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  * @run main ConcurrentLoadAndStoreXML
  29  * @run main/othervm -Dsun.util.spi.XmlPropertiesProvider=jdk.internal.util.xml.BasicXmlPropertiesProvider ConcurrentLoadAndStoreXML
  30 
  31  */
  32 
  33 import java.io.*;
  34 import java.util.Properties;
  35 import java.util.Random;
  36 import java.util.concurrent.Callable;
  37 import java.util.concurrent.Executors;
  38 import java.util.concurrent.ExecutorService;
  39 import java.util.concurrent.Future;
  40 
  41 public class ConcurrentLoadAndStoreXML {
  42 
  43     static final Random RAND = new Random();
  44 
  45     static volatile boolean done;
  46 
  47     /**
  48      * Simple task that bashes on storeToXML and loadFromXML until the "done"
  49      * flag is set.
  50      */
  51     static class Basher implements Callable<Void> {
  52         final Properties props;
  53 
  54         Basher(Properties props) {
  55             this.props = props;
  56         }
  57 
  58         public Void call() throws IOException {
  59             while (!done) {
  60 
  61                 // store as XML format
  62                 ByteArrayOutputStream out = new ByteArrayOutputStream();
  63                 props.storeToXML(out, null, "UTF-8");
  64 
  65                 // load from XML format
  66                 Properties p = new Properties();
  67                 ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
  68                 p.loadFromXML(in);
  69 
  70                 // check that the properties are as expected
  71                 if (!p.equals(props))
  72                     throw new RuntimeException("Properties not equal");
  73             }
  74             return null;
  75         }
  76     }
  77 
  78     public static void main(String[] args) throws Exception {
  79         final int NTASKS = 4 + RAND.nextInt(4);
  80 
  81         // create Bashers with Properties of random keys and values
  82         Basher[] basher = new Basher[NTASKS];
  83         for (int i=0; i<NTASKS; i++) {
  84             Properties props = new Properties();
  85             for (int j=0; j<RAND.nextInt(100); j++) {
  86                 String key = "k" + RAND.nextInt(1000);
  87                 String value = "v" + RAND.nextInt(1000);
  88                 props.put(key, value);
  89             }
  90             basher[i] = new Basher(props);
  91         }
  92 
  93         ExecutorService pool = Executors.newFixedThreadPool(NTASKS);
  94         try {
  95             // kick off the bashers
  96             Future<Void>[] task = new Future[NTASKS];
  97             for (int i=0; i<NTASKS; i++) {
  98                 task[i] = pool.submit(basher[i]);
  99             }
 100 
 101             // give them time to interfere with each each
 102             Thread.sleep(2000);
 103             done = true;
 104 
 105             // check the result
 106             for (int i=0; i<NTASKS; i++) {
 107                 task[i].get();
 108             }
 109         } finally {
 110             done = true;
 111             pool.shutdown();
 112         }
 113 
 114     }
 115 }