/*

 * Copyright (c) 2012, 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.

 */

/* @test

 * @bug 7132889

 * @summary Test that register does not return a valid SelectionKey when

 *    invoked at around the time that the channel is closed

 */

import java.nio.channels.*;

import java.util.concurrent.*;

import java.util.Random;

import java.io.IOException;

public class RacyRegister {

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

        ExecutorService pool = Executors.newFixedThreadPool(1);

        try (Selector sel = Selector.open()) {

            int count = 100;

            while (count-- > 0) {

                final SocketChannel sc = SocketChannel.open();

                sc.configureBlocking(false);

                // close channel asynchronously

                Future<Void> result = pool.submit(new Callable<Void>() {

                    public Void call() throws IOException {

                        sc.close();

                        return null;

                    }

                });

                // attempt to register channel with Selector

                SelectionKey key = null;

                try {

                    key = sc.register(sel, SelectionKey.OP_READ);

                } catch (ClosedChannelException ignore) {

                }

                // ensure close is done

                result.get();

                // if we have a key then it should be invalid

                if (key != null && key.isValid())

                    throw new RuntimeException("Key is valid");

            }

        } finally {

            pool.shutdown();

        }

    }

}