public override void ProcessDataPacket(ITcpDataPacket packet)
{
if (BasicTcpPacket.CompareSequences((ushort)(_sequenceIn + 1), packet.Sequence) == 0)
{
// This is exactly what we were expecting
_sequenceIn++;
if (packet.ResendCount > 0)
{
PacketCountReceiveDataResend++;
}
else
{
PacketCountReceiveDataFirst++;
}
SendAck(packet, true);
Socket.BufferClientData(packet.Data);
}
else if (BasicTcpPacket.CompareSequences((ushort)(_sequenceIn + 1), packet.Sequence) > 0)
{
// This is an old packet, don't process (already did that), just send ack
#if (DEBUG)
Logger.Debug("Got old Data packet, sending ACK, data already processed.");
#endif
SendAck(packet, false);
}
else
{
#if (DEBUG)
Logger.Debug("Got unexpected sequence (expected " + _sequenceIn + ") from packet " + packet);
#endif
}
}
// Received this data packet
public override void ProcessDataPacket(ITcpDataPacket packet)
{
if (!Closed)
{
lock (_processDataLock)
{
Stats.DataPacketsReceived++;
int compareSequences = BasicTcpPacket.CompareSequences(_nextDataSeqIn, packet.Sequence);
if (compareSequences == 0)
{
Stats.ExpectedDataPacketsReceived++;
if (BasicTcpPacket.CompareSequences(packet.Sequence, _highestDataSeqIn) > 0)
{
_highestDataSeqIn = packet.Sequence;
}
// This is exactly what we were expecting
// pop it in our list
ITcpDataPacket currentPacket = _recvWindow[_recvWindowsNextFree] = packet;
// Now flush our window until we get to a gap
while (_recvWindow[_recvWindowsNextFree] != null)
{
currentPacket = _recvWindow[_recvWindowsNextFree];
// Send Data Upstream (only it not closed)
if (!Socket.Closed && !Socket.Closing)
{
Socket.BufferClientData(currentPacket.Data);
}
#if DEBUG
else
{
Logger.Debug("Got a data packet, but not writing to socket, because its closed or closing");
}
#endif
// clear this space in our window
_recvWindow[_recvWindowsNextFree] = null;
// increment our pointer to next space
_recvWindowsNextFree = (byte)((_recvWindowsNextFree + 1) % WindowSize);
// increment our next next expected sequence number
_nextDataSeqIn++;
#if DEBUG
Logger.Debug("Processed sq=" + currentPacket.Sequence + " upstream, nextDataSeqIn=" +
_nextDataSeqIn + ", recvWindowNextFree=" + _recvWindowsNextFree +
", highestDataSeqIn=" + _highestDataSeqIn);
#endif
}
// Send Ack (only when done with sending all the packets we can)
SendAck(currentPacket, currentPacket, true);
_lastAckedPacket = currentPacket;
}
else if (compareSequences > 0)
{
Stats.OldDataPacketsReceived++;
if (packet.ResendCount > 0)
{
Stats.OldDataResendPacketsReceived++;
}
// This is an old packet, don't process (already did that), just send ack
#if DEBUG
Logger.Debug("Got old Data packet (resend=" + packet.ResendCount +
"), sending ACK, data already processed.");
#endif
SendAck(packet, _lastAckedPacket, false);
}
else
{
Stats.FutureDataPacketsReceived++;
// This is an out of sequence packet from the future,
// if it fits in our window, we need to save it for future use
int differenceInSequences = DifferenceInSequences(_nextDataSeqIn, packet.Sequence);
if (differenceInSequences < WindowSize)
{
// ok we can put it in
_recvWindow[(_recvWindowsNextFree + differenceInSequences) % WindowSize] = packet;
if (BasicTcpPacket.CompareSequences(packet.Sequence, _highestDataSeqIn) > 0)
{
_highestDataSeqIn = packet.Sequence;
}
#if DEBUG
Logger.Debug("Queued sq=" + packet.Sequence + " in window, nextDataSeqIn=" + _nextDataSeqIn +
", recvWindowNextFree=" + _recvWindowsNextFree + ", highestDataSeqIn=" +
_highestDataSeqIn);
#endif
// Now we send an ack for the last in sequence packet we received
if (_lastAckedPacket != null)
{
SendAck(packet, _lastAckedPacket, false);
Stats.HoldingAcksSent++;
}
}
else
{
#if DEBUG
Logger.Debug("Got too far in the future sequence (expected " + _nextDataSeqIn + ") from packet " +
packet + ", dropping");
#endif
// Now we send an ack for the last in sequence packet we received
if (_lastAckedPacket != null)
{
SendAck(_lastAckedPacket, _lastAckedPacket, false);
Stats.HoldingAcksSent++;
}
}
}
#if DEBUG
if (Stats.DataPacketsReceived % 1000 == 0)
{
Logger.Debug("Received Stats:\n" + Stats.GetReceiverStats());
}
#endif
Monitor.PulseAll(_processDataLock);
}
}
else
{
Logger.Error("Failed to process data packet, the connection closed.");
}
}