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 }