Quellcode-Bibliothek Stress.java Sprache: JAVA

/*
* Copyright (c) 2008, 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.
*/

import static java.util.concurrent.TimeUnit.NANOSECONDS;

import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;

/**
* This is not a regression test, but a stress benchmark test for
* 6609775: Reduce context switches in DelayQueue due to signalAll
*
* This runs in the same wall clock time, but much reduced cpu time,
* with the changes for 6609775.
*/
public class Stress {

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

        final DelayQueue<Delayed> q = new DelayQueue<>();
        final long t0 = System.nanoTime();
        for (long i = 0; i < 1000; i++) {
            final long expiry = t0 + i*10L*1000L*1000L;
            q.add(new Delayed() {
                    public long getDelay(TimeUnit unit) {
                        return unit.convert(expiry - System.nanoTime(),
                                            NANOSECONDS);
                    }
                    public int compareTo(Delayed x) {
                        long d = getDelay(NANOSECONDS)
                            - x.getDelay(NANOSECONDS);
                        return d < 0 ? -1 : d > 0 ? 1 : 0; }});
        }

        for (int i = 0; i < 300; i++)
            new Thread() { public void run() {
                try {
                    while (!q.isEmpty())
                        q.poll(10L, TimeUnit.SECONDS);
                } catch (Throwable t) { t.printStackTrace(); }
            }}.start();
    }
}

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