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