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From tab...@apache.org
Subject svn commit: r1327710 - /activemq/activemq-dotnet/Apache.NMS.ActiveMQ/branches/1.5.x/src/main/csharp/Connection.cs
Date Wed, 18 Apr 2012 22:32:36 GMT
Author: tabish
Date: Wed Apr 18 22:32:36 2012
New Revision: 1327710

URL: http://svn.apache.org/viewvc?rev=1327710&view=rev
Log:
fix for: https://issues.apache.org/jira/browse/AMQNET-377

Modified:
    activemq/activemq-dotnet/Apache.NMS.ActiveMQ/branches/1.5.x/src/main/csharp/Connection.cs

Modified: activemq/activemq-dotnet/Apache.NMS.ActiveMQ/branches/1.5.x/src/main/csharp/Connection.cs
URL: http://svn.apache.org/viewvc/activemq/activemq-dotnet/Apache.NMS.ActiveMQ/branches/1.5.x/src/main/csharp/Connection.cs?rev=1327710&r1=1327709&r2=1327710&view=diff
==============================================================================
--- activemq/activemq-dotnet/Apache.NMS.ActiveMQ/branches/1.5.x/src/main/csharp/Connection.cs (original)
+++ activemq/activemq-dotnet/Apache.NMS.ActiveMQ/branches/1.5.x/src/main/csharp/Connection.cs Wed Apr 18 22:32:36 2012
@@ -29,1270 +29,1270 @@ using Apache.NMS.Util;
 
 namespace Apache.NMS.ActiveMQ
 {
-	/// <summary>
-	/// Represents a connection with a message broker
-	/// </summary>
-	public class Connection : IConnection
-	{
-		private static readonly IdGenerator CONNECTION_ID_GENERATOR = new IdGenerator();
-
-		// Uri configurable options.
-		private AcknowledgementMode acknowledgementMode = AcknowledgementMode.AutoAcknowledge;
-		private bool asyncSend = false;
-		private bool alwaysSyncSend = false;
-		private bool asyncClose = true;
-		private bool useCompression = false;
-		private bool copyMessageOnSend = true;
-		private bool sendAcksAsync = false;
-		private bool dispatchAsync = true;
-		private int producerWindowSize = 0;
-		private bool messagePrioritySupported = true;
-		private bool watchTopicAdviosires = true;
-
-		private bool userSpecifiedClientID;
-		private readonly Uri brokerUri;
-		private ITransport transport;
-		private readonly ConnectionInfo info;
-		private TimeSpan requestTimeout; // from connection factory
-		private BrokerInfo brokerInfo; // from broker
-		private readonly CountDownLatch brokerInfoReceived = new CountDownLatch(1);
-		private WireFormatInfo brokerWireFormatInfo; // from broker
-		private readonly IList sessions = ArrayList.Synchronized(new ArrayList());
-		private readonly IDictionary producers = Hashtable.Synchronized(new Hashtable());
-		private readonly IDictionary dispatchers = Hashtable.Synchronized(new Hashtable());
-		private readonly IDictionary tempDests = Hashtable.Synchronized(new Hashtable());
-		private readonly object myLock = new object();
-		private readonly Atomic<bool> connected = new Atomic<bool>(false);
-		private readonly Atomic<bool> closed = new Atomic<bool>(false);
-		private readonly Atomic<bool> closing = new Atomic<bool>(false);
-		private readonly Atomic<bool> transportFailed = new Atomic<bool>(false);
-		private Exception firstFailureError = null;
-		private int sessionCounter = 0;
-		private int temporaryDestinationCounter = 0;
-		private int localTransactionCounter;
-		private readonly Atomic<bool> started = new Atomic<bool>(false);
-		private ConnectionMetaData metaData = null;
-		private bool disposed = false;
-		private IRedeliveryPolicy redeliveryPolicy;
-		private PrefetchPolicy prefetchPolicy = new PrefetchPolicy();
-		private ICompressionPolicy compressionPolicy = new CompressionPolicy();
-		private readonly IdGenerator clientIdGenerator;
-		private int consumerIdCounter = 0;
-		private volatile CountDownLatch transportInterruptionProcessingComplete;
-		private readonly MessageTransformation messageTransformation;
-		private readonly ThreadPoolExecutor executor = new ThreadPoolExecutor();
-		private AdvisoryConsumer advisoryConsumer = null;
-
-		public Connection(Uri connectionUri, ITransport transport, IdGenerator clientIdGenerator)
-		{
-			this.brokerUri = connectionUri;
-			this.clientIdGenerator = clientIdGenerator;
-
-			this.transport = transport;
-			this.transport.Command = new CommandHandler(OnCommand);
-			this.transport.Exception = new ExceptionHandler(OnTransportException);
-			this.transport.Interrupted = new InterruptedHandler(OnTransportInterrupted);
-			this.transport.Resumed = new ResumedHandler(OnTransportResumed);
-
-			ConnectionId id = new ConnectionId();
-			id.Value = CONNECTION_ID_GENERATOR.GenerateId();
-
-			this.info = new ConnectionInfo();
-			this.info.ConnectionId = id;
-			this.info.FaultTolerant = transport.IsFaultTolerant;
-
-			this.messageTransformation = new ActiveMQMessageTransformation(this);
-		}
-
-		~Connection()
-		{
-			Dispose(false);
-		}
-
-		/// <summary>
-		/// A delegate that can receive transport level exceptions.
-		/// </summary>
-		public event ExceptionListener ExceptionListener;
-
-		/// <summary>
-		/// An asynchronous listener that is notified when a Fault tolerant connection
-		/// has been interrupted.
-		/// </summary>
-		public event ConnectionInterruptedListener ConnectionInterruptedListener;
-
-		/// <summary>
-		/// An asynchronous listener that is notified when a Fault tolerant connection
-		/// has been resumed.
-		/// </summary>
-		public event ConnectionResumedListener ConnectionResumedListener;
-
-		private ConsumerTransformerDelegate consumerTransformer;
-		public ConsumerTransformerDelegate ConsumerTransformer
-		{
-			get { return this.consumerTransformer; }
-			set { this.consumerTransformer = value; }
-		}
-
-		private ProducerTransformerDelegate producerTransformer;
-		public ProducerTransformerDelegate ProducerTransformer
-		{
-			get { return this.producerTransformer; }
-			set { this.producerTransformer = value; }
-		}
-
-		#region Properties
-
-		public String UserName
-		{
-			get { return this.info.UserName; }
-			set { this.info.UserName = value; }
-		}
-
-		public String Password
-		{
-			get { return this.info.Password; }
-			set { this.info.Password = value; }
-		}
-
-		/// <summary>
-		/// This property indicates what version of the Protocol we are using to
-		/// communicate with the Broker, if not set we return the lowest version
-		/// number to indicate we support only the basic command set.
-		/// </summary>
-		public int ProtocolVersion
-		{
-			get
-			{
-				if(brokerWireFormatInfo != null)
-				{
-					return brokerWireFormatInfo.Version;
-				}
-
-				return 1;
-			}
-		}
-
-		/// <summary>
-		/// This property indicates whether or not async send is enabled.
-		/// </summary>
-		public bool AsyncSend
-		{
-			get { return asyncSend; }
-			set { asyncSend = value; }
-		}
-
-		/// <summary>
-		/// This property indicates whether or not async close is enabled.
-		/// When the connection is closed, it will either send a synchronous
-		/// DisposeOf command to the broker and wait for confirmation (if true),
-		/// or it will send the DisposeOf command asynchronously.
-		/// </summary>
-		public bool AsyncClose
-		{
-			get { return asyncClose; }
-			set { asyncClose = value; }
-		}
-
-		/// <summary>
-		/// This property indicates whether or not async sends are used for
-		/// message acknowledgement messages.  Sending Acks async can improve
-		/// performance but may decrease reliability.
-		/// </summary>
-		public bool SendAcksAsync
-		{
-			get { return sendAcksAsync; }
-			set { sendAcksAsync = value; }
-		}
-
-		/// <summary>
-		/// This property sets the acknowledgment mode for the connection.
-		/// The URI parameter connection.ackmode can be set to a string value
-		/// that maps to the enumeration value.
-		/// </summary>
-		public string AckMode
-		{
-			set { this.acknowledgementMode = NMSConvert.ToAcknowledgementMode(value); }
-		}
-
-		/// <summary>
-		/// This property is the maximum number of bytes in memory that a producer will transmit
-		/// to a broker before waiting for acknowledgement messages from the broker that it has
-		/// accepted the previously sent messages. In other words, this how you configure the
-		/// producer flow control window that is used for async sends where the client is responsible
-		/// for managing memory usage. The default value of 0 means no flow control at the client
-		/// </summary>
-		public int ProducerWindowSize
-		{
-			get { return producerWindowSize; }
-			set { producerWindowSize = value; }
-		}
-
-		/// <summary>
-		/// This property forces all messages that are sent to be sent synchronously overriding
-		/// any usage of the AsyncSend flag. This can reduce performance in some cases since the
-		/// only messages we normally send synchronously are Persistent messages not sent in a
-		/// transaction. This options guarantees that no send will return until the broker has
-		/// acknowledge receipt of the message
-		/// </summary>
-		public bool AlwaysSyncSend
-		{
-			get { return alwaysSyncSend; }
-			set { alwaysSyncSend = value; }
-		}
-
-		/// <summary>
-		/// This property indicates whether Message's should be copied before being sent via
-		/// one of the Connection's send methods.  Copying the Message object allows the user
-		/// to resuse the Object over for another send.  If the message isn't copied performance
-		/// can improve but the user must not reuse the Object as it may not have been sent
-		/// before they reset its payload.
