1 /*

     2  * Copyright (c) 2014, 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 /*

    25  * @test

    26  * @bug 8025619

    27  * @summary Verify that a channel obtained from a closed stream is truly closed.

    28  */

    29 import java.io.File;

    30 import java.io.FileInputStream;

    31 import java.io.FileOutputStream;

    32 import java.io.IOException;

    33 import java.io.RandomAccessFile;

    34 import java.nio.channels.ClosedChannelException;

    35 import java.nio.channels.FileChannel;

    36 

    37 public class GetClosedChannel {

    38     private static final int NUM_CHANNELS = 3;

    39     private static final int NUM_EXCEPTIONS = 2*NUM_CHANNELS;

    40 

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

    42         int exceptions = 0;

    43         int openChannels = 0;

    44 

    45         for (int i = 0; i < NUM_CHANNELS; i++) {

    46             File f = File.createTempFile("fcbug", ".tmp");

    47             f.deleteOnExit();

    48 

    49             FileChannel fc = null;

    50             boolean shared = false;

    51             switch (i) {

    52                 case 0:

    53                     System.out.print("FileInputStream...");

    54                     FileInputStream fis = new FileInputStream(f);

    55                     fis.close();

    56                     fc = fis.getChannel();

    57                     if (fc.isOpen()) {

    58                         System.err.println("FileInputStream channel should not be open");

    59                         openChannels++;

    60                     }

    61                     shared = true;

    62                     break;

    63                 case 1:

    64                     System.out.print("FileOutputStream...");

    65                     FileOutputStream fos = new FileOutputStream(f);

    66                     fos.close();

    67                     fc = fos.getChannel();

    68                     if (fc.isOpen()) {

    69                         System.err.println("FileOutputStream channel should not be open");

    70                         openChannels++;

    71                     }

    72                     break;

    73                 case 2:

    74                     System.out.print("RandomAccessFile...");

    75                     RandomAccessFile raf = new RandomAccessFile(f, "rw");

    76                     raf.close();

    77                     fc = raf.getChannel();

    78                     if (fc.isOpen()) {

    79                         System.err.println("RandomAccessFile channel should not be open");

    80                         openChannels++;

    81                     }

    82                     break;

    83                 default:

    84                     assert false : "Should not get here";

    85             }

    86 

    87             try {

    88                 long position = fc.position();

    89                 System.err.println("Channel "+i+" position is "+position);

    90             } catch (ClosedChannelException cce) {

    91                 exceptions++;

    92             }

    93 

    94             try {

    95                 fc.tryLock(0, Long.MAX_VALUE, shared);

    96             } catch (ClosedChannelException e) {

    97                 System.out.println("OK");

    98                 exceptions++;

    99             } catch (Error err) {

   100                 System.err.println(err);

   101             }

   102         }

   103 

   104         if (exceptions != NUM_EXCEPTIONS || openChannels != 0) {

   105             throw new RuntimeException("FAILED:" +

   106                     " ClosedChannelExceptions: expected: " + NUM_EXCEPTIONS +

   107                     " actual: " + exceptions + ";" + System.lineSeparator() +

   108                     " number of open channels: expected: 0 " +

   109                     " actual: " + openChannels + ".");

   110         }

   111     }

   112 }