* Rewrote ClientManager to remove Lindenisms from OpenSim core, improve performance by removing locks, and replace LLUDPClientCollection

* Removed the confusing (and LL-specific) shutdowncircuit parameter from IClientAPI.Close()
* Updated the LLUDP code to only use ClientManager instead of trying to synchronize ClientManager and m_clients
* Remove clients asynchronously since it is a very slow operation (including a 2000ms sleep)

4 files changed, 107 insertions, 271 deletions

diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
index bc9cfcf..86d0112 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
@@ -403,39 +403,35 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         #region Client Methods
 
         /// <summary>
-        /// Close down the client view.  This *must* be the last method called, since the last  #
-        /// statement of CloseCleanup() aborts the thread.
+        /// Shut down the client view
         /// </summary>
-        /// <param name="shutdownCircuit"></param>
-        public void Close(bool shutdownCircuit)
+        public void Close()
         {
             m_log.DebugFormat(
-                "[CLIENT]: Close has been called with shutdownCircuit = {0} for {1} attached to scene {2}",
-                shutdownCircuit, Name, m_scene.RegionInfo.RegionName);
+                "[CLIENT]: Close has been called for {0} attached to scene {1}",
+                Name, m_scene.RegionInfo.RegionName);
+
+            // Remove ourselves from the scene
+            m_scene.ClientManager.Remove(m_agentId, m_udpClient.RemoteEndPoint);
 
             if (m_imageManager != null)
+            {
                 m_imageManager.Close();
+                m_imageManager = null;
+            }
 
             if (m_udpServer != null)
-                m_udpServer.Flush();
-
-            // raise an event on the packet server to Shutdown the circuit
-            // Now, if we raise the event then the packet server will call this method itself, so don't try cleanup
-            // here otherwise we'll end up calling it twice.
-            // FIXME: In truth, I might be wrong but this whole business of calling this method twice (with different args) looks
-            // horribly tangly.  Hopefully it should be possible to greatly simplify it.
-            if (shutdownCircuit)
             {
-                if (OnConnectionClosed != null)
-                    OnConnectionClosed(this);
-            }
-            else
-            {
-                CloseCleanup(shutdownCircuit);
+                m_udpServer.Flush();
             }
+
+            if (OnConnectionClosed != null)
+                OnConnectionClosed(this);
+
+            CloseCleanup();
         }
 
-        private void CloseCleanup(bool shutdownCircuit)
+        private void CloseCleanup()
         {
             m_scene.RemoveClient(AgentId);
 
@@ -459,43 +455,18 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 lock (m_primFullUpdateTimer)
                     m_primFullUpdateTimer.Stop();
 
-            // This is just to give the client a reasonable chance of
-            // flushing out all it's packets.  There should probably
-            // be a better mechanism here
-
             // We can't reach into other scenes and close the connection
             // We need to do this over grid communications
             //m_scene.CloseAllAgents(CircuitCode);
 
-            // If we're not shutting down the circuit, then this is the last time we'll go here.
-            // If we are shutting down the circuit, the UDP Server will come back here with
-            // ShutDownCircuit = false
-            if (!(shutdownCircuit))
-            {
-                GC.Collect();
-                m_imageManager = null;
-                // Sends a KillPacket object, with which, the
-                // blockingqueue dequeues and sees it's a killpacket
-                // and terminates within the context of the client thread.
-                // This ensures that it's done from within the context
-                // of the client thread regardless of where Close() is called.
-                KillEndDone();
-            }
-
             IsActive = false;
 
-            m_avatarTerseUpdateTimer.Close();
-            m_primTerseUpdateTimer.Close();
-            m_primFullUpdateTimer.Close();
+            m_avatarTerseUpdateTimer.Dispose();
+            m_primTerseUpdateTimer.Dispose();
+            m_primFullUpdateTimer.Dispose();
 
-            //m_udpServer.OnPacketStats -= PopulateStats;
+            // Disable UDP handling for this client
             m_udpClient.Shutdown();
-
-            // wait for thread stoped
-            // m_clientThread.Join();
-
-            // delete circuit code
-            //m_networkServer.CloseClient(this);
         }
 
         public void Kick(string message)
@@ -10225,7 +10196,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         public void KillEndDone()
         {
-            m_udpClient.Shutdown();
         }
 
         #region IClientCore
@@ -10268,15 +10238,14 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         {
             Kick(reason);
             Thread.Sleep(1000);
-            Close(true);
+            Close();
         }
 
         public void Disconnect()
         {
-            Close(true);
+            Close();
         }
 
