1 /*
   2  * Copyright (c) 2012, 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 8005281
  26  * @summary Test that the Properties storeToXML and loadFromXML methods are
  27  *   thread safe
  28  * @key randomness
  29  */
  30 
  31 import java.io.*;
  32 import java.util.Properties;
  33 import java.util.Random;
  34 import java.util.concurrent.Callable;
  35 import java.util.concurrent.Executors;
  36 import java.util.concurrent.ExecutorService;
  37 import java.util.concurrent.Future;
  38 
  39 public class ConcurrentLoadAndStoreXML {
  40 
  41     static final Random RAND = new Random();
  42 
  43     static volatile boolean done;
  44 
  45     /**
  46      * Simple task that bashes on storeToXML and loadFromXML until the "done"
  47      * flag is set.
  48      */
  49     static class Basher implements Callable<Void> {
  50         final Properties props;
  51 
  52         Basher(Properties props) {
  53             this.props = props;
  54         }
  55 
  56         public Void call() throws IOException {
  57             while (!done) {
  58 
  59                 // store as XML format
  60                 ByteArrayOutputStream out = new ByteArrayOutputStream();
  61                 props.storeToXML(out, null, "UTF-8");
  62 
  63                 // load from XML format
  64                 Properties p = new Properties();
  65                 ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
  66                 p.loadFromXML(in);
  67 
  68                 // check that the properties are as expected
  69                 if (!p.equals(props))
  70                     throw new RuntimeException("Properties not equal");
  71             }
  72             return null;
  73         }
  74     }
  75 
  76     public static void main(String[] args) throws Exception {
  77         final int NTASKS = 4 + RAND.nextInt(4);
  78 
  79         // create Bashers with Properties of random keys and values
  80         Basher[] basher = new Basher[NTASKS];
  81         for (int i=0; i<NTASKS; i++) {
  82             Properties props = new Properties();
  83             for (int j=0; j<RAND.nextInt(100); j++) {
  84                 String key = "k" + RAND.nextInt(1000);
  85                 String value = "v" + RAND.nextInt(1000);
  86                 props.put(key, value);
  87             }
  88             basher[i] = new Basher(props);
  89         }
  90 
  91         ExecutorService pool = Executors.newFixedThreadPool(NTASKS);
  92         try {
  93             // kick off the bashers
  94             Future<Void>[] task = new Future[NTASKS];
  95             for (int i=0; i<NTASKS; i++) {
  96                 task[i] = pool.submit(basher[i]);
  97             }
  98 
  99             // give them time to interfere with each each
 100             Thread.sleep(2000);
 101             done = true;
 102 
 103             // check the result
 104             for (int i=0; i<NTASKS; i++) {
 105                 task[i].get();
 106             }
 107         } finally {
 108             done = true;
 109             pool.shutdown();
 110         }
 111 
 112     }
 113 }
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