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/*
* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6809322
* @key randomness
* @summary Test for missing notifications in a high concurrency environment
* @author Jaroslav Bachorik
*
* @run clean MissingNotificationTest
* @run build MissingNotificationTest
* @run main MissingNotificationTest
*/
import java.util.Date;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import javax.management.timer.Timer;
import javax.management.Notification;
import javax.management.NotificationListener;
public class MissingNotificationTest {
private static int TASK_COUNT = 10000;
private static long fixedDelay = 0;// anything bigger than 100 and no alarms remain unfired
private static class NotifListener implements NotificationListener {
int count;
public synchronized void handleNotification(Notification notification, Object handback) {
count++;
}
synchronized int getCount() {
return count;
}
}
public static void main(String[] args) throws Exception {
System.out.println(
">>> Test for missing notifications.");
System.out.println(">>> Create a Timer object.");
final Timer timer = new Timer();
timer.start();
NotifListener listener = new NotifListener();
timer.addNotificationListener(listener, null, null);
ExecutorService executor = Executors.newFixedThreadPool(100);
final Random rand = new Random();
for (int i = 0; i < TASK_COUNT; i++) {
executor.execute(new Runnable() {
public void run() {
long dateMillis = System.currentTimeMillis() + fixedDelay + rand.nextInt(2000);
Date date = new Date(dateMillis);
timer.addNotification("type", "msg", "userData", date);
}
});
}
executor.shutdown();
executor.awaitTermination(20, TimeUnit.SECONDS);
waitForNotificationsToEnd(listener);
timer.stop();
if (listener.count < TASK_COUNT) {
throw new RuntimeException("Not fired: " + (TASK_COUNT - listener.count));
} else {
System.out.println(">>> All notifications handled OK");
}
System.out.println(">>> Bye bye!");
}
/**
* Will return when all notifications are handled or after 10sec. of no new
* notifications
*
* @param listener
* @throws InterruptedException
*/
private static void waitForNotificationsToEnd(NotifListener listener)
throws InterruptedException {
int oldCout = listener.getCount();
int noChangeCounter = 1;
while (listener.getCount() < TASK_COUNT) {
Thread.sleep(1000);
System.out.print('.');
if (oldCout == listener.getCount())//no change
{
if (++noChangeCounter > 10) {
break;
}
} else {
noChangeCounter = 1;
}
oldCout = listener.getCount();
}
System.out.println();
}
}
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