| /* |
| * Copyright (c) 2004, 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 6199899 |
| * @summary Tests reconnection done by a fetching notif thread. |
| * @author Shanliang JIANG |
| * |
| * @run clean NotifReconnectDeadlockTest |
| * @run build NotifReconnectDeadlockTest |
| * @run main NotifReconnectDeadlockTest |
| */ |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import javax.management.MBeanServer; |
| import javax.management.MBeanServerFactory; |
| import javax.management.Notification; |
| import javax.management.NotificationBroadcasterSupport; |
| import javax.management.NotificationListener; |
| import javax.management.ObjectName; |
| import javax.management.remote.JMXConnectionNotification; |
| 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; |
| |
| /** |
| * "This test checks for a bug whereby reconnection did not work if (a) it was |
| * initiated by the fetchNotifications thread and (b) it succeeded. These conditions |
| * are not usual, since connection failure is usually caused by either idle timeout |
| * (which doesn't usually happen if fetchNotifications is running) or communication |
| * problems (which are usually permanent so reconnection fails). But they can happen, |
| * so we test for them here. |
| * The test sets a very short idle timeout, and effectively suspends the |
| * fetchNotifications thread by having it invoke a listener with a delay in it. |
| * This means that the idle timeout happens. When the delayed listener returns, |
| * the fetchNotifications thread will attempt to reconnect, and this attempt should |
| * succeed, so we meet the two conditions above. |
| * The test succeeds if there is indeed a reconnection, detected by the connection |
| * listener seeing an OPENED notification. The connection listener should not see |
| * a CLOSED or FAILED notification." |
| */ |
| public class NotifReconnectDeadlockTest { |
| |
| public static void main(String[] args) throws Exception { |
| System.out.println( |
| ">>> Tests reconnection done by a fetching notif thread."); |
| |
| ObjectName oname = new ObjectName ("Default:name=NotificationEmitter"); |
| JMXServiceURL url = new JMXServiceURL("rmi", null, 0); |
| Map env = new HashMap(2); |
| env.put("jmx.remote.x.server.connection.timeout", new Long(serverTimeout)); |
| env.put("jmx.remote.x.client.connection.check.period", new Long(Long.MAX_VALUE)); |
| |
| final MBeanServer mbs = MBeanServerFactory.newMBeanServer(); |
| |
| mbs.registerMBean(new NotificationEmitter(), oname); |
| JMXConnectorServer server = JMXConnectorServerFactory.newJMXConnectorServer( |
| url, |
| env, |
| mbs); |
| server.start(); |
| |
| JMXServiceURL addr = server.getAddress(); |
| JMXConnector client = JMXConnectorFactory.connect(addr, env); |
| |
| Thread.sleep(100); // let pass the first client open notif if there is |
| client.getMBeanServerConnection().addNotificationListener(oname, |
| listener, |
| null, |
| null); |
| |
| client.addConnectionNotificationListener(listener, null, null); |
| |
| // max test time: 2 minutes |
| final long end = System.currentTimeMillis()+120000; |
| |
| synchronized(lock) { |
| while(clientState == null && System.currentTimeMillis() < end) { |
| mbs.invoke(oname, "sendNotifications", |
| new Object[] {new Notification("MyType", "", 0)}, |
| new String[] {"javax.management.Notification"}); |
| |
| try { |
| lock.wait(10); |
| } catch (Exception e) {} |
| } |
| } |
| |
| if (clientState == null) { |
| throw new RuntimeException( |
| "No reconnection happened, need to reconfigure the test."); |
| } else if (JMXConnectionNotification.FAILED.equals(clientState) || |
| JMXConnectionNotification.CLOSED.equals(clientState)) { |
| throw new RuntimeException("Failed to reconnect."); |
| } |
| |
| System.out.println(">>> Passed!"); |
| |
| client.removeConnectionNotificationListener(listener); |
| client.close(); |
| server.stop(); |
| } |
| |
| //-------------------------- |
| // private classes |
| //-------------------------- |
| public static class NotificationEmitter extends NotificationBroadcasterSupport |
| implements NotificationEmitterMBean { |
| |
| public void sendNotifications(Notification n) { |
| sendNotification(n); |
| } |
| } |
| |
| public interface NotificationEmitterMBean { |
| public void sendNotifications(Notification n); |
| } |
| |
| private final static NotificationListener listener = new NotificationListener() { |
| public void handleNotification(Notification n, Object hb) { |
| |
| // treat the client notif to know the end |
| if (n instanceof JMXConnectionNotification) { |
| if (!JMXConnectionNotification.NOTIFS_LOST.equals(n.getType())) { |
| |
| clientState = n.getType(); |
| System.out.println( |
| ">>> The client state has been changed to: "+clientState); |
| |
| synchronized(lock) { |
| lock.notifyAll(); |
| } |
| } |
| |
| return; |
| } |
| |
| System.out.println(">>> Do sleep to make reconnection."); |
| synchronized(lock) { |
| try { |
| lock.wait(listenerSleep); |
| } catch (Exception e) { |
| // OK |
| } |
| } |
| } |
| }; |
| |
| private static final long serverTimeout = 1000; |
| private static final long listenerSleep = serverTimeout*6; |
| |
| private static String clientState = null; |
| private static final int[] lock = new int[0]; |
| } |