public object GetInstance(System.ServiceModel.InstanceContext instanceContext)
{
SsbConversationContext conversationContext = (SsbConversationContext)OperationContext.Current.IncomingMessageProperties[SsbConstants.SsbConversationMessageProperty];
SqlConnection con = OperationContext.Current.Channel.GetProperty <SsbConversationSender>().GetConnection();
return(GetInstance(conversationContext, con));
}
public object GetInstance(System.ServiceModel.InstanceContext instanceContext, System.ServiceModel.Channels.Message message)
{
SsbConversationContext conversationContext = (SsbConversationContext)OperationContext.Current.IncomingMessageProperties[SsbConstants.SsbConversationMessageProperty];
SsbConversationGroupReceiver cgr = OperationContext.Current.Channel.GetProperty <SsbConversationGroupReceiver>();
SqlConnection con = cgr.GetConnection();
Guid conversationGroupID = cgr.ConversationGroupId;
TService instance = (TService)GetInstance(conversationContext, con);
cgr.Closing += delegate(object sender, EventArgs e)
{
//SsbConversationGroupReceiver cgr = (SsbConversationGroupReceiver)sender;
ReleaseInstance(conversationGroupID, instance, con);
};
return(instance);
}
/// <summary>
/// Convenience method for configuraing a callback channel. Since this is not a duplex channel it doesn't
/// support the declarative callbacks in the normal WCF method.
/// </summary>
/// <typeparam name="TContract"></typeparam>
/// <returns></returns>
public TContract GetCallback<TContract>()
{
ThrowIfDisposedOrNotOpen();
try
{
Binding binding = channelListener.CreateResponseBinding();
TContract channel = ChannelFactory<TContract>.CreateChannel(binding,new EndpointAddress(SsbUri.Default));
SsbConversationSender sender = ((IClientChannel)channel).GetProperty<SsbConversationSender>();
sender.SetConnection(con);
((IClientChannel)channel).Open();
SsbConversationContext conversation = OperationContext.Current.IncomingMessageProperties[SsbConstants.SsbConversationMessageProperty] as SsbConversationContext;
sender.OpenConversation(conversation.ConversationHandle);
return channel;
}
catch (Exception ex)
{
throw new CommunicationException("An error occurred while obtaining callback channel: " + ex.Message, ex);
}
}
/// <summary>
/// Ends the Service Broker conversation and sends a custom error message on the conversation.
/// Issues this command to SQL SErver
/// END CONVERSATION @ConversationHandle WITH ERROR = @errorCode DESCRIPTION = @errorDescription
/// </summary>
/// <param name="errorCode">The error code passed to END CONVERSATION</param>
///
/// <param name="errorDescription">The Error description passed to END CONVERSATION</param>
///
public void EndConversationWithError(int errorCode, string errorDescription)
{
ThrowIfDisposedOrNotOpen();
SsbConversationContext conversation = OperationContext.Current.IncomingMessageProperties[SsbConstants.SsbConversationMessageProperty] as SsbConversationContext;
try
{
string SQL = "END CONVERSATION @ConversationHandle WITH ERROR = @error DESCRIPTION = @description";
SqlCommand cmd = new SqlCommand(SQL, con);
cmd.Parameters.Add("@ConversationHandle", SqlDbType.UniqueIdentifier).Value = conversation.ConversationHandle;
cmd.Parameters.Add("@error", SqlDbType.Int).Value = errorCode;
cmd.Parameters.Add("@description", SqlDbType.NVarChar, 3000).Value = errorDescription;
cmd.ExecuteNonQuery();
}
catch (SqlException ex)
{
throw new CommunicationException(String.Format("An exception occurred while ending conversation {0}.", conversation.ConversationHandle), ex);
}
}
protected abstract TService GetInstance(SsbConversationContext conversationContext, SqlConnection con);
internal byte[] Receive(TimeSpan timeout, BufferManager bm, out int messageLength, out SsbConversationContext conversation,WaitHandle cancelEvent)
{
ThrowIfDisposedOrNotOpen();
byte[] message = null;
conversation = null;
messageLength = 0;
if (queuedResult != null)
{
ReceivedMessage r = queuedResult;
queuedResult = null;
conversation = r.Conversation;
messageLength = r.MessageLength;
byte[] buf = bm.TakeBuffer(messageLength);
Buffer.BlockCopy(r.MessageBody, 0, buf, 0, messageLength);
return buf;
}
try
{
lock (rdrlock)
{
//If this is the first time, open the reader, otherwise read the next row
if ( rdr == null || !rdr.Read() )
{
//the last bactch has been processed. Close the reader.
