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 * @summary Test for missing notifications in a high concurrency environment 28 * @author Jaroslav Bachorik 29 * @modules java.management 30 * @run clean MissingNotificationTest 31 * @run build MissingNotificationTest 32 * @run main MissingNotificationTest 33 * @key randomness 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 }