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Example 1 with RMIConnectionImpl

use of javax.management.remote.rmi.RMIConnectionImpl 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);
}
Also used : ServerNotifForwarder(com.sun.jmx.remote.internal.ServerNotifForwarder) Set(java.util.Set) Notification(javax.management.Notification) Field(java.lang.reflect.Field) JMXConnector(javax.management.remote.JMXConnector) WeakReference(java.lang.ref.WeakReference) ListenerNotFoundException(javax.management.ListenerNotFoundException) MBeanServer(javax.management.MBeanServer) JMXServiceURL(javax.management.remote.JMXServiceURL) Method(java.lang.reflect.Method) ObjectName(javax.management.ObjectName) RMIConnectorServer(javax.management.remote.rmi.RMIConnectorServer) AtomicInteger(java.util.concurrent.atomic.AtomicInteger) NotificationFilterSupport(javax.management.NotificationFilterSupport) RMIConnectionImpl(javax.management.remote.rmi.RMIConnectionImpl) HashMap(java.util.HashMap) Map(java.util.Map) MBeanServerConnection(javax.management.MBeanServerConnection)

Aggregations

ServerNotifForwarder (com.sun.jmx.remote.internal.ServerNotifForwarder)1 WeakReference (java.lang.ref.WeakReference)1 Field (java.lang.reflect.Field)1 Method (java.lang.reflect.Method)1 HashMap (java.util.HashMap)1 Map (java.util.Map)1 Set (java.util.Set)1 AtomicInteger (java.util.concurrent.atomic.AtomicInteger)1 ListenerNotFoundException (javax.management.ListenerNotFoundException)1 MBeanServer (javax.management.MBeanServer)1 MBeanServerConnection (javax.management.MBeanServerConnection)1 Notification (javax.management.Notification)1 NotificationFilterSupport (javax.management.NotificationFilterSupport)1 ObjectName (javax.management.ObjectName)1 JMXConnector (javax.management.remote.JMXConnector)1 JMXServiceURL (javax.management.remote.JMXServiceURL)1 RMIConnectionImpl (javax.management.remote.rmi.RMIConnectionImpl)1 RMIConnectorServer (javax.management.remote.rmi.RMIConnectorServer)1