if (rdr != null)
{
rdr.Close();
}
rdr = GetMessageBatch(timeout,cancelEvent);
//this is a timeout condition
//caused by aborting or closing the reciever
if ( rdr == null )
{
return null;
}
//this is a timeout condition caused by the WAITFOR expiring
if( !rdr.Read() )
{
rdr.Close();
//return the Receiver to it's initial state.
rdr = null;
return null;
}
}
int i = 0;
int conversation_handle = i++;
int service_name = i++;
int message_type_name = i++;
int message_body = i++;
int message_sequence_number = i++;
Guid conversationHandle = rdr.GetGuid(conversation_handle);
string ServiceName = rdr.GetString(service_name);
string messageTypeName = rdr.GetString(message_type_name);
if (messageTypeName != SsbConstants.SsbEndDialogMessage && messageTypeName != SsbConstants.SsbDialogTimerMessage)
{
//this eliminates a one copy because the message_body
//isn't copied into the row buffer. Instead it's chunked directly
//into the message byte[].
// CONSIDER (dbrowne) wraping the reader in a custom stream implementation
//and pass that back instead to eliminate another copy.
messageLength = (int)rdr.GetBytes(message_body, 0, null, 0, 0);
if (bm == null)
{
message = new byte[messageLength];
}
else
{
message = bm.TakeBuffer(messageLength);
}
int br = (int)rdr.GetBytes(message_body, 0, message, 0, messageLength);
if (br != messageLength) //should never happen
{
throw new Exception("Failed to read all the message bytes");
}
}
long sequence = rdr.GetInt64(message_sequence_number);
conversation = new SsbConversationContext(conversationHandle, this.cgId, sequence, messageTypeName);
if (messageTypeName == SsbConstants.SsbErrorMessage)
{
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.Load(new System.IO.MemoryStream(message, 0, messageLength));
System.Xml.XmlNamespaceManager mgr = new System.Xml.XmlNamespaceManager(doc.NameTable);
mgr.AddNamespace("er", SsbConstants.SsbErrorMessage);
int code = int.Parse(doc.SelectSingleNode("/er:Error/er:Code", mgr).InnerText);
string ermsg = doc.SelectSingleNode("/er:Error/er:Description", mgr).InnerText;
throw new ProtocolException(string.Format("Service Broker Error Message {0}: {1}", code, ermsg));
}
SsbInstrumentation.MessageRecieved(messageLength);
return message;
//if (messageTypeName == SsbConstants.SsbDialogTimerMessage)
//{
// //well now we're running again after a lag, now what?
//}
}
}
catch (SqlException ex)
{
//the timeout will not result in a SqlExecption since the timeout value is passed to WAITFOR RECIEVE
//if (!helper.IsTimeRemaining)
//{
// throw new TimeoutException(String.Format("Timed out while receiving. Timeout value was {0} seconds", timeout.TotalSeconds), ex);
//}
throw new CommunicationException(String.Format("An exception occurred while receiving from conversation group {0}.", this.cgId), ex);
}
}
internal byte[] Receive(TimeSpan timeout, BufferManager bm, out int messageLength, out SsbConversationContext conversation)
{
return Receive(timeout, bm, out messageLength, out conversation, cancelEvent);
}
public void EndConversation()
{
SsbConversationContext conversation = OperationContext.Current.IncomingMessageProperties[SsbConstants.SsbConversationMessageProperty] as SsbConversationContext;
this.EndConversation(conversation.ConversationHandle, this.DefaultCloseTimeout);
}
