public Message Receive(TimeSpan timeout)
{
ThrowIfDisposedOrNotOpen();
//if we're receiving chunks, wait till that's done
TimeoutHelper helper = new TimeoutHelper(timeout);
if (!this.currentMessageCompleted.WaitOne(TimeoutHelper.ToMilliseconds(timeout), false))
{
throw new TimeoutException("Receive timed out waiting for previous message receive to complete");
}
//call receive on inner channel
Message message = innerChannel.Receive(helper.RemainingTime());
if (message != null && message.Headers.Action == ChunkingUtils.ChunkAction)
{
this.currentInputMessage = GetNewChunkingMessage(message, helper);
//start receiving chunks again
ThreadPool.QueueUserWorkItem(new WaitCallback(this.ReceiveChunkLoop), helper);
return(currentInputMessage);
}
else
{
this.currentMessageCompleted.Set();
return(message);
}
}
void ReceiveChunkLoop(object state)
{
TimeoutHelper timeouthelper = (TimeoutHelper)state;
//receive loop on a worker thread
Message message = null;
while (this.State == CommunicationState.Opened)
{
message = innerChannel.Receive(timeouthelper.RemainingTime());
if (message == null)
{
//a null message should not have been chunked to begin with
throw new CommunicationException("A null chunk message was received. Null message indicates the end of a session so a null chunk should never be received");
}
//add this chunk to current message
ProcessReceivedChunk(message);
if (IsLastChunk(message))
{
//we're done with the current message
this.currentInputMessage = null;
this.currentMessageCompleted.Set();
//stop this chunk receive loop
//will start again when above layer calls Receive and a new message is received
break;
}
}
receiveStopped.Set();
}
ChunkingMessage GetNewChunkingMessage(Message receivedMessage, TimeoutHelper timeoutHelper)
{
if (receivedMessage == null)
{
//end of session
return(null);
}
Guid messageId = GetMessageId(receivedMessage);
if (this.currentInputMessage != null && messageId == this.currentInputMessage.MessageId)
{
throw new InvalidOperationException("A new ChunkingMessage was requested but the received message's id matches the current message id. The received message is a chunk of the current message");
}
ChunkingReader reader = new ChunkingReader(receivedMessage, this.maxBufferedChunks, timeoutHelper);
string originalAction = receivedMessage.Headers.GetHeader <string>(
ChunkingUtils.OriginalAction,
ChunkingUtils.ChunkNs);
ChunkingMessage dechunkedMessage = new ChunkingMessage(receivedMessage.Version, originalAction, reader, messageId);
string addressingNs = ChunkingUtils.GetAddressingNamespace(receivedMessage.Version);
//read original headers from body of startingChunk and add them to headers of dechunkedMessage
for (int i = 0; i < receivedMessage.Headers.Count; i++)
{
MessageHeaderInfo headerInfo = receivedMessage.Headers[i];
if (headerInfo.Namespace != ChunkingUtils.ChunkNs &&
!(headerInfo.Name == "Action" && headerInfo.Namespace == addressingNs))
{
//not a chunking header and not the chunking wsa:Action header
//copy it to dechunkedMessage
dechunkedMessage.Headers.CopyHeaderFrom(
receivedMessage.Headers, i);
}
}
return(dechunkedMessage);
}