-
         #endregion
 
         public void RefreshGroupMembership()
diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs b/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs
index 10e22d5..e5b2594 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs
@@ -181,7 +181,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// </summary>
         public void Shutdown()
         {
-            // TODO: Do we need to invalidate the circuit?
             IsConnected = false;
         }
 
diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLUDPClientCollection.cs b/OpenSim/Region/ClientStack/LindenUDP/LLUDPClientCollection.cs
deleted file mode 100644
index 4f375e4..0000000
--- a/OpenSim/Region/ClientStack/LindenUDP/LLUDPClientCollection.cs
+++ /dev/null
@@ -1,137 +0,0 @@
-/*
- * Copyright (c) Contributors, http://opensimulator.org/
- * See CONTRIBUTORS.TXT for a full list of copyright holders.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in the
- *       documentation and/or other materials provided with the distribution.
- *     * Neither the name of the OpenSimulator Project nor the
- *       names of its contributors may be used to endorse or promote products
- *       derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-using System;
-using System.Collections.Generic;
-using System.Net;
-using OpenSim.Framework;
-using OpenMetaverse;
-using BclExtras.Collections;
-
-using ReaderWriterLockImpl = OpenMetaverse.ReaderWriterLockSlim;
-
-namespace OpenSim.Region.ClientStack.LindenUDP
-{
-    /// <summary>
-    /// A thread safe mapping from endpoints to client references
-    /// </summary>
-    public sealed class UDPClientCollection
-    {
-        #region IComparers
-
-        private sealed class IPEndPointComparer : IComparer<IPEndPoint>
-        {
-            public int Compare(IPEndPoint x, IPEndPoint y)
-            {
-                int result = x.Address.Address.CompareTo(y.Address.Address);
-                if (result == 0) result = x.Port.CompareTo(y.Port);
-                return result;
-            }
-        }
-
-        #endregion IComparers
-
-        /// <summary>An immutable dictionary mapping from <seealso cref="IPEndPoint"/>
-        /// to <seealso cref="LLUDPClient"/> references</summary>
-        private ImmutableMap<IPEndPoint, LLUDPClient> m_dict;
-        /// <summary>Immutability grants thread safety for concurrent reads and
-        /// read-writes, but not concurrent writes</summary>
-        private object m_writeLock = new object();
-
-        /// <summary>Number of clients in the collection</summary>
-        public int Count { get { return m_dict.Count; } }
-
-        /// <summary>
-        /// Default constructor
-        /// </summary>
-        public UDPClientCollection()
-        {
-            m_dict = new ImmutableMap<IPEndPoint, LLUDPClient>(new IPEndPointComparer());
-        }
-
-        /// <summary>
-        /// Add a client reference to the collection
-        /// </summary>
-        /// <param name="key">Remote endpoint of the client</param>
-        /// <param name="value">Reference to the client object</param>
-        public void Add(IPEndPoint key, LLUDPClient value)
-        {
-            lock (m_writeLock)
-                m_dict = m_dict.Add(key, value);
-        }
-
-        /// <summary>
-        /// Remove a client from the collection
-        /// </summary>
-        /// <param name="key">Remote endpoint of the client</param>
-        public void Remove(IPEndPoint key)
-        {
-            lock (m_writeLock)
-                m_dict = m_dict.Delete(key);
-        }
-
-        /// <summary>
-        /// Resets the client collection
-        /// </summary>
-        public void Clear()
-        {
-            lock (m_writeLock)
-                m_dict = new ImmutableMap<IPEndPoint, LLUDPClient>(new IPEndPointComparer());
-        }
-
-        /// <summary>
-        /// Checks if an endpoint is in the collection
-        /// </summary>
-        /// <param name="key">Endpoint to check for</param>
-        /// <returns>True if the endpoint was found in the collection, otherwise false</returns>
-        public bool ContainsKey(IPEndPoint key)
-        {
-            return m_dict.ContainsKey(key);
-        }
-
-        /// <summary>
-        /// Attempts to fetch a value out of the collection
-        /// </summary>
-        /// <param name="key">Endpoint of the client to retrieve</param>
-        /// <param name="value">Retrieved client, or null on lookup failure</param>
-        /// <returns>True if the lookup succeeded, otherwise false</returns>
-        public bool TryGetValue(IPEndPoint key, out LLUDPClient value)
-        {
-            return m_dict.TryGetValue(key, out value);
-        }
-
-        /// <summary>
-        /// Performs a given task in parallel for each of the elements in the
-        /// collection
-        /// </summary>
-        /// <param name="action">Action to perform on each element</param>
-        public void ForEach(Action<LLUDPClient> action)
-        {
-            Parallel.ForEach<LLUDPClient>(m_dict.Values, action);
-        }
-    }
-}
diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
index 04c9cb1..8ec143a 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
@@ -96,7 +96,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <summary>Incoming packets that are awaiting handling</summary>
         private OpenMetaverse.BlockingQueue<IncomingPacket> packetInbox = new OpenMetaverse.BlockingQueue<IncomingPacket>();
         /// <summary></summary>
-        private UDPClientCollection m_clients = new UDPClientCollection();
+        //private UDPClientCollection m_clients = new UDPClientCollection();
         /// <summary>Bandwidth throttle for this UDP server</summary>
         private TokenBucket m_throttle;
         /// <summary>Bandwidth throttle rates for this UDP server</summary>
@@ -181,23 +181,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             return x == m_location;
         }
 
