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 /*
  25  * @test
  26  * @bug 6989440
  27  * @summary Verify ConcurrentModificationException is not thrown with multiple
  28  *     thread accesses.
  29  * @compile -XDignore.symbol.file=true Bug6989440.java
  30  * @run main Bug6989440
  31  */
  32 import java.text.spi.DateFormatProvider;
  33 import java.util.spi.LocaleNameProvider;
  34 import java.util.spi.LocaleServiceProvider;
  35 import java.util.spi.TimeZoneNameProvider;
  36 
  37 import sun.util.locale.provider.LocaleServiceProviderPool;
  38 
  39 public class Bug6989440 {
  40     static volatile boolean failed;  // false
  41     static final int THREADS = 50;
  42 
  43     public static void main(String[] args) throws Exception {
  44         Thread[] threads = new Thread[THREADS];
  45         for (int i=0; i<threads.length; i++)
  46             threads[i] = new TestThread();
  47         for (int i=0; i<threads.length; i++)
  48             threads[i].start();
  49         for (int i=0; i<threads.length; i++)
  50             threads[i].join();
  51 
  52         if (failed)
  53             throw new RuntimeException("Failed: check output");
  54     }
  55 
  56     static class TestThread extends Thread {
  57         private Class<? extends LocaleServiceProvider> cls;
  58         private static int count;
  59 
  60         public TestThread(Class<? extends LocaleServiceProvider> providerClass) {
  61             cls = providerClass;
  62         }
  63 
  64         public TestThread() {
  65             int which = count++ % 3;
  66             switch (which) {
  67                 case 0 : cls = LocaleNameProvider.class; break;
  68                 case 1 : cls = TimeZoneNameProvider.class; break;
  69                 case 2 : cls = DateFormatProvider.class; break;
  70                 default : throw new AssertionError("Should not reach here");
  71             }
  72         }
  73 
  74         public void run() {
  75             try {
  76                 LocaleServiceProviderPool pool = LocaleServiceProviderPool.getPool(cls);
  77                 pool.getAvailableLocales();
  78             } catch (Exception e) {
  79                 System.out.println(e);
  80                 e.printStackTrace();
  81                 failed = true;
  82             }
  83         }
  84     }
  85 }