1 files changed, 100 insertions, 0 deletions
diff --git a/java/broker-plugins/management-jmx/src/main/java/org/apache/qpid/server/jmx/UsernameCachingRMIJRMPServer.java b/java/broker-plugins/management-jmx/src/main/java/org/apache/qpid/server/jmx/UsernameCachingRMIJRMPServer.java
new file mode 100644
index 0000000000..838e9e5664
--- /dev/null
+++ b/java/broker-plugins/management-jmx/src/main/java/org/apache/qpid/server/jmx/UsernameCachingRMIJRMPServer.java
@@ -0,0 +1,100 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.server.jmx;
+
+import static javax.management.remote.JMXConnectionNotification.CLOSED;
+import static javax.management.remote.JMXConnectionNotification.FAILED;
+
+import java.io.IOException;
+import java.rmi.server.RMIClientSocketFactory;
+import java.rmi.server.RMIServerSocketFactory;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import javax.management.Notification;
+import javax.management.NotificationFilter;
+import javax.management.NotificationListener;
+import javax.management.remote.JMXConnectionNotification;
+import javax.management.remote.JMXConnectorServer;
+import javax.management.remote.rmi.RMIConnection;
+import javax.management.remote.rmi.RMIJRMPServerImpl;
+import javax.security.auth.Subject;
+
+import org.apache.qpid.server.security.auth.AuthenticatedPrincipal;
+
+/**
+ * An implementation of RMIJRMPServerImpl that caches the usernames of users as they log-on
+ * and makes the same available via {@link UsernameAccessor#getUsernameForConnectionId(String)}.
+ *
+ * Caller is responsible for installing this object as a {@link NotificationListener} of the
+ * {@link JMXConnectorServer} so the cache entries are removed as the clients disconnect.
+ *
+ */
+public class UsernameCachingRMIJRMPServer extends RMIJRMPServerImpl implements NotificationListener, NotificationFilter, UsernameAccessor
+{
+    // ConnectionId is guaranteed to be unique per client connection, according to the JMX spec.
+    private final Map<String, String> _connectionIdUsernameMap = new ConcurrentHashMap<String, String>();
+
+    UsernameCachingRMIJRMPServer(int port, RMIClientSocketFactory csf, RMIServerSocketFactory ssf,
+            Map<String, ?> env) throws IOException
+    {
+        super(port, csf, ssf, env);
+    }
+
+    @Override
+    protected RMIConnection makeClient(String connectionId, Subject subject) throws IOException
+    {
+        final RMIConnection makeClient = super.makeClient(connectionId, subject);
+        final AuthenticatedPrincipal authenticatedPrincipalFromSubject = AuthenticatedPrincipal.getAuthenticatedPrincipalFromSubject(subject);
+        _connectionIdUsernameMap.put(connectionId, authenticatedPrincipalFromSubject.getName());
+        return makeClient;
+    }
+
+    @Override
+    public String getUsernameForConnectionId(String connectionId)
+    {
+        return _connectionIdUsernameMap.get(connectionId);
+    }
+
+    @Override
+    public void handleNotification(Notification notification, Object handback)
+    {
+        final String connectionId = ((JMXConnectionNotification) notification).getConnectionId();
+        removeConnectionIdFromCache(connectionId);
+    }
+
+     @Override
+    public boolean isNotificationEnabled(Notification notification)
+    {
+        return isClientDisconnectEvent(notification);
+    }
+
+     private void removeConnectionIdFromCache(String connectionId)
+     {
+         _connectionIdUsernameMap.remove(connectionId);
+     }
+
+    private boolean isClientDisconnectEvent(Notification notification)
+    {
+        final String type = notification.getType();
+        return CLOSED.equals(type) || FAILED.equals(type);
+    }
+
+}
+\ No newline at end of file