private void HttpGetResponseThread()
{
try
{
// List<IAsyncResult> results = new List<IAsyncResult>();
bool isEOM = false;
// ProcessResponseDelegate p = ProcessResponses;
int responseCount = 0;
// while (!isEOM)
// {
SessionBase.TraceSource.TraceInformation("Begin PullResponse : count {0} : clientId {1}", this.count, this.clientId);
BrokerResponseMessages responseMessages = this.controller.PullResponses(this.action, this.resetToBegin, this.count, this.clientId);
SessionBase.TraceSource.TraceInformation("End PullResponse : count {0} : isEOM {1}", responseMessages.SOAPMessage.Length, responseMessages.EOM);
// responseCount += responseMessages.SOAPMessage.Length;
responseCount = responseMessages.SOAPMessage.Length;
// results.Add(p.BeginInvoke(responseMessages, clientData, null, null));
this.ProcessResponses(responseMessages, this.clientData);
Interlocked.Add(ref this.responseClient.totalResponseCount, responseCount);
isEOM = responseMessages.EOM;
if (isEOM)
{
// construct endofreponses message
TypedMessageConverter converter = TypedMessageConverter.Create(typeof(EndOfResponses), Constant.EndOfMessageAction);
EndOfResponses endOfResponses = new EndOfResponses();
endOfResponses.Count = this.responseClient.totalResponseCount;
endOfResponses.Reason = EndOfResponsesReason.Success;
Message eom = converter.ToMessage(endOfResponses, MessageVersion.Soap11);
eom.Headers.Add(MessageHeader.CreateHeader(Constant.ResponseCallbackIdHeaderName, Constant.ResponseCallbackIdHeaderNS, this.clientData));
this.callback.SendResponse(eom);
}
}
catch (Exception e)
{
SessionBase.TraceSource.TraceInformation("PullResponse Exception: {0}", e.ToString());
if (this.disposeFlag)
{
return;
}
Message exceptionMessage = Message.CreateMessage(MessageVersion.Soap11, @"http://hpc.microsoft.com/ClientSideExeption");
exceptionMessage.Headers.Add(MessageHeader.CreateHeader(Constant.ResponseCallbackIdHeaderName, Constant.ResponseCallbackIdHeaderNS, this.clientData));
exceptionMessage.Properties.Add(@"HttpClientException", e);
this.callback.SendResponse(exceptionMessage);
}
finally
{
if (this.Completed != null)
{
this.Completed(this, EventArgs.Empty);
}
}
}
/// <summary>
/// reply the end of message to the client.
/// </summary>
/// <param name="callback">the response service callback.</param>
/// <param name="clientData">the client data.</param>
/// <param name="clientPurged">indicating the client purged flag</param>
private void ReplyEndOfMessage(IResponseServiceCallback callback, string clientData, EndOfResponsesReason reason)
{
if (this.callbackChannelDisposed)
{
return;
}
BrokerTracing.TraceInfo("[GetResponsesHandler] Client {0}: Send end of response, clientPurged = {1}", this.clientId, reason);
this.ResetTimeout();
TypedMessageConverter converter = TypedMessageConverter.Create(typeof(EndOfResponses), Constant.EndOfMessageAction);
EndOfResponses endOfResponses = new EndOfResponses();
endOfResponses.Count = this.ResponsesCount;
endOfResponses.Reason = reason;
Message eom = converter.ToMessage(endOfResponses, this.Version);
eom.Headers.Add(MessageHeader.CreateHeader(Constant.ResponseCallbackIdHeaderName, Constant.ResponseCallbackIdHeaderNS, clientData));
this.eorReplied = true;
try
{
if (callback is AzureQueueProxy)
{
callback.SendResponse(eom, clientData);
}
else
{
callback.SendResponse(eom);
}
}
catch (ObjectDisposedException)
{
BrokerTracing.TraceEvent(System.Diagnostics.TraceEventType.Error, 0, "[BrokerClient] Client {0}: Send end of response error: communication object is disposed.", this.clientId);
this.callbackChannelDisposed = true;
this.Queue.ResetResponsesCallback();
}
catch (Exception ce)
{
BrokerTracing.TraceEvent(System.Diagnostics.TraceEventType.Error, 0, "[BrokerClient] Client {0}: Send end of response error: {1}", this.clientId, ce);
// Swallow exception
}
}
/// <summary>
/// Receives response messages from broker's response service
/// </summary>
/// <param name="message">Response message</param>
public void SendResponse(Message message)
{
try
{
int currentResponseCount = 0;
// Reset the heartbeat since operation just succeeded
this.session.ResetHeartbeat();
// Reset timeout timer since a response was received
if (this.responseHandlerTimeoutTimer != null)
{
this.responseHandlerTimeoutTimer.Change(this.responseHanderTimeout, 0);
}
// Bug #15946: handling client side exception thrown from WebResponseHandler(when talking to rest service)
if (string.Equals(message.Headers.Action, Constant.WebAPI_ClientSideException, StringComparison.Ordinal))
{
Exception e = message.Properties[Constant.WebAPI_ClientSideException] as Exception;
this.InvokeCallback(new BrokerResponse <TMessage>(e, message.Headers.RelatesTo));
return;
}
// TODO: Consider whether user callback should get an EOM message
if (!Utility.IsEOM(message))
{
// If the handler is closed, timed out, closed or broker heartbeat signaled, dont forward any more requests to the user.
