1 /*
   2  * Copyright (c) 2010, 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 4517279
  26  * @summary Stochastic test of thread-local coder caches
  27  */
  28 
  29 import java.nio.*;
  30 import java.nio.charset.*;
  31 import java.util.*;
  32 
  33 
  34 public class BashCache {
  35 
  36     private static final int THREADS = 10;
  37     private static final int TRIALS = 1000;
  38 
  39     private static final Charset[] charsets
  40         = new Charset[] {
  41             Charset.forName("US-ASCII"),
  42             Charset.forName("UTF-8"),
  43             Charset.forName("CP1252"),
  44             Charset.forName("UTF-16BE") };
  45 
  46     private static volatile boolean failed = false;
  47 
  48     private static class Basher extends Thread {
  49 
  50         Random rnd = new Random(System.identityHashCode(this));
  51 
  52         public void run() {
  53             for (int i = 0; i < TRIALS; i++) {
  54                 Charset cs = charsets[rnd.nextInt(4)];
  55                 try {
  56                     if (rnd.nextBoolean()) {
  57                         cs.encode("hi mom");
  58                     } else {
  59                         cs.decode(ByteBuffer.wrap(new byte[] {
  60                             (byte)'x', (byte)'y',
  61                             (byte)'z', (byte)'z',
  62                             (byte)'y' }));
  63                     }
  64                 } catch (Exception x) {
  65                     x.printStackTrace();
  66                     failed = true;
  67                     return;
  68                 }
  69                 if (rnd.nextBoolean())
  70                     Thread.yield();
  71             }
  72         }
  73 
  74     }
  75 
  76     public static void main(String[] args) throws Exception {
  77         Charset cs = Charset.forName("us-ascii");
  78         Basher[] bashers = new Basher[THREADS];
  79         for (int i = 0; i < THREADS; i++) {
  80             bashers[i] = new Basher();
  81             bashers[i].start();
  82         }
  83         for (int i = 0; i < THREADS; i++)
  84             bashers[i].join();
  85         if (failed)
  86             throw new Exception("Test failed");
  87     }
  88 
  89 }