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