-        public void RemoveClient(LLUDPClient udpClient)
-        {
-            m_log.Debug("[LLUDPSERVER]: Removing LLUDPClient for " + udpClient.AgentID);
-
-            // Shut down the IClientAPI and remove it from the scene
-            IClientAPI client;
-            if (m_scene.ClientManager.TryGetClient(udpClient.CircuitCode, out client))
-            {
-                client.Close(false);
-                m_scene.ClientManager.Remove(udpClient.CircuitCode);
-            }
-            
-            // Shut down the LLUDPClient and remove it from the list of UDP clients
-            udpClient.Shutdown();
-            m_clients.Remove(udpClient.RemoteEndPoint);
-        }
-
         public void BroadcastPacket(Packet packet, ThrottleOutPacketType category, bool sendToPausedAgents, bool allowSplitting)
         {
             // CoarseLocationUpdate packets cannot be split in an automated way
@@ -215,17 +198,25 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 for (int i = 0; i < packetCount; i++)
                 {
                     byte[] data = datas[i];
-                    m_clients.ForEach(
-                        delegate(LLUDPClient client)
-                        { SendPacketData(client, data, packet.Type, category); });
+                    m_scene.ClientManager.ForEach(
+                        delegate(IClientAPI client)
+                        {
+                            if (client is LLClientView)
+                                SendPacketData(((LLClientView)client).UDPClient, data, packet.Type, category);
+                        }
+                    );
                 }
             }
             else
             {
                 byte[] data = packet.ToBytes();
-                m_clients.ForEach(
-                    delegate(LLUDPClient client)
-                    { SendPacketData(client, data, packet.Type, category); });
+                m_scene.ClientManager.ForEach(
+                    delegate(IClientAPI client)
+                    {
+                        if (client is LLClientView)
+                            SendPacketData(((LLClientView)client).UDPClient, data, packet.Type, category);
+                    }
+                );
             }
         }
 
@@ -475,7 +466,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             //try { Thread.CurrentThread.Name = "PacketReceived (" + m_scene.RegionInfo.RegionName + ")"; }
             //catch (Exception) { }
 
-            LLUDPClient client = null;
+            LLUDPClient udpClient = null;
             Packet packet = null;
             int packetEnd = buffer.DataLength - 1;
             IPEndPoint address = (IPEndPoint)buffer.RemoteEndPoint;
@@ -512,30 +503,33 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
 
             // Determine which agent this packet came from
-            if (!m_clients.TryGetValue(address, out client))
+            IClientAPI client;
+            if (!m_scene.ClientManager.TryGetValue(address, out client) || !(client is LLClientView))
             {
                 m_log.Warn("[LLUDPSERVER]: Received a " + packet.Type + " packet from an unrecognized source: " + address +
-                    " in " + m_scene.RegionInfo.RegionName + ", currently tracking " + m_clients.Count + " clients");
+                    " in " + m_scene.RegionInfo.RegionName + ", currently tracking " + m_scene.ClientManager.Count + " clients");
                 return;
             }
 
+            udpClient = ((LLClientView)client).UDPClient;
+
             #endregion Packet to Client Mapping
 
             // Stats tracking
-            Interlocked.Increment(ref client.PacketsReceived);
+            Interlocked.Increment(ref udpClient.PacketsReceived);
 
             #region ACK Receiving
 
             int now = Environment.TickCount;
-            client.TickLastPacketReceived = now;
+            udpClient.TickLastPacketReceived = now;
 
