1 /*
   2  * Copyright (c) 2001, 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 4526754
  26  * @summary Test Pipe scattering reads
  27  * @key randomness
  28  */
  29 
  30 import java.nio.channels.*;
  31 import java.nio.*;
  32 import java.util.Random;
  33 
  34 public class ScatteringRead {
  35 
  36     private static Random generator = new Random();
  37 
  38     public static void main(String[] args) throws Exception {
  39         scScatter();
  40     }
  41 
  42     private static void scScatter() throws Exception {
  43         Pipe p = Pipe.open();
  44         Pipe.SinkChannel sink = p.sink();
  45         Pipe.SourceChannel source = p.source();
  46         sink.configureBlocking(false);
  47 
  48         ByteBuffer outgoingdata = ByteBuffer.allocateDirect(30);
  49         byte[] someBytes = new byte[30];
  50         generator.nextBytes(someBytes);
  51         outgoingdata.put(someBytes);
  52         outgoingdata.flip();
  53 
  54         int totalWritten = 0;
  55         while (totalWritten < 30) {
  56             int written = sink.write(outgoingdata);
  57             if (written < 0)
  58                 throw new Exception("Write failed");
  59             totalWritten += written;
  60         }
  61 
  62         ByteBuffer[] bufs = new ByteBuffer[3];
  63         for(int i=0; i<3; i++)
  64             bufs[i] = ByteBuffer.allocateDirect(10);
  65         long numBytesRead = source.read(bufs);
  66         if (numBytesRead < 30)
  67             throw new Exception("Pipe test failed");
  68         sink.close();
  69         source.close();
  70     }
  71 
  72 }