1 /*

     2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /* @test

    25  * @bug 7132889

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

    27  *    invoked at around the time that the channel is closed

    28  */

    29 

    30 import java.nio.channels.*;

    31 import java.util.concurrent.*;

    32 import java.util.Random;

    33 import java.io.IOException;

    34 

    35 public class RacyRegister {

    36 

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

    38         ExecutorService pool = Executors.newFixedThreadPool(1);

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

    40             int count = 100;

    41             while (count-- > 0) {

    42                 final SocketChannel sc = SocketChannel.open();

    43                 sc.configureBlocking(false);

    44 

    45                 // close channel asynchronously

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

    47                     public Void call() throws IOException {

    48                         sc.close();

    49                         return null;

    50                     }

    51                 });

    52 

    53                 // attempt to register channel with Selector

    54                 SelectionKey key = null;

    55                 try {

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

    57                 } catch (ClosedChannelException ignore) {

    58                 }

    59 

    60                 // ensure close is done

    61                 result.get();

    62 

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

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

    65                     throw new RuntimeException("Key is valid");

    66             }

    67         } finally {

    68             pool.shutdown();

    69         }

    70     }

    71 }