             // Handle appended ACKs
             if (packet.Header.AppendedAcks && packet.Header.AckList != null)
             {
-                lock (client.NeedAcks.SyncRoot)
+                lock (udpClient.NeedAcks.SyncRoot)
                 {
                     for (int i = 0; i < packet.Header.AckList.Length; i++)
-                        AcknowledgePacket(client, packet.Header.AckList[i], now, packet.Header.Resent);
+                        AcknowledgePacket(udpClient, packet.Header.AckList[i], now, packet.Header.Resent);
                 }
             }
 
@@ -544,10 +538,10 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             {
                 PacketAckPacket ackPacket = (PacketAckPacket)packet;
 
-                lock (client.NeedAcks.SyncRoot)
+                lock (udpClient.NeedAcks.SyncRoot)
                 {
                     for (int i = 0; i < ackPacket.Packets.Length; i++)
-                        AcknowledgePacket(client, ackPacket.Packets[i].ID, now, packet.Header.Resent);
+                        AcknowledgePacket(udpClient, ackPacket.Packets[i].ID, now, packet.Header.Resent);
                 }
             }
 
@@ -556,27 +550,27 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             #region ACK Sending
 
             if (packet.Header.Reliable)
-                client.PendingAcks.Enqueue(packet.Header.Sequence);
+                udpClient.PendingAcks.Enqueue(packet.Header.Sequence);
 
             // This is a somewhat odd sequence of steps to pull the client.BytesSinceLastACK value out,
             // add the current received bytes to it, test if 2*MTU bytes have been sent, if so remove
             // 2*MTU bytes from the value and send ACKs, and finally add the local value back to
             // client.BytesSinceLastACK. Lockless thread safety
-            int bytesSinceLastACK = Interlocked.Exchange(ref client.BytesSinceLastACK, 0);
+            int bytesSinceLastACK = Interlocked.Exchange(ref udpClient.BytesSinceLastACK, 0);
             bytesSinceLastACK += buffer.DataLength;
             if (bytesSinceLastACK > Packet.MTU * 2)
             {
                 bytesSinceLastACK -= Packet.MTU * 2;
-                SendAcks(client);
+                SendAcks(udpClient);
             }
-            Interlocked.Add(ref client.BytesSinceLastACK, bytesSinceLastACK);
+            Interlocked.Add(ref udpClient.BytesSinceLastACK, bytesSinceLastACK);
 
             #endregion ACK Sending
 
             #region Incoming Packet Accounting
 
             // Check the archive of received reliable packet IDs to see whether we already received this packet
-            if (packet.Header.Reliable && !client.PacketArchive.TryEnqueue(packet.Header.Sequence))
+            if (packet.Header.Reliable && !udpClient.PacketArchive.TryEnqueue(packet.Header.Sequence))
             {
                 if (packet.Header.Resent)
                     m_log.Debug("[LLUDPSERVER]: Received a resend of already processed packet #" + packet.Header.Sequence + ", type: " + packet.Type);
@@ -593,7 +587,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             if (packet.Type != PacketType.PacketAck)
             {
                 // Inbox insertion
-                packetInbox.Enqueue(new IncomingPacket(client, packet));
+                packetInbox.Enqueue(new IncomingPacket(udpClient, packet));
             }
         }
 
