private void OnReadMessageLengthCompleted(IAsyncResult asyncResult_)
{
if (null == _readAsyncResult)
{
return; // Protocol has been reset, no further read/write data is of interest.
}
try
{
var bytesRead = Stream.EndRead(asyncResult_);
if (0 == bytesRead)
{
// 0 bytes read. Connection has been closed.
_readOutput = new NetProtocolReadOutput(NetProtocolReadType.EmptyRead, null);
_readAsyncResult.CompleteOperation();
return;
}
_bytesRead += bytesRead;
if (0 == BytesRemainingToBeRead)
{
BeginReadMessageContents();
}
else
{
Stream.BeginRead(_readBuffer, _bytesRead, BytesRemainingToBeRead, OnReadMessageLengthCompleted, null);
}
}
catch (Exception ex)
{
_readAsyncResult.CompleteOperation(ex);
}
}
private void BeginReadMessageContents()
{
var messageLength = BitConverter.ToInt32(_readBuffer, 0);
if (0 == messageLength)
{
// Keep alive message. Nothing to do.
_bytesRead = 0;
_readBuffer = new byte[0];
_readOutput = new NetProtocolReadOutput(NetProtocolReadType.KeepAlive, _readBuffer);
_readAsyncResult.CompleteOperation();
return;
}
ValidateReadMessageLength(messageLength);
_readBuffer = new byte[messageLength];
_bytesRead = 0;
Stream.BeginRead(_readBuffer, _bytesRead, BytesRemainingToBeRead, OnReadMessageCompleted, null);
}
private int ReadMessageLength()
{
_readBuffer = new byte[sizeof(int)];
_bytesRead = 0;
FillBufferFromStreamSync();
if (0 == _bytesRead)
{
_readOutput = new NetProtocolReadOutput(NetProtocolReadType.EmptyRead, null);
return(0);
}
var messageLength = BitConverter.ToInt32(_readBuffer, 0);
ValidateReadMessageLength(messageLength);
if (0 == messageLength)
{
_readOutput = new NetProtocolReadOutput(NetProtocolReadType.KeepAlive, new byte[0]);
}
return(messageLength);
}
private void OnReadMessageCompleted(IAsyncResult asyncResult_)
{
if (null == _readAsyncResult)
{
return; // Protocol has been reset, no further read/write data is of interest.
}
try
{
_bytesRead += Stream.EndRead(asyncResult_);
if (0 == BytesRemainingToBeRead)
{
_readOutput = new NetProtocolReadOutput(NetProtocolReadType.Message, _readBuffer);
_readAsyncResult.CompleteOperation();
}
else
{
Stream.BeginRead(_readBuffer, _bytesRead, BytesRemainingToBeRead, OnReadMessageCompleted, null);
}
}
catch (Exception ex)
{
_readAsyncResult.CompleteOperation(ex);
}
}