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/*
* Copyright 2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @test
* @bug 6747411
* @summary Check that EventClient instances don't leak threads.
* @author Eamonn McManus
*/
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.Set;
import java.util.TreeSet;
import javax.management.MBeanServer;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerDelegate;
import javax.management.MBeanServerNotification;
import javax.management.Notification;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.ObjectName;
import javax.management.event.EventClient;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXConnectorServer;
import javax.management.remote.JMXConnectorServerFactory;
import javax.management.remote.JMXServiceURL;
public class EventClientThreadTest {
private static final int MAX_TIME_SECONDS = 20;
private static final BlockingQueue<Notification> queue =
new ArrayBlockingQueue(100);
private static final NotificationListener queueListener =
new NotificationListener() {
public void handleNotification(Notification notification,
Object handback) {
queue.add(notification);
}
};
private static final NotificationFilter dummyFilter =
new NotificationFilter() {
public boolean isNotificationEnabled(Notification notification) {
return true;
}
};
public static void main(String[] args) throws Exception {
long start = System.currentTimeMillis();
long deadline = start + MAX_TIME_SECONDS * 1000;
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
JMXServiceURL url = new JMXServiceURL("service:jmx:rmi://");
JMXConnectorServer cs = JMXConnectorServerFactory.newJMXConnectorServer(
url, null, mbs);
cs.start();
JMXServiceURL addr = cs.getAddress();
JMXConnector cc = JMXConnectorFactory.connect(addr);
MBeanServerConnection mbsc = cc.getMBeanServerConnection();
ThreadMXBean threads = ManagementFactory.getThreadMXBean();
System.out.println("Opening and closing some EventClients...");
// If we create a connection, then create and destroy EventClients
// over it, then close it, there should be no "JMX *" threads left.
for (int i = 0; i < 5; i++)
test(mbsc);
cc.close();
showTime("opening and closing initial EventClients", start);
Set<String> jmxThreads = threadsMatching("JMX .*");
while (!jmxThreads.isEmpty() && System.currentTimeMillis() < deadline) {
Set<String> jmxThreadsNow = threadsMatching("JMX .*");
Set<String> gone = new TreeSet<String>(jmxThreads);
gone.removeAll(jmxThreadsNow);
for (String s : gone)
showTime("expiry of \"" + s + "\"", start);
jmxThreads = jmxThreadsNow;
Thread.sleep(10);
}
if (System.currentTimeMillis() >= deadline) {
showThreads(threads);
throw new Exception("Timed out waiting for JMX threads to expire");
}
showTime("waiting for JMX threads to expire", start);
System.out.println("TEST PASSED");
}
static void showThreads(ThreadMXBean threads) throws Exception {
long[] ids = threads.getAllThreadIds();
for (long id : ids) {
ThreadInfo ti = threads.getThreadInfo(id);
String name = (ti == null) ? "(defunct)" : ti.getThreadName();
System.out.printf("%4d %s\n", id, name);
}
}
static void showTime(String what, long start) {
long elapsed = System.currentTimeMillis() - start;
System.out.printf("Time after %s: %.3f s\n", what, elapsed / 1000.0);
}
static Set<String> threadsMatching(String pattern) {
Set<String> matching = new TreeSet<String>();
ThreadMXBean threads = ManagementFactory.getThreadMXBean();
long[] ids = threads.getAllThreadIds();
for (long id : ids) {
ThreadInfo ti = threads.getThreadInfo(id);
String name = (ti == null) ? "(defunct)" : ti.getThreadName();
if (name.matches(pattern))
matching.add(name);
}
return matching;
}
static void test(MBeanServerConnection mbsc) throws Exception {
final ObjectName delegateName = MBeanServerDelegate.DELEGATE_NAME;
final ObjectName testName = new ObjectName("test:type=Test");
EventClient ec = new EventClient(mbsc);
ec.addNotificationListener(delegateName, queueListener, null, null);
mbsc.createMBean(MBeanServerDelegate.class.getName(), testName);
mbsc.unregisterMBean(testName);
final String[] expectedTypes = {
MBeanServerNotification.REGISTRATION_NOTIFICATION,
MBeanServerNotification.UNREGISTRATION_NOTIFICATION,
};
for (String s : expectedTypes) {
Notification n = queue.poll(3, TimeUnit.SECONDS);
if (n == null)
throw new Exception("Timed out waiting for notif: " + s);
if (!(n instanceof MBeanServerNotification))
throw new Exception("Got notif of wrong class: " + n.getClass());
if (!n.getType().equals(s)) {
throw new Exception("Got notif of wrong type: " + n.getType() +
" (expecting " + s + ")");
}
}
ec.removeNotificationListener(delegateName, queueListener);
ec.addNotificationListener(delegateName, queueListener, dummyFilter, "foo");
ec.removeNotificationListener(delegateName, queueListener, dummyFilter, "foo");
ec.close();
}
}
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