-		/// </summary>
-		public bool CopyMessageOnSend
-		{
-			get { return copyMessageOnSend; }
-			set { copyMessageOnSend = value; }
-		}
-
-		/// <summary>
-		/// Enable or Disable the use of Compression on Message bodies.  When enabled all
-		/// messages have their body compressed using the Deflate compression algorithm.
-		/// The recipient of the message must support the use of message compression as well
-		/// otherwise the receiving client will receive a message whose body appears in the
-		/// compressed form.
-		/// </summary>
-		public bool UseCompression
-		{
-			get { return this.useCompression; }
-			set { this.useCompression = value; }
-		}
-
-		/// <summary>
-		/// Indicate whether or not the resources of this Connection should support the
-		/// Message Priority value of incoming messages and dispatch them accordingly.
-		/// When disabled Message are always dispatched to Consumers in FIFO order.
-		/// </summary>
-		public bool MessagePrioritySupported
-		{
-			get { return this.messagePrioritySupported; }
-			set { this.messagePrioritySupported = value; }
-		}
-
-		public IConnectionMetaData MetaData
-		{
-			get { return this.metaData ?? (this.metaData = new ConnectionMetaData()); }
-		}
-
-		public Uri BrokerUri
-		{
-			get { return brokerUri; }
-		}
-
-		public ITransport ITransport
-		{
-			get { return transport; }
-			set { this.transport = value; }
-		}
-
-		public bool TransportFailed
-		{
-			get { return this.transportFailed.Value; }
-		}
-
-		public Exception FirstFailureError
-		{
-			get { return this.firstFailureError; }
-		}
-
-		public TimeSpan RequestTimeout
-		{
-			get { return this.requestTimeout; }
-			set { this.requestTimeout = value; }
-		}
-
-		public AcknowledgementMode AcknowledgementMode
-		{
-			get { return acknowledgementMode; }
-			set { this.acknowledgementMode = value; }
-		}
-
-		/// <summary>
-		/// synchronously or asynchronously by the broker.
-		/// </summary>
-		public bool DispatchAsync
-		{
-			get { return this.dispatchAsync; }
-			set { this.dispatchAsync = value; }
-		}
-
-		public bool WatchTopicAdvisories
-		{
-			get { return this.watchTopicAdviosires; }
-			set { this.watchTopicAdviosires = value; }
-		}
-
-		public string ClientId
-		{
-			get { return info.ClientId; }
-			set
-			{
-				if(this.connected.Value)
-				{
-					throw new NMSException("You cannot change the ClientId once the Connection is connected");
-				}
-
-				this.info.ClientId = value;
-				this.userSpecifiedClientID = true;
-				CheckConnected();
-			}
-		}
-
-		/// <summary>
-		/// The Default Client Id used if the ClientId property is not set explicity.
-		/// </summary>
-		public string DefaultClientId
-		{
-			set
-			{
-				this.info.ClientId = value;
-				this.userSpecifiedClientID = true;
-			}
-		}
-
-		public ConnectionId ConnectionId
-		{
-			get { return info.ConnectionId; }
-		}
-
-		public BrokerInfo BrokerInfo
-		{
-			get { return brokerInfo; }
-		}
-
-		public WireFormatInfo BrokerWireFormat
-		{
-			get { return brokerWireFormatInfo; }
-		}
-
-		public String ResourceManagerId
-		{
-			get
-			{
-				this.brokerInfoReceived.await();
-				return brokerInfo.BrokerId.Value;
-			}
-		}
-
-		/// <summary>
-		/// Get/or set the redelivery policy for this connection.
-		/// </summary>
-		public IRedeliveryPolicy RedeliveryPolicy
-		{
-			get { return this.redeliveryPolicy; }
-			set { this.redeliveryPolicy = value; }
-		}
-
-		public PrefetchPolicy PrefetchPolicy
-		{
-			get { return this.prefetchPolicy; }
-			set { this.prefetchPolicy = value; }
-		}
-
-		public ICompressionPolicy CompressionPolicy
-		{
-			get { return this.compressionPolicy; }
-			set { this.compressionPolicy = value; }
-		}
-
-		internal MessageTransformation MessageTransformation
-		{
-			get { return this.messageTransformation; }
-		}
-
-		#endregion
-
-		/// <summary>
-		/// Starts asynchronous message delivery of incoming messages for this connection.
-		/// Synchronous delivery is unaffected.
-		/// </summary>
-		public void Start()
-		{
-			CheckConnected();
-			if(started.CompareAndSet(false, true))
-			{
-				lock(sessions.SyncRoot)
-				{
-					foreach(Session session in sessions)
-					{
-						session.Start();
-					}
-				}
-			}
-		}
-
-		/// <summary>
-		/// This property determines if the asynchronous message delivery of incoming
-		/// messages has been started for this connection.
-		/// </summary>
-		public bool IsStarted
-		{
-			get { return started.Value; }
-		}
-
-		/// <summary>
-		/// Temporarily stop asynchronous delivery of inbound messages for this connection.
-		/// The sending of outbound messages is unaffected.
-		/// </summary>
-		public void Stop()
-		{
-			if(started.CompareAndSet(true, false))
-			{
-				lock(sessions.SyncRoot)
-				{
-					foreach(Session session in sessions)
-					{
-						session.Stop();
-					}
-				}
-			}
-		}
-
-		/// <summary>
-		/// Creates a new session to work on this connection
-		/// </summary>
-		public ISession CreateSession()
-		{
-			return CreateAtiveMQSession(acknowledgementMode);
-		}
-
-		/// <summary>
-		/// Creates a new session to work on this connection
-		/// </summary>
-		public ISession CreateSession(AcknowledgementMode sessionAcknowledgementMode)
-		{
-			return CreateAtiveMQSession(sessionAcknowledgementMode);
-		}
-
-		protected virtual Session CreateAtiveMQSession(AcknowledgementMode ackMode)
-		{
-			CheckConnected();
-			return new Session(this, NextSessionId, ackMode);
-		}
-
-		internal void AddSession(Session session)
-		{
-			if(!this.closing.Value)
-			{
-				sessions.Add(session);
-			}
-		}
-
-		internal void RemoveSession(Session session)
-		{
-			if(!this.closing.Value)
-			{
-				sessions.Remove(session);
-			}
-		}
-
-		internal void addDispatcher(ConsumerId id, IDispatcher dispatcher)
-		{
-			if(!this.closing.Value)
-			{
-				this.dispatchers.Add(id, dispatcher);
-			}
-		}
-
-		internal void removeDispatcher(ConsumerId id)
-		{
-			if(!this.closing.Value)
-			{
-				this.dispatchers.Remove(id);
-			}
-		}
-
-		internal void addProducer(ProducerId id, MessageProducer producer)
-		{
-			if(!this.closing.Value)
-			{
-				this.producers.Add(id, producer);
-			}
-		}
-
-		internal void removeProducer(ProducerId id)
-		{
-			if(!this.closing.Value)
-			{
-				this.producers.Remove(id);
-			}
-		}
-
-		public void Close()
-		{
-			if(!this.closed.Value && !transportFailed.Value)
-			{
-				this.Stop();
-			}
-
-			lock(myLock)
-			{
-				if(this.closed.Value)
-				{
-					return;
-				}
-
-				try
-				{
-					Tracer.InfoFormat("Connection[{0}]: Closing Connection Now.", this.ConnectionId);
-					this.closing.Value = true;
-
-					if(this.advisoryConsumer != null)
-					{
-						this.advisoryConsumer.Dispose();
-						this.advisoryConsumer = null;
-					}
-
-					lock(sessions.SyncRoot)
-					{
-						foreach(Session session in sessions)
-						{
-							session.Shutdown();
-						}
-					}
-					sessions.Clear();
-
-					if(this.tempDests.Count > 0)
-					{
-						// Make a copy of the destinations to delete, because the act of deleting
-						// them will modify the collection.
-						ActiveMQTempDestination[] tempDestsToDelete = new ActiveMQTempDestination[this.tempDests.Count];
-
-						this.tempDests.Values.CopyTo(tempDestsToDelete, 0);
-						foreach(ActiveMQTempDestination dest in tempDestsToDelete)
-						{
-							dest.Delete();
-						}
-					}
-
-					// Connected is true only when we've successfully sent our ConnectionInfo
-					// to the broker, so if we haven't announced ourselves there's no need to
-					// inform the broker of a remove, and if the transport is failed, why bother.
-					if(connected.Value && !transportFailed.Value)
-					{
-						DisposeOf(ConnectionId);
-						ShutdownInfo shutdowninfo = new ShutdownInfo();
-						transport.Oneway(shutdowninfo);
-					}
-
-					executor.Shutdown();
-
-					Tracer.DebugFormat("Connection[{0}]: Disposing of the Transport.", this.ConnectionId);
-					transport.Dispose();
-				}
-				catch(Exception ex)
-				{
-					Tracer.ErrorFormat("Connection[{0}]: Error during connection close: {1}", ConnectionId, ex);
-				}
-				finally
-				{
-					if(executor != null)
-					{
-						executor.Shutdown();
-					}
-
-					this.transport = null;
-					this.closed.Value = true;
-					this.connected.Value = false;
-					this.closing.Value = false;
-				}
-			}
-		}
-
-		public void Dispose()
-		{
-			Dispose(true);
-			GC.SuppressFinalize(this);
-		}
-
-		protected void Dispose(bool disposing)
-		{
-			if(disposed)
-			{
-				return;
-			}
-
-			if(disposing)
-			{
-				// Dispose managed code here.
