1 /*
   2  * Copyright (c) 2008, 2015, 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 6809322
  27  * @key randomness
  28  * @summary Test for missing notifications in a high concurrency environment
  29  * @author Jaroslav Bachorik
  30  *
  31  * @run clean MissingNotificationTest
  32  * @run build MissingNotificationTest
  33  * @run main MissingNotificationTest
  34  */
  35 
  36 import java.util.Date;
  37 import java.util.Random;
  38 import java.util.concurrent.ExecutorService;
  39 import java.util.concurrent.Executors;
  40 import java.util.concurrent.TimeUnit;
  41 import javax.management.timer.Timer;
  42 import javax.management.Notification;
  43 import javax.management.NotificationListener;
  44 
  45 public class MissingNotificationTest {
  46     private static int TASK_COUNT = 10000;
  47     private static long fixedDelay = 0;// anything bigger than 100 and no alarms remain unfired
  48 
  49     private static class NotifListener implements NotificationListener {
  50 
  51         int count;
  52 
  53         public synchronized void handleNotification(Notification notification, Object handback) {
  54             count++;
  55         }
  56 
  57         synchronized int getCount() {
  58             return count;
  59         }
  60     }
  61 
  62     public static void main(String[] args) throws Exception {
  63         System.out.println(
  64             ">>> Test for missing notifications.");
  65 
  66         System.out.println(">>> Create a Timer object.");
  67         final Timer timer = new Timer();
  68 
  69         timer.start();
  70 
  71         NotifListener listener = new NotifListener();
  72         timer.addNotificationListener(listener, null, null);
  73 
  74         ExecutorService executor = Executors.newFixedThreadPool(100);
  75         final Random rand = new Random();
  76 
  77 
  78         for (int i = 0; i < TASK_COUNT; i++) {
  79             executor.execute(new Runnable() {
  80                 public void run() {
  81                     long dateMillis = System.currentTimeMillis() + fixedDelay + rand.nextInt(2000);
  82                     Date date = new Date(dateMillis);
  83                     timer.addNotification("type", "msg", "userData", date);
  84                 }
  85             });
  86 
  87         }
  88 
  89         executor.shutdown();
  90         executor.awaitTermination(20, TimeUnit.SECONDS);
  91 
  92         waitForNotificationsToEnd(listener);
  93 
  94         timer.stop();
  95 
  96         if (listener.count < TASK_COUNT) {
  97             throw new RuntimeException("Not fired: " + (TASK_COUNT - listener.count));
  98         } else {
  99             System.out.println(">>> All notifications handled OK");
 100         }
 101 
 102         System.out.println(">>> Bye bye!");
 103     }
 104 
 105     /**
 106      * Will return when all notifications are handled or after 10sec. of no new
 107      * notifications
 108      *
 109      * @param listener
 110      * @throws InterruptedException
 111      */
 112     private static void waitForNotificationsToEnd(NotifListener listener)
 113             throws InterruptedException {
 114         int oldCout = listener.getCount();
 115         int noChangeCounter = 1;
 116         while (listener.getCount() < TASK_COUNT) {
 117             Thread.sleep(1000);
 118             System.out.print('.');
 119             if (oldCout == listener.getCount())//no change
 120             {
 121                 if (++noChangeCounter > 10) {
 122                     break;
 123                 }
 124             } else {
 125                 noChangeCounter = 1;
 126             }
 127 
 128             oldCout = listener.getCount();
 129         }
 130         System.out.println();
 131     }
 132 }