        equal(tpe.getCorePoolSize(), threadCount);
        check(! tpe.allowsCoreThreadTimeOut());
        tpe.allowCoreThreadTimeOut(true);
        check(tpe.allowsCoreThreadTimeOut());
        equal(countExecutorThreads(), 0);
        for (int i = 0; i < threadCount; i++)
            tpe.submit(new Runnable() { public void run() {}});
        equal(countExecutorThreads(), threadCount);
        Thread.sleep(500);
        equal(countExecutorThreads(), 0);
        tpe.shutdown();
        check(tpe.allowsCoreThreadTimeOut());

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new Exception("Some tests failed");
    }
}