-			}
-
-			try
-			{
-				Close();
-			}
-			catch
-			{
-				// Ignore network errors.
-			}
-
-			disposed = true;
-		}
-
-		// Implementation methods
-
-		/// <summary>
-		/// Performs a synchronous request-response with the broker
-		/// </summary>
-		///
-		public Response SyncRequest(Command command)
-		{
-			return SyncRequest(command, this.RequestTimeout);
-		}
-
-		/// <summary>
-		/// Performs a synchronous request-response with the broker for requested timeout duration.
-		/// </summary>
-		/// <param name="command"></param>
-		/// <param name="requestTimeout"></param>
-		/// <returns></returns>
-		public Response SyncRequest(Command command, TimeSpan requestTimeout)
-		{
-			CheckConnected();
-
-			try
-			{
-				Response response = transport.Request(command, requestTimeout);
-				if(response is ExceptionResponse)
-				{
-					ExceptionResponse exceptionResponse = (ExceptionResponse)response;
-					BrokerError brokerError = exceptionResponse.Exception;
-					throw new BrokerException(brokerError);
-				}
-				return response;
-			}
-			catch(Exception ex)
-			{
-				throw NMSExceptionSupport.Create(ex);
-			}
-		}
-
-		public void Oneway(Command command)
-		{
-			CheckConnected();
-
-			try
-			{
-				transport.Oneway(command);
-			}
-			catch(Exception ex)
-			{
-				throw NMSExceptionSupport.Create(ex);
-			}
-		}
-
-		private void DisposeOf(DataStructure objectId)
-		{
-			try
-			{
-				RemoveInfo command = new RemoveInfo();
-				command.ObjectId = objectId;
-				if(asyncClose)
-				{
-					Tracer.DebugFormat("Connection[{0}]: Asynchronously disposing of Connection.", this.ConnectionId);
-					if(connected.Value)
-					{
-						transport.Oneway(command);
-						if (Tracer.IsDebugEnabled)
-						{
-							Tracer.DebugFormat("Connection[{0}]: Oneway command sent to broker: {1}", 
-								               this.ConnectionId, command);
-						}
-					}
-				}
-				else
-				{
-					// Ensure that the object is disposed to avoid potential race-conditions
-					// of trying to re-create the same object in the broker faster than
-					// the broker can dispose of the object.  Allow up to 5 seconds to process.
-					Tracer.DebugFormat("Connection[{0}]: Synchronously disposing of Connection.", this.ConnectionId);
-					SyncRequest(command, TimeSpan.FromSeconds(5));
-					Tracer.DebugFormat("Connection[{0}]: Synchronously closed of Connection.", this.ConnectionId);
-				}
-			}
-			catch // (BrokerException)
-			{
-				// Ignore exceptions while shutting down.
-			}
-		}
-
-		private object checkConnectedLock = new object();
-
-		/// <summary>
-		/// Check and ensure that the connection objcet is connected.  If it is not
-		/// connected or is closed, a ConnectionClosedException is thrown.
-		/// </summary>
-		internal void CheckConnected()
-		{
-			if(closed.Value)
-			{
-				throw new ConnectionClosedException();
-			}
-
-			if(!connected.Value)
-			{
-				DateTime timeoutTime = DateTime.Now + this.RequestTimeout;
-				int waitCount = 1;
-
-				while(true)
-				{
-					if(Monitor.TryEnter(checkConnectedLock))
-					{
-						try
-						{
-							if(!connected.Value)
-							{
-								if(!this.userSpecifiedClientID)
-								{
-									this.info.ClientId = this.clientIdGenerator.GenerateId();
-								}
-
-								try
-								{
-									if(null != transport)
-									{
-										// Send the connection and see if an ack/nak is returned.
-										Response response = transport.Request(this.info, this.RequestTimeout);
-										if(!(response is ExceptionResponse))
-										{
-											connected.Value = true;
-											if(this.watchTopicAdviosires)
-											{
-												ConsumerId id = new ConsumerId(
-													new SessionId(info.ConnectionId, -1),
-													Interlocked.Increment(ref this.consumerIdCounter));
-												this.advisoryConsumer = new AdvisoryConsumer(this, id);
-											}
-										}
-									}
-								}
-								catch
-								{
-								}
-							}
-						}
-						finally
-						{
-							Monitor.Exit(checkConnectedLock);
-						}
-					}
-
-					if(connected.Value || DateTime.Now > timeoutTime)
-					{
-						break;
-					}
-
-					// Back off from being overly aggressive.  Having too many threads
-					// aggressively trying to connect to a down broker pegs the CPU.
-					Thread.Sleep(5 * (waitCount++));
-				}
-
-				if(!connected.Value)
-				{
-					throw new ConnectionClosedException();
-				}
-			}
-		}
-
-		/// <summary>
-		/// Handle incoming commands
-		/// </summary>
-		/// <param name="commandTransport">An ITransport</param>
-		/// <param name="command">A  Command</param>
-		protected void OnCommand(ITransport commandTransport, Command command)
-		{
-			if(command.IsMessageDispatch)
-			{
-				WaitForTransportInterruptionProcessingToComplete();
-				DispatchMessage((MessageDispatch)command);
-			}
-			else if(command.IsKeepAliveInfo)
-			{
-				OnKeepAliveCommand(commandTransport, (KeepAliveInfo)command);
-			}
-			else if(command.IsWireFormatInfo)
-			{
-				this.brokerWireFormatInfo = (WireFormatInfo)command;
-			}
-			else if(command.IsBrokerInfo)
-			{
-				this.brokerInfo = (BrokerInfo)command;
-				this.brokerInfoReceived.countDown();
-			}
-			else if(command.IsShutdownInfo)
-			{
-				// Only terminate the connection if the transport we use is not fault
-				// tolerant otherwise we let the transport deal with the broker closing
-				// our connection and deal with IOException if it is sent to use.
-				if(!closing.Value && !closed.Value && this.transport != null && !this.transport.IsFaultTolerant)
-				{
-					OnException(new NMSException("Broker closed this connection via Shutdown command."));
-				}
-			}
-			else if(command.IsProducerAck)
-			{
-				ProducerAck ack = (ProducerAck)command as ProducerAck;
-				if(ack.ProducerId != null)
-				{
-					MessageProducer producer = producers[ack.ProducerId] as MessageProducer;
-					if(producer != null)
-					{
-						if(Tracer.IsDebugEnabled)
-						{
-							Tracer.DebugFormat("Connection[{0}]: Received a new ProducerAck -> ", 
-							                   this.ConnectionId, ack);
-						}
-
-						producer.OnProducerAck(ack);
-					}
-				}
-			}
-			else if(command.IsConnectionError)
-			{
-				if(!closing.Value && !closed.Value)
-				{
-					ConnectionError connectionError = (ConnectionError)command;
-					BrokerError brokerError = connectionError.Exception;
-					string message = "Broker connection error.";
-					string cause = "";
-
-					if(null != brokerError)
-					{
-						message = brokerError.Message;
-						if(null != brokerError.Cause)
-						{
-							cause = brokerError.Cause.Message;
-						}
-					}
-
-					Tracer.ErrorFormat("Connection[{0}]: ConnectionError: " + message + " : " + cause, this.ConnectionId);
-					OnException(new NMSConnectionException(message, cause));
-				}
-			}
-			else
-			{
-				Tracer.ErrorFormat("Connection[{0}]: Unknown command: " + command, this.ConnectionId);
-			}
-		}
-
-		protected void DispatchMessage(MessageDispatch dispatch)
-		{
-			lock(dispatchers.SyncRoot)
-			{
-				if(dispatchers.Contains(dispatch.ConsumerId))
-				{
-					IDispatcher dispatcher = (IDispatcher)dispatchers[dispatch.ConsumerId];
-
-					// Can be null when a consumer has sent a MessagePull and there was
-					// no available message at the broker to dispatch or when signalled
-					// that the end of a Queue browse has been reached.
-					if(dispatch.Message != null)
-					{
-						dispatch.Message.ReadOnlyBody = true;
-						dispatch.Message.ReadOnlyProperties = true;
-						dispatch.Message.RedeliveryCounter = dispatch.RedeliveryCounter;
-					}
-
-					dispatcher.Dispatch(dispatch);
-
-					return;
-				}
-			}
-
-			Tracer.ErrorFormat("Connection[{0}]: No such consumer active: " + dispatch.ConsumerId, this.ConnectionId);
-		}
-
-		protected void OnKeepAliveCommand(ITransport commandTransport, KeepAliveInfo info)
-		{
-			try
-			{
-				if (connected.Value)
-				{
-					info.ResponseRequired = false;
-					transport.Oneway(info);
-				}
-			}
-			catch(Exception ex)
-			{
-				if(!closing.Value && !closed.Value)
-				{
-					OnException(ex);
-				}
-			}
-		}
-
-		internal void OnAsyncException(Exception error)
-		{
-			if(!this.closed.Value && !this.closing.Value)
-			{
-				if(this.ExceptionListener != null)
-				{
-					if(!(error is NMSException))
-					{
-						error = NMSExceptionSupport.Create(error);
-					}
-					NMSException e = (NMSException)error;
-
-					// Called in another thread so that processing can continue
-					// here, ensures no lock contention.
