jdk-24/jdk/test/java/nio/channels/Selector/WakeupSpeed.java

/*
 * Copyright (c) 2001, 2010, 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.
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 */

/* @test
 * @bug 4467968
 * @summary Tests wether wakeup makes the next select() call return immediately
 */

import java.io.IOException;
import java.nio.channels.Selector;


public class WakeupSpeed {

    public static void main(String argv[]) throws Exception {
        int waitTime = 4000;
        Selector selector = Selector.open();
        try {
            selector.wakeup();

            long t1 = System.currentTimeMillis();
            selector.select(waitTime);
            long t2 = System.currentTimeMillis();
            long totalTime = t2 - t1;

            if (totalTime > waitTime)
                throw new RuntimeException("Test failed");
        } finally {
            selector.close();
        }
    }

}