@@ -613,31 +607,23 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         private void AddNewClient(UseCircuitCodePacket useCircuitCode, IPEndPoint remoteEndPoint)
         {
+            UUID agentID = useCircuitCode.CircuitCode.ID;
+            UUID sessionID = useCircuitCode.CircuitCode.SessionID;
+            uint circuitCode = useCircuitCode.CircuitCode.Code;
+
             if (m_scene.RegionStatus != RegionStatus.SlaveScene)
             {
-                if (!m_clients.ContainsKey(remoteEndPoint))
+                AuthenticateResponse sessionInfo;
+                if (IsClientAuthorized(useCircuitCode, out sessionInfo))
                 {
-                    AuthenticateResponse sessionInfo;
-                    if (IsClientAuthorized(useCircuitCode, out sessionInfo))
-                    {
-                        UUID agentID = useCircuitCode.CircuitCode.ID;
-                        UUID sessionID = useCircuitCode.CircuitCode.SessionID;
-                        uint circuitCode = useCircuitCode.CircuitCode.Code;
-
-                        AddClient(circuitCode, agentID, sessionID, remoteEndPoint, sessionInfo);
-                    }
-                    else
-                    {
-                        // Don't create circuits for unauthorized clients
-                        m_log.WarnFormat(
-                            "[LLUDPSERVER]: Connection request for client {0} connecting with unnotified circuit code {1} from {2}",
-                            useCircuitCode.CircuitCode.ID, useCircuitCode.CircuitCode.Code, remoteEndPoint);
-                    }
+                    AddClient(circuitCode, agentID, sessionID, remoteEndPoint, sessionInfo);
                 }
                 else
                 {
-                    // Ignore repeated UseCircuitCode packets
-                    m_log.Debug("[LLUDPSERVER]: Ignoring UseCircuitCode for already established circuit " + useCircuitCode.CircuitCode.Code);
+                    // Don't create circuits for unauthorized clients
+                    m_log.WarnFormat(
+                        "[LLUDPSERVER]: Connection request for client {0} connecting with unnotified circuit code {1} from {2}",
+                        useCircuitCode.CircuitCode.ID, useCircuitCode.CircuitCode.Code, remoteEndPoint);
                 }
             }
             else
@@ -652,17 +638,31 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             // Create the LLUDPClient
             LLUDPClient udpClient = new LLUDPClient(this, m_throttleRates, m_throttle, circuitCode, agentID, remoteEndPoint);
 
-            // Create the LLClientView
-            LLClientView clientApi = new LLClientView(remoteEndPoint, m_scene, this, udpClient, sessionInfo, agentID, sessionID, circuitCode);
-            clientApi.OnLogout += LogoutHandler;
-            clientApi.OnConnectionClosed += ConnectionClosedHandler;
+            if (!m_scene.ClientManager.ContainsKey(agentID))
+            {
+                // Create the LLClientView
+                LLClientView client = new LLClientView(remoteEndPoint, m_scene, this, udpClient, sessionInfo, agentID, sessionID, circuitCode);
+                client.OnLogout += LogoutHandler;
+                client.OnConnectionClosed += ConnectionClosedHandler;
 
-            // Start the IClientAPI
-            m_scene.ClientManager.Add(circuitCode, clientApi);
-            clientApi.Start();
+                m_scene.ClientManager.Add(agentID, remoteEndPoint, client);
 
-            // Add the new client to our list of tracked clients
-            m_clients.Add(udpClient.RemoteEndPoint, udpClient);
+                // Start the IClientAPI
+                m_scene.ClientManager.Add(agentID, remoteEndPoint, client);
+                client.Start();
+            }
+            else
+            {
+                m_log.Debug("[LLUDPSERVER]: Ignoring a repeated UseCircuitCode from " + udpClient.AgentID);
+            }
+        }
+
+        private void RemoveClient(LLUDPClient udpClient)
+        {
+            // Remove this client from the scene ClientManager
+            IClientAPI client;
+            if (m_scene.ClientManager.TryGetValue(udpClient.AgentID, out client))
+                Util.FireAndForget(delegate(object o) { client.Close(); });
         }
 
         private void AcknowledgePacket(LLUDPClient client, uint ack, int currentTime, bool fromResend)
@@ -740,20 +740,25 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     elapsed500MS = 0;
                 }
 
-                m_clients.ForEach(
-                    delegate(LLUDPClient client)
+                m_scene.ClientManager.ForEach(
+                    delegate(IClientAPI client)
                     {
-                        if (client.DequeueOutgoing())
-                            packetSent = true;
-                        if (resendUnacked)
-                            ResendUnacked(client);
-                        if (sendAcks)
+                        if (client is LLClientView)
                         {
-                            SendAcks(client);
-                            client.SendPacketStats();
+                            LLUDPClient udpClient = ((LLClientView)client).UDPClient;
+
+                            if (udpClient.DequeueOutgoing())
+                                packetSent = true;
+                            if (resendUnacked)
+                                ResendUnacked(udpClient);
+                            if (sendAcks)
+                            {
+                                SendAcks(udpClient);
+                                udpClient.SendPacketStats();
+                            }
+                            if (sendPings)
+                                SendPing(udpClient);
                         }
-                        if (sendPings)
-                            SendPing(client);
                     }
                 );
 
@@ -777,7 +782,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
 
             // Make sure this client is still alive
-            if (m_scene.ClientManager.TryGetClient(udpClient.CircuitCode, out client))
+            if (m_scene.ClientManager.TryGetValue(udpClient.AgentID, out client))
             {
                 try
                 {