-					executor.QueueUserWorkItem(AsyncCallExceptionListener, e);
-				}
-				else
-				{
-					Tracer.DebugFormat("Connection[{0}]: Async exception with no exception listener: " + error, this.ConnectionId);
-				}
-			}
-		}
-
-		private void AsyncCallExceptionListener(object error)
-		{
-			NMSException exception = error as NMSException;
-			this.ExceptionListener(exception);
-		}
-
-		internal void OnTransportException(ITransport source, Exception cause)
-		{
-			this.OnException(cause);
-		}
-
-		internal void OnException(Exception error)
-		{
-			// Will fire an exception listener callback if there's any set.
-			OnAsyncException(error);
-
-			if(!this.closing.Value && !this.closed.Value)
-			{
-				// Perform the actual work in another thread to avoid lock contention
-				// and allow the caller to continue on in its error cleanup.
-				executor.QueueUserWorkItem(AsyncOnExceptionHandler, error);
-			}
-		}
-
-		private void AsyncOnExceptionHandler(object error)
-		{
-			Exception cause = error as Exception;
-
-			MarkTransportFailed(cause);
-
-			try
-			{
-				this.transport.Dispose();
-			}
-			catch(Exception ex)
-			{
-				Tracer.DebugFormat("Connection[{0}]: Caught Exception While disposing of Transport: " + ex, this.ConnectionId);
-			}
-
-			this.brokerInfoReceived.countDown();
-
-			IList sessionsCopy = null;
-			lock(this.sessions.SyncRoot)
-			{
-				sessionsCopy = new ArrayList(this.sessions);
-			}
-
-			// Use a copy so we don't concurrently modify the Sessions list if the
-			// client is closing at the same time.
-			foreach(Session session in sessionsCopy)
-			{
-				try
-				{
-					session.Shutdown();
-				}
-				catch(Exception ex)
-				{
-					Tracer.DebugFormat("Connection[{0}]: Caught Exception While disposing of Sessions: " + ex, this.ConnectionId);
-				}
-			}
-		}
-
-		private void MarkTransportFailed(Exception error)
-		{
-			this.transportFailed.Value = true;
-			if(this.firstFailureError == null)
-			{
-				this.firstFailureError = error;
-			}
-		}
-
-		protected void OnTransportInterrupted(ITransport sender)
-		{
-			Tracer.Debug("Connection: Transport has been Interrupted.");
-
-			// Ensure that if there's an advisory consumer we don't add it to the
-			// set of consumers that need interruption processing.
-			this.transportInterruptionProcessingComplete =
-				new CountDownLatch(dispatchers.Count - (this.advisoryConsumer != null ? 1 : 0));
-
-			if(Tracer.IsDebugEnabled)
-			{
-				Tracer.DebugFormat("Connection[{0}]: Transport interrupted, dispatchers: " + dispatchers.Count, this.ConnectionId);
-			}
-
-			SignalInterruptionProcessingNeeded();
-
-			foreach(Session session in this.sessions)
-			{
-				try
-				{
-					session.ClearMessagesInProgress();
-				}
-				catch(Exception ex)
-				{
-					Tracer.WarnFormat("Connection[{0}]: Exception while clearing messages: " + ex.Message, this.ConnectionId);
-					Tracer.Warn(ex.StackTrace);
-				}
-			}
-
-			if(this.ConnectionInterruptedListener != null && !this.closing.Value)
-			{
-				try
-				{
-					this.ConnectionInterruptedListener();
-				}
-				catch
-				{
-				}
-			}
-		}
-
-		protected void OnTransportResumed(ITransport sender)
-		{
-			Tracer.Debug("Transport has resumed normal operation.");
-
-			if(this.ConnectionResumedListener != null && !this.closing.Value)
-			{
-				try
-				{
-					this.ConnectionResumedListener();
-				}
-				catch
-				{
-				}
-			}
-		}
-
-		internal void OnSessionException(Session sender, Exception exception)
-		{
-			if(ExceptionListener != null)
-			{
-				try
-				{
-					ExceptionListener(exception);
-				}
-				catch
-				{
-					sender.Close();
-				}
-			}
-		}
-
-		/// <summary>
-		/// Creates a new local transaction ID
-		/// </summary>
-		public LocalTransactionId CreateLocalTransactionId()
-		{
-			LocalTransactionId id = new LocalTransactionId();
-			id.ConnectionId = ConnectionId;
-			id.Value = Interlocked.Increment(ref localTransactionCounter);
-			return id;
-		}
-
-		protected SessionId NextSessionId
-		{
-			get { return new SessionId(this.info.ConnectionId, Interlocked.Increment(ref this.sessionCounter)); }
-		}
-
-		public ActiveMQTempDestination CreateTemporaryDestination(bool topic)
-		{
-			ActiveMQTempDestination destination = null;
-
-			if(topic)
-			{
-				destination = new ActiveMQTempTopic(
-					info.ConnectionId.Value + ":" + Interlocked.Increment(ref temporaryDestinationCounter));
-			}
-			else
-			{
-				destination = new ActiveMQTempQueue(
-					info.ConnectionId.Value + ":" + Interlocked.Increment(ref temporaryDestinationCounter));
-			}
-
-			DestinationInfo command = new DestinationInfo();
-			command.ConnectionId = ConnectionId;
-			command.OperationType = DestinationInfo.ADD_OPERATION_TYPE; // 0 is add
-			command.Destination = destination;
-
-			this.SyncRequest(command);
-
-			destination = this.AddTempDestination(destination);
-			destination.Connection = this;
-
-			return destination;
-		}
-
-		protected void CreateTemporaryDestination(ActiveMQDestination tempDestination)
-		{
-		}
-
-		public void DeleteTemporaryDestination(IDestination destination)
-		{
-			CheckClosedOrFailed();
-
-			ActiveMQTempDestination temp = destination as ActiveMQTempDestination;
-
-			foreach(Session session in this.sessions)
-			{
-				if(session.IsInUse(temp))
-				{
-					throw new NMSException("A consumer is consuming from the temporary destination");
-				}
-			}
-
-			this.tempDests.Remove(destination as ActiveMQTempDestination);
-			this.DeleteDestination(destination);
-		}
-
-		public void DeleteDestination(IDestination destination)
-		{
-			DestinationInfo command = new DestinationInfo();
-			command.ConnectionId = this.ConnectionId;
-			command.OperationType = DestinationInfo.REMOVE_OPERATION_TYPE; // 1 is remove
-			command.Destination = (ActiveMQDestination)destination;
-
-			this.Oneway(command);
-		}
-
-		private void WaitForTransportInterruptionProcessingToComplete()
-		{
-			CountDownLatch cdl = this.transportInterruptionProcessingComplete;
-			if(cdl != null)
-			{
-				if(!closed.Value && cdl.Remaining > 0)
-				{
-					Tracer.WarnFormat("Connection[{0}]: Dispatch paused, waiting for outstanding dispatch interruption " +
-									  "processing (" + cdl.Remaining + ") to complete..", this.ConnectionId);
-					cdl.await(TimeSpan.FromSeconds(10));
-				}
-
-				SignalInterruptionProcessingComplete();
-			}
-		}
-
-		internal void TransportInterruptionProcessingComplete()
-		{
-			CountDownLatch cdl = this.transportInterruptionProcessingComplete;
-			if(cdl != null)
-			{
-				cdl.countDown();
-				try
-				{
-					SignalInterruptionProcessingComplete();
-				}
-				catch
-				{
-				}
-			}
-		}
-
-		private void SignalInterruptionProcessingComplete()
-		{
-			CountDownLatch cdl = this.transportInterruptionProcessingComplete;
-			if(cdl.Remaining == 0)
-			{
-				if(Tracer.IsDebugEnabled)
-				{
-					Tracer.DebugFormat("Connection[{0}]: transportInterruptionProcessingComplete.", this.info.ConnectionId);
-				}
-
-				this.transportInterruptionProcessingComplete = null;
-
-				FailoverTransport failoverTransport = transport.Narrow(typeof(FailoverTransport)) as FailoverTransport;
-				if(failoverTransport != null)
-				{
-					failoverTransport.ConnectionInterruptProcessingComplete(this.info.ConnectionId);
-					if(Tracer.IsDebugEnabled)
-					{
-						Tracer.DebugFormat("Connection[{0}]: notified failover transport (" + failoverTransport +
-									 	   ") of interruption completion.", this.ConnectionId);
-					}
-				}
-			}
-		}
-
-		private void SignalInterruptionProcessingNeeded()
-		{
-			FailoverTransport failoverTransport = transport.Narrow(typeof(FailoverTransport)) as FailoverTransport;
-
-			if(failoverTransport != null)
-			{
-				failoverTransport.StateTracker.TransportInterrupted(this.info.ConnectionId);
-				if(Tracer.IsDebugEnabled)
-				{
-					Tracer.DebugFormat("Connection[{0}]: notified failover transport (" + failoverTransport +
-								 	   ") of pending interruption processing.", this.ConnectionId);
-				}
-			}
-		}
-
-		internal ActiveMQTempDestination AddTempDestination(ActiveMQTempDestination dest)
-		{
-			ActiveMQTempDestination addedDest = dest;
-
-			// .NET lacks a putIfAbsent operation for Maps.
