| /* |
| * 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Martin Buchholz and Jason Mehrens with assistance from |
| * members of JCP JSR-166 Expert Group and released to the public |
| * domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| /* |
| * @test |
| * @summary Only one thread should be created when a thread needs to |
| * be kept alive to service a delayed task waiting in the queue. |
| * @library /lib/testlibrary/ |
| */ |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.atomic.AtomicLong; |
| import jdk.testlibrary.Utils; |
| |
| public class ThreadRestarts { |
| static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); |
| static final long FAR_FUTURE_MS = 10 * LONG_DELAY_MS; |
| |
| public static void main(String[] args) throws Exception { |
| test(false); |
| test(true); |
| } |
| |
| private static void test(boolean allowTimeout) throws Exception { |
| CountingThreadFactory ctf = new CountingThreadFactory(); |
| ScheduledThreadPoolExecutor stpe |
| = new ScheduledThreadPoolExecutor(10, ctf); |
| try { |
| // schedule a dummy task in the "far future" |
| Runnable nop = new Runnable() { public void run() {}}; |
| stpe.schedule(nop, FAR_FUTURE_MS, MILLISECONDS); |
| stpe.setKeepAliveTime(1L, MILLISECONDS); |
| stpe.allowCoreThreadTimeOut(allowTimeout); |
| MILLISECONDS.sleep(12L); |
| } finally { |
| stpe.shutdownNow(); |
| if (!stpe.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) |
| throw new AssertionError("timed out"); |
| } |
| if (ctf.count.get() > 1) |
| throw new AssertionError( |
| String.format("%d threads created, 1 expected", |
| ctf.count.get())); |
| } |
| |
| static class CountingThreadFactory implements ThreadFactory { |
| final AtomicLong count = new AtomicLong(0L); |
| |
| public Thread newThread(Runnable r) { |
| count.getAndIncrement(); |
| Thread t = new Thread(r); |
| t.setDaemon(true); |
| return t; |
| } |
| } |
| } |