Examples with ServerNotifForwarder com.sun.jmx.remote.internal.ServerNotifForwarder used on opensource projects

Example 1 with ServerNotifForwarder

use of com.sun.jmx.remote.internal.ServerNotifForwarder in project jdk8u_jdk by JetBrains.

the class DeadListenerTest method main.

public static void main(String[] args) throws Exception {
    final ObjectName delegateName = MBeanServerDelegate.DELEGATE_NAME;
    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    Noddy mbean = new Noddy();
    ObjectName name = new ObjectName("d:k=v");
    mbs.registerMBean(mbean, name);
    JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///");
    SnoopRMIServerImpl rmiServer = new SnoopRMIServerImpl();
    RMIConnectorServer cs = new RMIConnectorServer(url, null, rmiServer, mbs);
    cs.start();
    JMXServiceURL addr = cs.getAddress();
    assertTrue("No connections in new connector server", rmiServer.connections.isEmpty());
    JMXConnector cc = JMXConnectorFactory.connect(addr);
    MBeanServerConnection mbsc = cc.getMBeanServerConnection();
    assertTrue("One connection on server after client connect", rmiServer.connections.size() == 1);
    RMIConnectionImpl connection = rmiServer.connections.get(0);
    Method getServerNotifFwdM = RMIConnectionImpl.class.getDeclaredMethod("getServerNotifFwd");
    getServerNotifFwdM.setAccessible(true);
    ServerNotifForwarder serverNotifForwarder = (ServerNotifForwarder) getServerNotifFwdM.invoke(connection);
    Field listenerMapF = ServerNotifForwarder.class.getDeclaredField("listenerMap");
    listenerMapF.setAccessible(true);
    @SuppressWarnings("unchecked") Map<ObjectName, Set<?>> listenerMap = (Map<ObjectName, Set<?>>) listenerMapF.get(serverNotifForwarder);
    assertTrue("Server listenerMap initially empty", mapWithoutKey(listenerMap, delegateName).isEmpty());
    final AtomicInteger count1Val = new AtomicInteger();
    CountListener count1 = new CountListener(count1Val);
    mbsc.addNotificationListener(name, count1, null, null);
    WeakReference<CountListener> count1Ref = new WeakReference<>(count1);
    count1 = null;
    final AtomicInteger count2Val = new AtomicInteger();
    CountListener count2 = new CountListener(count2Val);
    NotificationFilterSupport dummyFilter = new NotificationFilterSupport();
    dummyFilter.enableType("");
    mbsc.addNotificationListener(name, count2, dummyFilter, "noddy");
    WeakReference<CountListener> count2Ref = new WeakReference<>(count2);
    count2 = null;
    assertTrue("One entry in listenerMap for two listeners on same MBean", mapWithoutKey(listenerMap, delegateName).size() == 1);
    Set<?> set = listenerMap.get(name);
    assertTrue("Set in listenerMap for MBean has two elements", set != null && set.size() == 2);
    assertTrue("Initial value of count1 == 0", count1Val.get() == 0);
    assertTrue("Initial value of count2 == 0", count2Val.get() == 0);
    Notification notif = new Notification("type", name, 0);
    mbean.sendNotification(notif);
    // Make sure notifs are working normally.
    long deadline = System.currentTimeMillis() + 2000;
    while ((count1Val.get() != 1 || count2Val.get() != 1) && System.currentTimeMillis() < deadline) {
        Thread.sleep(10);
    }
    assertTrue("New value of count1 == 1", count1Val.get() == 1);
    assertTrue("Initial value of count2 == 1", count2Val.get() == 1);
    // Make sure that removing a nonexistent listener from an existent MBean produces ListenerNotFoundException
    CountListener count3 = new CountListener();
    try {
        mbsc.removeNotificationListener(name, count3);
        assertTrue("Remove of nonexistent listener succeeded but should not have", false);
    } catch (ListenerNotFoundException e) {
    // OK: expected
    }
    // Make sure that removing a nonexistent listener from a nonexistent MBean produces ListenerNotFoundException
    ObjectName nonexistent = new ObjectName("foo:bar=baz");
    assertTrue("Nonexistent is nonexistent", !mbs.isRegistered(nonexistent));
    try {
        mbsc.removeNotificationListener(nonexistent, count3);
        assertTrue("Remove of listener from nonexistent MBean succeeded but should not have", false);
    } catch (ListenerNotFoundException e) {
    // OK: expected
    }
    // Now unregister our MBean, and check that notifs it sends no longer go anywhere.
    mbs.unregisterMBean(name);
    mbean.sendNotification(notif);
    Thread.sleep(200);
    assertTrue("New value of count1 == 1", count1Val.get() == 1);
    assertTrue("Initial value of count2 == 1", count2Val.get() == 1);
    // wait for the listener cleanup to take place upon processing notifications
    // waiting max. 5 secs
    int countdown = 50;
    while (countdown-- > 0 && (count1Ref.get() != null || count2Ref.get() != null)) {
        System.gc();
        Thread.sleep(100);
        System.gc();
    }
    // listener has been removed or the wait has timed out
    assertTrue("count1 notification listener has not been cleaned up", count1Ref.get() == null);
    assertTrue("count2 notification listener has not been cleaned up", count2Ref.get() == null);
    // Check that there is no trace of the listeners any more in ServerNotifForwarder.listenerMap.
    // THIS DEPENDS ON JMX IMPLEMENTATION DETAILS.
    // If the JMX implementation changes, the code here may have to change too.
    Set<?> setForUnreg = listenerMap.get(name);
    assertTrue("No trace of unregistered MBean: " + setForUnreg, setForUnreg == null);
}