-			lock(tempDests.SyncRoot)
-			{
-				if(!this.tempDests.Contains(dest))
-				{
-					this.tempDests.Add(dest, dest);
-				}
-				else
-				{
-					addedDest = this.tempDests[dest] as ActiveMQTempDestination;
-				}
-			}
-
-			return addedDest;
-		}
-
-		internal void RemoveTempDestination(ActiveMQTempDestination dest)
-		{
-			this.tempDests.Remove(dest);
-		}
-
-		internal bool IsTempDestinationActive(ActiveMQTempDestination dest)
-		{
-			if(this.advisoryConsumer == null)
-			{
-				return true;
-			}
-
-			return this.tempDests.Contains(dest);
-		}
-
-		protected void CheckClosedOrFailed()
-		{
-			CheckClosed();
-			if(transportFailed.Value)
-			{
-				throw new ConnectionFailedException(firstFailureError.Message);
-			}
-		}
-
-		protected void CheckClosed()
-		{
-			if(closed.Value)
-			{
-				throw new ConnectionClosedException();
-			}
-		}
-	}
+    /// <summary>
+    /// Represents a connection with a message broker
+    /// </summary>
+    public class Connection : IConnection
+    {
+        private static readonly IdGenerator CONNECTION_ID_GENERATOR = new IdGenerator();
+
+        // Uri configurable options.
+        private AcknowledgementMode acknowledgementMode = AcknowledgementMode.AutoAcknowledge;
+        private bool asyncSend = false;
+        private bool alwaysSyncSend = false;
+        private bool asyncClose = true;
+        private bool useCompression = false;
+        private bool copyMessageOnSend = true;
+        private bool sendAcksAsync = false;
+        private bool dispatchAsync = true;
+        private int producerWindowSize = 0;
+        private bool messagePrioritySupported = true;
+        private bool watchTopicAdviosires = true;
+
+        private bool userSpecifiedClientID;
+        private readonly Uri brokerUri;
+        private ITransport transport;
+        private readonly ConnectionInfo info;
+        private TimeSpan requestTimeout; // from connection factory
+        private BrokerInfo brokerInfo; // from broker
+        private readonly CountDownLatch brokerInfoReceived = new CountDownLatch(1);
+        private WireFormatInfo brokerWireFormatInfo; // from broker
+        private readonly IList sessions = ArrayList.Synchronized(new ArrayList());
+        private readonly IDictionary producers = Hashtable.Synchronized(new Hashtable());
+        private readonly IDictionary dispatchers = Hashtable.Synchronized(new Hashtable());
+        private readonly IDictionary tempDests = Hashtable.Synchronized(new Hashtable());
+        private readonly object myLock = new object();
+        private readonly Atomic<bool> connected = new Atomic<bool>(false);
+        private readonly Atomic<bool> closed = new Atomic<bool>(false);
+        private readonly Atomic<bool> closing = new Atomic<bool>(false);
+        private readonly Atomic<bool> transportFailed = new Atomic<bool>(false);
+        private Exception firstFailureError = null;
+        private int sessionCounter = 0;
+        private int temporaryDestinationCounter = 0;
+        private int localTransactionCounter;
+        private readonly Atomic<bool> started = new Atomic<bool>(false);
+        private ConnectionMetaData metaData = null;
+        private bool disposed = false;
+        private IRedeliveryPolicy redeliveryPolicy;
+        private PrefetchPolicy prefetchPolicy = new PrefetchPolicy();
+        private ICompressionPolicy compressionPolicy = new CompressionPolicy();
+        private readonly IdGenerator clientIdGenerator;
+        private int consumerIdCounter = 0;
+        private volatile CountDownLatch transportInterruptionProcessingComplete;
+        private readonly MessageTransformation messageTransformation;
+        private readonly ThreadPoolExecutor executor = new ThreadPoolExecutor();
+        private AdvisoryConsumer advisoryConsumer = null;
+
+        public Connection(Uri connectionUri, ITransport transport, IdGenerator clientIdGenerator)
+        {
+            this.brokerUri = connectionUri;
+            this.clientIdGenerator = clientIdGenerator;
+
+            this.transport = transport;
+            this.transport.Command = new CommandHandler(OnCommand);
+            this.transport.Exception = new ExceptionHandler(OnTransportException);
+            this.transport.Interrupted = new InterruptedHandler(OnTransportInterrupted);
+            this.transport.Resumed = new ResumedHandler(OnTransportResumed);
+
+            ConnectionId id = new ConnectionId();
+            id.Value = CONNECTION_ID_GENERATOR.GenerateId();
+
+            this.info = new ConnectionInfo();
+            this.info.ConnectionId = id;
+            this.info.FaultTolerant = transport.IsFaultTolerant;
+
+            this.messageTransformation = new ActiveMQMessageTransformation(this);
+        }
+
+        ~Connection()
+        {
+            Dispose(false);
+        }
+
+        /// <summary>
+        /// A delegate that can receive transport level exceptions.
+        /// </summary>
+        public event ExceptionListener ExceptionListener;
+
+        /// <summary>
+        /// An asynchronous listener that is notified when a Fault tolerant connection
+        /// has been interrupted.
+        /// </summary>
+        public event ConnectionInterruptedListener ConnectionInterruptedListener;
+
+        /// <summary>
+        /// An asynchronous listener that is notified when a Fault tolerant connection
+        /// has been resumed.
+        /// </summary>
+        public event ConnectionResumedListener ConnectionResumedListener;
+
+        private ConsumerTransformerDelegate consumerTransformer;
+        public ConsumerTransformerDelegate ConsumerTransformer
+        {
+            get { return this.consumerTransformer; }
+            set { this.consumerTransformer = value; }
+        }
+
+        private ProducerTransformerDelegate producerTransformer;
+        public ProducerTransformerDelegate ProducerTransformer
+        {
+            get { return this.producerTransformer; }
+            set { this.producerTransformer = value; }
+        }
+
+        #region Properties
+
+        public String UserName
+        {
+            get { return this.info.UserName; }
+            set { this.info.UserName = value; }
+        }
+
+        public String Password
+        {
+            get { return this.info.Password; }
+            set { this.info.Password = value; }
+        }
+
+        /// <summary>
+        /// This property indicates what version of the Protocol we are using to
+        /// communicate with the Broker, if not set we return the lowest version
+        /// number to indicate we support only the basic command set.
+        /// </summary>
+        public int ProtocolVersion
+        {
+            get
+            {
+                if(brokerWireFormatInfo != null)
+                {
+                    return brokerWireFormatInfo.Version;
+                }
+
+                return 1;
+            }
+        }
+
+        /// <summary>
+        /// This property indicates whether or not async send is enabled.
+        /// </summary>
+        public bool AsyncSend
+        {
+            get { return asyncSend; }
+            set { asyncSend = value; }
+        }
+
+        /// <summary>
+        /// This property indicates whether or not async close is enabled.
+        /// When the connection is closed, it will either send a synchronous
+        /// DisposeOf command to the broker and wait for confirmation (if true),
+        /// or it will send the DisposeOf command asynchronously.
+        /// </summary>
+        public bool AsyncClose
+        {
+            get { return asyncClose; }
+            set { asyncClose = value; }
+        }
+
+        /// <summary>
+        /// This property indicates whether or not async sends are used for
+        /// message acknowledgement messages.  Sending Acks async can improve
+        /// performance but may decrease reliability.
+        /// </summary>
+        public bool SendAcksAsync
+        {
+            get { return sendAcksAsync; }
+            set { sendAcksAsync = value; }
+        }
+
+        /// <summary>
+        /// This property sets the acknowledgment mode for the connection.
+        /// The URI parameter connection.ackmode can be set to a string value
+        /// that maps to the enumeration value.
+        /// </summary>
+        public string AckMode
+        {
+            set { this.acknowledgementMode = NMSConvert.ToAcknowledgementMode(value); }
+        }
+
+        /// <summary>
+        /// This property is the maximum number of bytes in memory that a producer will transmit
+        /// to a broker before waiting for acknowledgement messages from the broker that it has
+        /// accepted the previously sent messages. In other words, this how you configure the
+        /// producer flow control window that is used for async sends where the client is responsible
+        /// for managing memory usage. The default value of 0 means no flow control at the client
+        /// </summary>
+        public int ProducerWindowSize
+        {
+            get { return producerWindowSize; }
+            set { producerWindowSize = value; }
+        }
+
+        /// <summary>
+        /// This property forces all messages that are sent to be sent synchronously overriding
+        /// any usage of the AsyncSend flag. This can reduce performance in some cases since the
+        /// only messages we normally send synchronously are Persistent messages not sent in a
+        /// transaction. This options guarantees that no send will return until the broker has
+        /// acknowledge receipt of the message
+        /// </summary>
+        public bool AlwaysSyncSend
+        {
+            get { return alwaysSyncSend; }
+            set { alwaysSyncSend = value; }
+        }
+
+        /// <summary>
+        /// This property indicates whether Message's should be copied before being sent via
+        /// one of the Connection's send methods.  Copying the Message object allows the user
+        /// to resuse the Object over for another send.  If the message isn't copied performance
+        /// can improve but the user must not reuse the Object as it may not have been sent
+        /// before they reset its payload.
+        /// </summary>
+        public bool CopyMessageOnSend
+        {
+            get { return copyMessageOnSend; }
+            set { copyMessageOnSend = value; }
+        }
+
+        /// <summary>
+        /// Enable or Disable the use of Compression on Message bodies.  When enabled all
+        /// messages have their body compressed using the Deflate compression algorithm.
+        /// The recipient of the message must support the use of message compression as well
+        /// otherwise the receiving client will receive a message whose body appears in the
+        /// compressed form.
+        /// </summary>
+        public bool UseCompression
+        {
+            get { return this.useCompression; }
+            set { this.useCompression = value; }
+        }
+
+        /// <summary>
+        /// Indicate whether or not the resources of this Connection should support the
+        /// Message Priority value of incoming messages and dispatch them accordingly.
