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 }