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 30 import java.nio.*; 31 import java.nio.charset.*; 32 import java.util.*; 33 34 35 public 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 }