+        /// When disabled Message are always dispatched to Consumers in FIFO order.
+        /// </summary>
+        public bool MessagePrioritySupported
+        {
+            get { return this.messagePrioritySupported; }
+            set { this.messagePrioritySupported = value; }
+        }
+
+        public IConnectionMetaData MetaData
+        {
+            get { return this.metaData ?? (this.metaData = new ConnectionMetaData()); }
+        }
+
+        public Uri BrokerUri
+        {
+            get { return brokerUri; }
+        }
+
+        public ITransport ITransport
+        {
+            get { return transport; }
+            set { this.transport = value; }
+        }
+
+        public bool TransportFailed
+        {
+            get { return this.transportFailed.Value; }
+        }
+
+        public Exception FirstFailureError
+        {
+            get { return this.firstFailureError; }
+        }
+
+        public TimeSpan RequestTimeout
+        {
+            get { return this.requestTimeout; }
+            set { this.requestTimeout = value; }
+        }
+
+        public AcknowledgementMode AcknowledgementMode
+        {
+            get { return acknowledgementMode; }
+            set { this.acknowledgementMode = value; }
+        }
+
+        /// <summary>
+        /// synchronously or asynchronously by the broker.
+        /// </summary>
+        public bool DispatchAsync
+        {
+            get { return this.dispatchAsync; }
+            set { this.dispatchAsync = value; }
+        }
+
+        public bool WatchTopicAdvisories
+        {
+            get { return this.watchTopicAdviosires; }
+            set { this.watchTopicAdviosires = value; }
+        }
+
+        public string ClientId
+        {
+            get { return info.ClientId; }
+            set
+            {
+                if(this.connected.Value)
+                {
+                    throw new NMSException("You cannot change the ClientId once the Connection is connected");
+                }
+
+                this.info.ClientId = value;
+                this.userSpecifiedClientID = true;
+                CheckConnected();
+            }
+        }
+
+        /// <summary>
+        /// The Default Client Id used if the ClientId property is not set explicity.
+        /// </summary>
+        public string DefaultClientId
+        {
+            set
+            {
+                this.info.ClientId = value;
+                this.userSpecifiedClientID = true;
+            }
+        }
+
+        public ConnectionId ConnectionId
+        {
+            get { return info.ConnectionId; }
+        }
+
+        public BrokerInfo BrokerInfo
+        {
+            get { return brokerInfo; }
+        }
+
+        public WireFormatInfo BrokerWireFormat
+        {
+            get { return brokerWireFormatInfo; }
+        }
+
+        public String ResourceManagerId
+        {
+            get
+            {
+                this.brokerInfoReceived.await();
+                return brokerInfo.BrokerId.Value;
+            }
+        }
+
+        /// <summary>
+        /// Get/or set the redelivery policy for this connection.
+        /// </summary>
+        public IRedeliveryPolicy RedeliveryPolicy
+        {
+            get { return this.redeliveryPolicy; }
+            set { this.redeliveryPolicy = value; }
+        }
+
+        public PrefetchPolicy PrefetchPolicy
+        {
+            get { return this.prefetchPolicy; }
+            set { this.prefetchPolicy = value; }
+        }
+
+        public ICompressionPolicy CompressionPolicy
+        {
+            get { return this.compressionPolicy; }
+            set { this.compressionPolicy = value; }
+        }
+
+        internal MessageTransformation MessageTransformation
+        {
+            get { return this.messageTransformation; }
+        }
+
+        #endregion
+
+        /// <summary>
+        /// Starts asynchronous message delivery of incoming messages for this connection.
+        /// Synchronous delivery is unaffected.
+        /// </summary>
+        public void Start()
+        {
+            CheckConnected();
+            if(started.CompareAndSet(false, true))
+            {
+                lock(sessions.SyncRoot)
+                {
+                    foreach(Session session in sessions)
+                    {
+                        session.Start();
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// This property determines if the asynchronous message delivery of incoming
+        /// messages has been started for this connection.
+        /// </summary>
+        public bool IsStarted
+        {
+            get { return started.Value; }
+        }
+
+        /// <summary>
+        /// Temporarily stop asynchronous delivery of inbound messages for this connection.
+        /// The sending of outbound messages is unaffected.
+        /// </summary>
+        public void Stop()
+        {
+            if(started.CompareAndSet(true, false))
+            {
+                lock(sessions.SyncRoot)
+                {
+                    foreach(Session session in sessions)
+                    {
+                        session.Stop();
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Creates a new session to work on this connection
+        /// </summary>
+        public ISession CreateSession()
+        {
+            return CreateAtiveMQSession(acknowledgementMode);
+        }
+
+        /// <summary>
+        /// Creates a new session to work on this connection
+        /// </summary>
+        public ISession CreateSession(AcknowledgementMode sessionAcknowledgementMode)
+        {
+            return CreateAtiveMQSession(sessionAcknowledgementMode);
+        }
+
+        protected virtual Session CreateAtiveMQSession(AcknowledgementMode ackMode)
+        {
+            CheckConnected();
+            return new Session(this, NextSessionId, ackMode);
+        }
+
+        internal void AddSession(Session session)
+        {
+            if(!this.closing.Value)
+            {
+                sessions.Add(session);
+            }
+        }
+
+        internal void RemoveSession(Session session)
+        {
+            if(!this.closing.Value)
+            {
+                sessions.Remove(session);
+            }
+        }
+
+        internal void addDispatcher(ConsumerId id, IDispatcher dispatcher)
+        {
+            if(!this.closing.Value)
+            {
+                this.dispatchers.Add(id, dispatcher);
+            }
+        }
+
+        internal void removeDispatcher(ConsumerId id)
+        {
+            if(!this.closing.Value)
+            {
+                this.dispatchers.Remove(id);
+            }
+        }
+
+        internal void addProducer(ProducerId id, MessageProducer producer)
+        {
+            if(!this.closing.Value)
+            {
+                this.producers.Add(id, producer);
+            }
+        }
+
+        internal void removeProducer(ProducerId id)
+        {
+            if(!this.closing.Value)
+            {
+                this.producers.Remove(id);
+            }
+        }
+
+        public void Close()
+        {
+            if(!this.closed.Value && !transportFailed.Value)
+            {
+                this.Stop();
+            }
+
+            lock(myLock)
+            {
+                if(this.closed.Value)
+                {
+                    return;
+                }
+
+                try
+                {
+                    Tracer.InfoFormat("Connection[{0}]: Closing Connection Now.", this.ConnectionId);
+                    this.closing.Value = true;
+
+                    if(this.advisoryConsumer != null)
+                    {
+                        this.advisoryConsumer.Dispose();
+                        this.advisoryConsumer = null;
+                    }
+
+                    lock(sessions.SyncRoot)
+                    {
+                        foreach(Session session in sessions)
+                        {
+                            session.Shutdown();
+                        }
+                    }
+                    sessions.Clear();
+
+                    if(this.tempDests.Count > 0)
+                    {
+                        // Make a copy of the destinations to delete, because the act of deleting
+                        // them will modify the collection.
+                        ActiveMQTempDestination[] tempDestsToDelete = new ActiveMQTempDestination[this.tempDests.Count];
+
+                        this.tempDests.Values.CopyTo(tempDestsToDelete, 0);
+                        foreach(ActiveMQTempDestination dest in tempDestsToDelete)
+                        {
+                            dest.Delete();
+                        }
+                    }
+
+                    // Connected is true only when we've successfully sent our ConnectionInfo
+                    // to the broker, so if we haven't announced ourselves there's no need to
+                    // inform the broker of a remove, and if the transport is failed, why bother.
+                    if(connected.Value && !transportFailed.Value)
+                    {
+                        DisposeOf(ConnectionId);
+                        ShutdownInfo shutdowninfo = new ShutdownInfo();
+                        transport.Oneway(shutdowninfo);
+                    }
+
+                    executor.Shutdown();
+
+                    Tracer.DebugFormat("Connection[{0}]: Disposing of the Transport.", this.ConnectionId);
+                    transport.Dispose();
+                }
+                catch(Exception ex)
+                {
+                    Tracer.ErrorFormat("Connection[{0}]: Error during connection close: {1}", ConnectionId, ex);
+                }
+                finally
+                {
+                    if(executor != null)
+                    {
+                        executor.Shutdown();
+                    }
+
+                    this.transport = null;
+                    this.closed.Value = true;
+                    this.connected.Value = false;
+                    this.closing.Value = false;
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected void Dispose(bool disposing)
+        {
+            if(disposed)
+            {
+                return;
+            }
+
+            if(disposing)
+            {
+                // Dispose managed code here.
+            }
+
+            try
+            {
+                Close();
+            }
+            catch
+            {
+                // Ignore network errors.
+            }
+
+            disposed = true;
+        }
+
+        // Implementation methods
+
+        /// <summary>
+        /// Performs a synchronous request-response with the broker
+        /// </summary>
+        ///
+        public Response SyncRequest(Command command)
+        {
+            return SyncRequest(command, this.RequestTimeout);
+        }
+
+        /// <summary>
+        /// Performs a synchronous request-response with the broker for requested timeout duration.
