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 }