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 * @key randomness
28 */
29
30import java.nio.*;
31import java.nio.charset.*;
32import java.util.*;
33
34
35public class BashCache {
36
37    private static final int THREADS = 10;
38    private static final int TRIALS = 1000;
39
40    private static final Charset[] charsets
41        = new Charset[] {
42            Charset.forName("US-ASCII"),
43            Charset.forName("UTF-8"),
44            Charset.forName("CP1252"),
45            Charset.forName("UTF-16BE") };
46
47    private static volatile boolean failed = false;
48
49    private static class Basher extends Thread {
50
51        Random rnd = new Random(System.identityHashCode(this));
52
53        public void run() {
54            for (int i = 0; i < TRIALS; i++) {
55                Charset cs = charsets[rnd.nextInt(4)];
56                try {
57                    if (rnd.nextBoolean()) {
58                        cs.encode("hi mom");
59                    } else {
60                        cs.decode(ByteBuffer.wrap(new byte[] {
61                            (byte)'x', (byte)'y',
62                            (byte)'z', (byte)'z',
63                            (byte)'y' }));
64                    }
65                } catch (Exception x) {
66                    x.printStackTrace();
67                    failed = true;
68                    return;
69                }
70                if (rnd.nextBoolean())
71                    Thread.yield();
72            }
73        }
74
75    }
76
77    public static void main(String[] args) throws Exception {
78        Charset cs = Charset.forName("us-ascii");
79        Basher[] bashers = new Basher[THREADS];
80        for (int i = 0; i < THREADS; i++) {
81            bashers[i] = new Basher();
82            bashers[i].start();
83        }
84        for (int i = 0; i < THREADS; i++)
85            bashers[i].join();
86        if (failed)
87            throw new Exception("Test failed");
88    }
89
90}
91