+        /// </summary>
+        /// <param name="command"></param>
+        /// <param name="requestTimeout"></param>
+        /// <returns></returns>
+        public Response SyncRequest(Command command, TimeSpan requestTimeout)
+        {
+            CheckConnected();
+
+            try
+            {
+                Response response = transport.Request(command, requestTimeout);
+                if(response is ExceptionResponse)
+                {
+                    ExceptionResponse exceptionResponse = (ExceptionResponse)response;
+                    BrokerError brokerError = exceptionResponse.Exception;
+                    throw new BrokerException(brokerError);
+                }
+                return response;
+            }
+            catch(Exception ex)
+            {
+                throw NMSExceptionSupport.Create(ex);
+            }
+        }
+
+        public void Oneway(Command command)
+        {
+            CheckConnected();
+
+            try
+            {
+                transport.Oneway(command);
+            }
+            catch(Exception ex)
+            {
+                throw NMSExceptionSupport.Create(ex);
+            }
+        }
+
+        private void DisposeOf(DataStructure objectId)
+        {
+            try
+            {
+                RemoveInfo command = new RemoveInfo();
+                command.ObjectId = objectId;
+                if(asyncClose)
+                {
+                    Tracer.DebugFormat("Connection[{0}]: Asynchronously disposing of Connection.", this.ConnectionId);
+                    if(connected.Value)
+                    {
+                        transport.Oneway(command);
+                        if (Tracer.IsDebugEnabled)
+                        {
+                            Tracer.DebugFormat("Connection[{0}]: Oneway command sent to broker: {1}",
+                                               this.ConnectionId, command);
+                        }
+                    }
+                }
+                else
+                {
+                    // Ensure that the object is disposed to avoid potential race-conditions
+                    // of trying to re-create the same object in the broker faster than
+                    // the broker can dispose of the object.  Allow up to 5 seconds to process.
+                    Tracer.DebugFormat("Connection[{0}]: Synchronously disposing of Connection.", this.ConnectionId);
+                    SyncRequest(command, TimeSpan.FromSeconds(5));
+                    Tracer.DebugFormat("Connection[{0}]: Synchronously closed of Connection.", this.ConnectionId);
+                }
+            }
+            catch // (BrokerException)
+            {
+                // Ignore exceptions while shutting down.
+            }
+        }
+
+        private object checkConnectedLock = new object();
+
+        /// <summary>
+        /// Check and ensure that the connection objcet is connected.  If it is not
+        /// connected or is closed, a ConnectionClosedException is thrown.
+        /// </summary>
+        internal void CheckConnected()
+        {
+            if(closed.Value)
+            {
+                throw new ConnectionClosedException();
+            }
+
+            if(!connected.Value)
+            {
+                DateTime timeoutTime = DateTime.Now + this.RequestTimeout;
+                int waitCount = 1;
+
+                while(true)
+                {
+                    if(Monitor.TryEnter(checkConnectedLock))
+                    {
+                        try
+                        {
+                            if(!connected.Value)
+                            {
+                                if(!this.userSpecifiedClientID)
+                                {
+                                    this.info.ClientId = this.clientIdGenerator.GenerateId();
+                                }
+
+                                try
+                                {
+                                    if(null != transport)
+                                    {
+                                        // Send the connection and see if an ack/nak is returned.
+                                        Response response = transport.Request(this.info, this.RequestTimeout);
+                                        if(!(response is ExceptionResponse))
+                                        {
+                                            connected.Value = true;
+                                            if(this.watchTopicAdviosires)
+                                            {
+                                                ConsumerId id = new ConsumerId(
+                                                    new SessionId(info.ConnectionId, -1),
+                                                    Interlocked.Increment(ref this.consumerIdCounter));
+                                                this.advisoryConsumer = new AdvisoryConsumer(this, id);
+                                            }
+                                        }
+                                    }
+                                }
+                                catch
+                                {
+                                }
+                            }
+                        }
+                        finally
+                        {
+                            Monitor.Exit(checkConnectedLock);
+                        }
+                    }
+
+                    if(connected.Value || DateTime.Now > timeoutTime)
+                    {
+                        break;
+                    }
+
+                    // Back off from being overly aggressive.  Having too many threads
+                    // aggressively trying to connect to a down broker pegs the CPU.
+                    Thread.Sleep(5 * (waitCount++));
+                }
+
+                if(!connected.Value)
+                {
+                    throw new ConnectionClosedException();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Handle incoming commands
+        /// </summary>
+        /// <param name="commandTransport">An ITransport</param>
+        /// <param name="command">A  Command</param>
+        protected void OnCommand(ITransport commandTransport, Command command)
+        {
+            if(command.IsMessageDispatch)
+            {
+                WaitForTransportInterruptionProcessingToComplete();
+                DispatchMessage((MessageDispatch)command);
+            }
+            else if(command.IsKeepAliveInfo)
+            {
+                OnKeepAliveCommand(commandTransport, (KeepAliveInfo)command);
+            }
+            else if(command.IsWireFormatInfo)
+            {
+                this.brokerWireFormatInfo = (WireFormatInfo)command;
+            }
+            else if(command.IsBrokerInfo)
+            {
+                this.brokerInfo = (BrokerInfo)command;
+                this.brokerInfoReceived.countDown();
+            }
+            else if(command.IsShutdownInfo)
+            {
+                // Only terminate the connection if the transport we use is not fault
+                // tolerant otherwise we let the transport deal with the broker closing
+                // our connection and deal with IOException if it is sent to use.
+                if(!closing.Value && !closed.Value && this.transport != null && !this.transport.IsFaultTolerant)
+                {
+                    OnException(new NMSException("Broker closed this connection via Shutdown command."));
+                }
+            }
+            else if(command.IsProducerAck)
+            {
+                ProducerAck ack = (ProducerAck)command as ProducerAck;
+                if(ack.ProducerId != null)
+                {
+                    MessageProducer producer = producers[ack.ProducerId] as MessageProducer;
+                    if(producer != null)
+                    {
+                        if(Tracer.IsDebugEnabled)
+                        {
+                            Tracer.DebugFormat("Connection[{0}]: Received a new ProducerAck -> ",
+                                               this.ConnectionId, ack);
+                        }
+
+                        producer.OnProducerAck(ack);
+                    }
+                }
+            }
+            else if(command.IsConnectionError)
+            {
+                if(!closing.Value && !closed.Value)
+                {
+                    ConnectionError connectionError = (ConnectionError)command;
+                    BrokerError brokerError = connectionError.Exception;
+                    string message = "Broker connection error.";
+                    string cause = "";
+
+                    if(null != brokerError)
+                    {
+                        message = brokerError.Message;
+                        if(null != brokerError.Cause)
+                        {
+                            cause = brokerError.Cause.Message;
+                        }
+                    }
+
+                    Tracer.ErrorFormat("Connection[{0}]: ConnectionError: " + message + " : " + cause, this.ConnectionId);
+                    OnAsyncException(new NMSConnectionException(message, cause));
+                }
+            }
+            else
+            {
+                Tracer.ErrorFormat("Connection[{0}]: Unknown command: " + command, this.ConnectionId);
+            }
+        }
+
+        protected void DispatchMessage(MessageDispatch dispatch)
+        {
+            lock(dispatchers.SyncRoot)
+            {
+                if(dispatchers.Contains(dispatch.ConsumerId))
+                {
+                    IDispatcher dispatcher = (IDispatcher)dispatchers[dispatch.ConsumerId];
+
+                    // Can be null when a consumer has sent a MessagePull and there was
+                    // no available message at the broker to dispatch or when signalled
+                    // that the end of a Queue browse has been reached.
+                    if(dispatch.Message != null)
+                    {
+                        dispatch.Message.ReadOnlyBody = true;
+                        dispatch.Message.ReadOnlyProperties = true;
+                        dispatch.Message.RedeliveryCounter = dispatch.RedeliveryCounter;
+                    }
+
+                    dispatcher.Dispatch(dispatch);
+
+                    return;
+                }
+            }
+
+            Tracer.ErrorFormat("Connection[{0}]: No such consumer active: " + dispatch.ConsumerId, this.ConnectionId);
+        }
+
+        protected void OnKeepAliveCommand(ITransport commandTransport, KeepAliveInfo info)
+        {
+            try
+            {
+                if (connected.Value)
+                {
+                    info.ResponseRequired = false;
+                    transport.Oneway(info);
+                }
+            }
+            catch(Exception ex)
+            {
+                if(!closing.Value && !closed.Value)
+                {
+                    OnException(ex);
+                }
+            }
+        }
+
+        internal void OnAsyncException(Exception error)
+        {
+            if(!this.closed.Value && !this.closing.Value)
+            {
+                if(this.ExceptionListener != null)
+                {
+                    if(!(error is NMSException))
+                    {
+                        error = NMSExceptionSupport.Create(error);
+                    }
+                    NMSException e = (NMSException)error;
+
+                    // Called in another thread so that processing can continue
+                    // here, ensures no lock contention.
+                    executor.QueueUserWorkItem(AsyncCallExceptionListener, e);
+                }
+                else
+                {
+                    Tracer.DebugFormat("Connection[{0}]: Async exception with no exception listener: " + error, this.ConnectionId);
+                }
+            }
+        }
+
+        private void AsyncCallExceptionListener(object error)
+        {
+            NMSException exception = error as NMSException;
+            this.ExceptionListener(exception);
+        }
+
+        internal void OnTransportException(ITransport source, Exception cause)
+        {
+            this.OnException(cause);
+        }
+
+        internal void OnException(Exception error)
+        {
+            // Will fire an exception listener callback if there's any set.
+            OnAsyncException(error);
+
+            if(!this.closing.Value && !this.closed.Value)
+            {
+                // Perform the actual work in another thread to avoid lock contention
+                // and allow the caller to continue on in its error cleanup.