// NOTE: If some responses already slipped through its OK because we prefer that over adding a lock here
if (this.shuttingDown)
{
return;
}
// Create a BrokerResponse object wrapper for the message object. A copy of the message must be created
MessageBuffer messageBuffer = null;
try
{
messageBuffer = message.CreateBufferedCopy(Constant.MaxBufferSize);
}
catch (Exception e)
{
Utility.LogError("AsyncResponseCallback.SendResponse received exception - {0}", e);
this.InvokeCallback(new BrokerResponse <TMessage>(e, message.Headers.RelatesTo));
return;
}
BrokerResponse <TMessage> brokerResponse = this.CreateResponse(BrokerClientBase.GetActionFromResponseMessage(message),
!message.IsFault ? message.Headers.Action : String.Empty,
messageBuffer,
message.Headers.RelatesTo == null ? SoaHelper.GetMessageId(message) : message.Headers.RelatesTo);
BrokerResponse <TMessage> lastResponse = null;
if (this.ignoreIsLastResponseProperty)
{
lastResponse = brokerResponse;
}
else
{
// Atomically swap out the last response.
lastResponse = Interlocked.Exchange <BrokerResponse <TMessage> >(ref this.lastBrokerResponse, brokerResponse);
}
// If there was a previous last response
if (lastResponse != null)
{
// Send it to the callback
this.InvokeCallback(lastResponse);
// Increment response count
currentResponseCount = Interlocked.Increment(ref this.currentResponseCount);
}
// If the caller wants all messages at once, do so.
// Else we always request ResponseWindowSize * 2 messages. If we get to
// the end of a window, request another
if (this.responseWindowSize != Constant.GetResponse_All && currentResponseCount != 0 &&
(currentResponseCount + 1) % this.responseWindowSize == 0)
{
// Call async version and block on completion in order to workaround System.Net.Socket bug #750028
try
{
SessionBase.TraceSource.TraceInformation("GetResponse : currentResponseCount {0} : clientId {1}", currentResponseCount, this.clientId);
this.responseService.GetResponses(
this.action,
this.callbackManagerId,
GetResponsePosition.Current,
this.responseWindowSize,
this.clientId);
}
catch (FaultException <SessionFault> e)
{
throw Utility.TranslateFaultException(e);
}
}
}
// If this is a client purged fault, return that exception in a BrokerResponse
else
{
TypedMessageConverter endOfResponsesConverter = TypedMessageConverter.Create(typeof(EndOfResponses), Constant.EndOfMessageAction);
EndOfResponses endOfResponses = (EndOfResponses)endOfResponsesConverter.FromMessage(message);
switch (endOfResponses.Reason)
{
case EndOfResponsesReason.ClientPurged:
this.InvokeCallback(new BrokerResponse <TMessage>(SessionBase.ClientPurgedException, new UniqueId(Guid.Empty)));
break;
case EndOfResponsesReason.ClientTimeout:
this.InvokeCallback(new BrokerResponse <TMessage>(SessionBase.ClientTimeoutException, new UniqueId(Guid.Empty)));
break;
default:
// Save how many responses are expected (minus 1 for the last response)
System.Diagnostics.Debug.Assert(endOfResponses.Count > 0, "Response count should also be positive number");
this.expectedResponseCount = endOfResponses.Count - 1;
break;
}
}
if (!this.ignoreIsLastResponseProperty)
{
// Check to see if we receive the EOM message and all the responses.
// If so pass last response to callback marked as such. Also make
// sure this isnt called again with a lock.
if (this.expectedResponseCount == this.currentResponseCount)
{
lock (this.lastResponseLock)
{
if (this.expectedResponseCount == this.currentResponseCount)
{
// Mark the response as the last one
this.lastBrokerResponse.isLastResponse = true;
// Send last response to callback. Note since currentResponseCount
// is incremented after responses are sent to the callback, the
// callback will not be processing any other responses at this time.
