protected void ProcessUDTPacket(IUDTPacket p)
{
//(3).Check the packet type and process it according to this.
if (!p.IsControlPacket())
{
DataPacket dp = (DataPacket)p;
if (storeStatistics)
{
dataPacketInterval.End();
dataProcessTime.Begin();
}
OnDataPacketReceived(dp);
if (storeStatistics)
{
dataProcessTime.End();
dataPacketInterval.Begin();
}
}
else if (p.GetControlPacketType() == (int)ControlPacketType.ACK2)
{
Acknowledgment2 ack2 = (Acknowledgment2)p;
onAck2PacketReceived(ack2);
}
else if (p is Shutdown)
{
OnShutdown();
}
}
/*
* packets are written by the endpoint
*/
internal void Receive(IUDTPacket p)
{
if (storeStatistics)
{
dgReceiveInterval.End();
}
handoffQueue.Add(p);
if (storeStatistics)
{
dgReceiveInterval.Begin();
}
}
/**
* sends the given data packet, storing the relevant information
*
* @param data
* @throws IOException
* @throws InterruptedException
*/
private void Send(DataPacket p)
{
lock (sendLock){
if (storeStatistics)
{
dgSendInterval.End();
dgSendTime.Begin();
}
endpoint.DoSend(p);
if (storeStatistics)
{
dgSendTime.End();
dgSendInterval.Begin();
throughput.End();
throughput.Begin();
}
sendBuffer[p.GetPacketSequenceNumber()] = p;
Interlocked.Increment(ref unacknowledged);
}
statistics.incNumberOfSentDataPackets();
}
/**
* receiver algorithm
* see specification P11.
*/
public void ReceiverAlgorithm()
{
//check ACK timer
long currentTime = Util.getCurrentTime();
if (nextACK < currentTime)
{
nextACK = currentTime + ackTimerInterval;
ProcessACKEvent(true);
}
//check NAK timer
if (nextNAK < currentTime)
{
nextNAK = currentTime + nakTimerInterval;
ProcessNAKEvent();
}
//check EXP timer
if (nextEXP < currentTime)
{
nextEXP = currentTime + expTimerInterval;
ProcessEXPEvent();
}
//perform time-bounded UDP receive
IUDTPacket packet = null;
handoffQueue.TryTake(out packet, (int)Util.GetSYNTime());
if (packet != null)
{
//reset exp count to 1
expCount = 1;
//If there is no unacknowledged data packet, or if this is an
//ACK or NAK control packet, reset the EXP timer.
bool needEXPReset = false;
if (packet.IsControlPacket())
{
ControlPacket cp = (ControlPacket)packet;
int cpType = cp.GetControlPacketType();
if (cpType == (int)ControlPacketType.ACK || cpType == (int)ControlPacketType.NAK)
{
needEXPReset = true;
}
}
if (needEXPReset)
{
nextEXP = Util.getCurrentTime() + expTimerInterval;
}
if (storeStatistics)
{
processTime.Begin();
}
ProcessUDTPacket(packet);
if (storeStatistics)
{
processTime.End();
}
}
Thread.Yield();
}