+                executor.QueueUserWorkItem(AsyncOnExceptionHandler, error);
+            }
+        }
+
+        private void AsyncOnExceptionHandler(object error)
+        {
+            Exception cause = error as Exception;
+
+            MarkTransportFailed(cause);
+
+            try
+            {
+                this.transport.Dispose();
+            }
+            catch(Exception ex)
+            {
+                Tracer.DebugFormat("Connection[{0}]: Caught Exception While disposing of Transport: " + ex, this.ConnectionId);
+            }
+
+            this.brokerInfoReceived.countDown();
+
+            IList sessionsCopy = null;
+            lock(this.sessions.SyncRoot)
+            {
+                sessionsCopy = new ArrayList(this.sessions);
+            }
+
+            // Use a copy so we don't concurrently modify the Sessions list if the
+            // client is closing at the same time.
+            foreach(Session session in sessionsCopy)
+            {
+                try
+                {
+                    session.Shutdown();
+                }
+                catch(Exception ex)
+                {
+                    Tracer.DebugFormat("Connection[{0}]: Caught Exception While disposing of Sessions: " + ex, this.ConnectionId);
+                }
+            }
+        }
+
+        private void MarkTransportFailed(Exception error)
+        {
+            this.transportFailed.Value = true;
+            if(this.firstFailureError == null)
+            {
+                this.firstFailureError = error;
+            }
+        }
+
+        protected void OnTransportInterrupted(ITransport sender)
+        {
+            Tracer.Debug("Connection: Transport has been Interrupted.");
+
+            // Ensure that if there's an advisory consumer we don't add it to the
+            // set of consumers that need interruption processing.
+            this.transportInterruptionProcessingComplete =
+                new CountDownLatch(dispatchers.Count - (this.advisoryConsumer != null ? 1 : 0));
+
+            if(Tracer.IsDebugEnabled)
+            {
+                Tracer.DebugFormat("Connection[{0}]: Transport interrupted, dispatchers: " + dispatchers.Count, this.ConnectionId);
+            }
+
+            SignalInterruptionProcessingNeeded();
+
+            foreach(Session session in this.sessions)
+            {
+                try
+                {
+                    session.ClearMessagesInProgress();
+                }
+                catch(Exception ex)
+                {
+                    Tracer.WarnFormat("Connection[{0}]: Exception while clearing messages: " + ex.Message, this.ConnectionId);
+                    Tracer.Warn(ex.StackTrace);
+                }
+            }
+
+            if(this.ConnectionInterruptedListener != null && !this.closing.Value)
+            {
+                try
+                {
+                    this.ConnectionInterruptedListener();
+                }
+                catch
+                {
+                }
+            }
+        }
+
+        protected void OnTransportResumed(ITransport sender)
+        {
+            Tracer.Debug("Transport has resumed normal operation.");
+
+            if(this.ConnectionResumedListener != null && !this.closing.Value)
+            {
+                try
+                {
+                    this.ConnectionResumedListener();
+                }
+                catch
+                {
+                }
+            }
+        }
+
+        internal void OnSessionException(Session sender, Exception exception)
+        {
+            if(ExceptionListener != null)
+            {
+                try
+                {
+                    ExceptionListener(exception);
+                }
+                catch
+                {
+                    sender.Close();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Creates a new local transaction ID
+        /// </summary>
+        public LocalTransactionId CreateLocalTransactionId()
+        {
+            LocalTransactionId id = new LocalTransactionId();
+            id.ConnectionId = ConnectionId;
+            id.Value = Interlocked.Increment(ref localTransactionCounter);
+            return id;
+        }
+
+        protected SessionId NextSessionId
+        {
+            get { return new SessionId(this.info.ConnectionId, Interlocked.Increment(ref this.sessionCounter)); }
+        }
+
+        public ActiveMQTempDestination CreateTemporaryDestination(bool topic)
+        {
+            ActiveMQTempDestination destination = null;
+
+            if(topic)
+            {
+                destination = new ActiveMQTempTopic(
+                    info.ConnectionId.Value + ":" + Interlocked.Increment(ref temporaryDestinationCounter));
+            }
+            else
+            {
+                destination = new ActiveMQTempQueue(
+                    info.ConnectionId.Value + ":" + Interlocked.Increment(ref temporaryDestinationCounter));
+            }
+
+            DestinationInfo command = new DestinationInfo();
+            command.ConnectionId = ConnectionId;
+            command.OperationType = DestinationInfo.ADD_OPERATION_TYPE; // 0 is add
+            command.Destination = destination;
+
+            this.SyncRequest(command);
+
+            destination = this.AddTempDestination(destination);
+            destination.Connection = this;
+
+            return destination;
+        }
+
+        protected void CreateTemporaryDestination(ActiveMQDestination tempDestination)
+        {
+        }
+
+        public void DeleteTemporaryDestination(IDestination destination)
+        {
+            CheckClosedOrFailed();
+
+            ActiveMQTempDestination temp = destination as ActiveMQTempDestination;
+
+            foreach(Session session in this.sessions)
+            {
+                if(session.IsInUse(temp))
+                {
+                    throw new NMSException("A consumer is consuming from the temporary destination");
+                }
+            }
+
+            this.tempDests.Remove(destination as ActiveMQTempDestination);
+            this.DeleteDestination(destination);
+        }
+
+        public void DeleteDestination(IDestination destination)
+        {
+            DestinationInfo command = new DestinationInfo();
+            command.ConnectionId = this.ConnectionId;
+            command.OperationType = DestinationInfo.REMOVE_OPERATION_TYPE; // 1 is remove
+            command.Destination = (ActiveMQDestination)destination;
+
+            this.Oneway(command);
+        }
+
+        private void WaitForTransportInterruptionProcessingToComplete()
+        {
+            CountDownLatch cdl = this.transportInterruptionProcessingComplete;
+            if(cdl != null)
+            {
+                if(!closed.Value && cdl.Remaining > 0)
+                {
+                    Tracer.WarnFormat("Connection[{0}]: Dispatch paused, waiting for outstanding dispatch interruption " +
+                                      "processing (" + cdl.Remaining + ") to complete..", this.ConnectionId);
+                    cdl.await(TimeSpan.FromSeconds(10));
+                }
+
+                SignalInterruptionProcessingComplete();
+            }
+        }
+
+        internal void TransportInterruptionProcessingComplete()
+        {
+            CountDownLatch cdl = this.transportInterruptionProcessingComplete;
+            if(cdl != null)
+            {
+                cdl.countDown();
+                try
+                {
+                    SignalInterruptionProcessingComplete();
+                }
+                catch
+                {
+                }
+            }
+        }
+
+        private void SignalInterruptionProcessingComplete()
+        {
+            CountDownLatch cdl = this.transportInterruptionProcessingComplete;
+            if(cdl.Remaining == 0)
+            {
+                if(Tracer.IsDebugEnabled)
+                {
+                    Tracer.DebugFormat("Connection[{0}]: transportInterruptionProcessingComplete.", this.info.ConnectionId);
+                }
+
+                this.transportInterruptionProcessingComplete = null;
+
+                FailoverTransport failoverTransport = transport.Narrow(typeof(FailoverTransport)) as FailoverTransport;
+                if(failoverTransport != null)
+                {
+                    failoverTransport.ConnectionInterruptProcessingComplete(this.info.ConnectionId);
+                    if(Tracer.IsDebugEnabled)
+                    {
+                        Tracer.DebugFormat("Connection[{0}]: notified failover transport (" + failoverTransport +
+                                            ") of interruption completion.", this.ConnectionId);
+                    }
+                }
+            }
+        }
+
+        private void SignalInterruptionProcessingNeeded()
+        {
+            FailoverTransport failoverTransport = transport.Narrow(typeof(FailoverTransport)) as FailoverTransport;
+
+            if(failoverTransport != null)
+            {
+                failoverTransport.StateTracker.TransportInterrupted(this.info.ConnectionId);
+                if(Tracer.IsDebugEnabled)
+                {
+                    Tracer.DebugFormat("Connection[{0}]: notified failover transport (" + failoverTransport +
+                                        ") of pending interruption processing.", this.ConnectionId);
+                }
+            }
+        }
+
+        internal ActiveMQTempDestination AddTempDestination(ActiveMQTempDestination dest)
+        {
+            ActiveMQTempDestination addedDest = dest;
+
+            // .NET lacks a putIfAbsent operation for Maps.
+            lock(tempDests.SyncRoot)
+            {
+                if(!this.tempDests.Contains(dest))
+                {
+                    this.tempDests.Add(dest, dest);
+                }
+                else
+                {
+                    addedDest = this.tempDests[dest] as ActiveMQTempDestination;
+                }
+            }
+
+            return addedDest;
+        }
+
+        internal void RemoveTempDestination(ActiveMQTempDestination dest)
+        {
+            this.tempDests.Remove(dest);
+        }
+
+        internal bool IsTempDestinationActive(ActiveMQTempDestination dest)
+        {
+            if(this.advisoryConsumer == null)
+            {
+                return true;
+            }
+
+            return this.tempDests.Contains(dest);
+        }
+
+        protected void CheckClosedOrFailed()
+        {
+            CheckClosed();
+            if(transportFailed.Value)
+            {
+                throw new ConnectionFailedException(firstFailureError.Message);
+            }
+        }
+
+        protected void CheckClosed()
+        {
+            if(closed.Value)
+            {
+                throw new ConnectionClosedException();
+            }
+        }
+    }
 }



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