this.InvokeCallback(this.lastBrokerResponse);
this.expectedResponseCount = -1;
}
}
}
}
}
catch (Exception e)
{
// Log and eat unhandled user exceptions from their calback
Utility.LogError("Unhandled exception processing response - {0}", e);
}
}
/// <summary>
/// Receives new response messages from broker
/// </summary>
/// <param name="response">Response message</param>
void IResponseServiceCallback.SendResponse(Message response)
{
MessageBuffer messageBuffer = null;
EndOfResponses endOfResponses = null;
Exception clientSideException = null;
bool isEOM = false;
// Reset the heartbeat since operation just succeeded
this.session.ResetHeartbeat();
try
{
// Check whether this is an EOM message
isEOM = Utility.IsEOM(response);
if (!isEOM)
{
// If not EOM, create a copy of the message's buffer so it can be deserialized
// A copy is needed because WCF will dispose this message when the callback returns
// Alternatively we could deserialize the entire message but we want
// callback to be quick and we may wind up deserializing messages the user
// never looks at (i.e. just checks user data or exits enum early)
try
{
messageBuffer = response.CreateBufferedCopy(Constant.MaxBufferSize);
}
catch (Exception e)
{
SessionBase.TraceSource.TraceEvent(TraceEventType.Error, 0, "[Session:{0}][BrokerResponseEnumerator] Failed to create message buffer from the response message: {1}", this.session.Id, e);
clientSideException = e;
}
}
else
{
// If EOM, deserialize EndOfResponses message
endOfResponses = (EndOfResponses)this.endOfResponsesConverter.FromMessage(response);
}
string messageId = String.Empty;
try
{
messageId = SoaHelper.GetMessageId(response).ToString();
}
catch
{
// Swallow possible ObjectDisposedException
}
SessionBase.TraceSource.TraceEvent(TraceEventType.Verbose, 0, "[Session:{0}][BrokerResponseEnumerator] Response received from broker. IsEOM = {1}, MessageId = {2}", this.session.Id, isEOM, messageId);
lock (this.responsesLock)
{
// If the enumerator is disposing or disposed, return
if (this.isDisposeCalled)
{
return;
}
// If this is not an EOM message
if (!isEOM)
{
string actionFromResponse = BrokerClientBase.GetActionFromResponseMessage(response);
// Save the response in the current window
MessageWindowItem messageItem = new MessageWindowItem(
messageBuffer,
actionFromResponse,
!response.IsFault ? response.Headers.Action : String.Empty,
response.Headers.RelatesTo == null ? SoaHelper.GetMessageId(response) : response.Headers.RelatesTo);
// Bug #15946: handling client side exception thrown from WebResponseHandler(when talking to rest service)
// To propagate the client side exception to BrokerResponseEnumerator api, store the exception in MessageWindowItem
if (string.Equals(response.Headers.Action, Constant.WebAPI_ClientSideException, StringComparison.Ordinal))
{
clientSideException = response.Properties[Constant.WebAPI_ClientSideException] as Exception;
}
messageItem.CarriedException = clientSideException;
this.currentReceiveWindow.Enqueue(messageItem);
// Increment the current number of responses
this.currentResponseCount++;
// Lower number of outstanding requests
if (Interlocked.Decrement(ref this.outstandingRequestCount) == 0)
{
try
{
this.GetMoreResponses(false, ResponseWindowSize);
}
catch (Exception e)
{
SessionBase.TraceSource.TraceEvent(TraceEventType.Error,
0, "[Session:{0}][BrokerResponseEnumerator] Failed to get more responses in SendResponse context: {1}", this.session.Id, e);
// Send broker down signal since connection to broker might be bad
((IResponseServiceCallback)this).SendBrokerDownSignal(false);
}
}
// If the current window is full or there are no more responses
if (this.currentReceiveWindow.Count == ResponseWindowSize ||
this.currentResponseCount == this.totalResponseCount)
{
// Disable the flush timer
this.flushResponsesTimer.Change(Timeout.Infinite, Timeout.Infinite);
// Immediately flush the receive window
this.FlushCurrentReceiveWindow();
}
// Otherwise reset the flushtimer to the full interval
else
{
this.flushResponsesTimer.Change(this.flushResponsesTimerInterval, Timeout.Infinite);
}
}
else
{
// If we already received an EOM, ignore any others. We may get multiple EOM since
// more responses are requested until we get EOM. This can lead to overrequesting.
if (this.totalResponseCount != -1)
{
return;
}
// Save total response count
this.totalResponseCount = endOfResponses.Count;
this.endOfResponsesReason = endOfResponses.Reason;
// If there are no more responses
if (this.currentResponseCount == this.totalResponseCount)
{
// Make the current receive window available to enumerator if it has responses
if (this.currentReceiveWindow.Count != 0)
{
this.responsesWindows.Enqueue(this.currentReceiveWindow);
this.currentReceiveWindow = new Queue <MessageWindowItem>();
}
// Notify enumerator that a new window is available. Notify even if
// its empty since it allows MoveNext to exit and return there are no
// more items
this.newResponseWindowOrEOM.Set();
}
}
}
}
catch (Exception e)
{
// If we get an exception here log and dispose the enum
this.Dispose();
SessionBase.TraceSource.TraceEvent(TraceEventType.Error, 0, "[Session:{0}][BrokerResponseEnumerator] Unhandled exception in response enumerator callback :{1}", this.session.Id, e);
}
}
