public UDTSession(string description, Destination destination)
{
statistics = new UDTStatistics(description);
mySocketID = Interlocked.Increment(ref nextSocketID);
this.destination = destination;
this.dgPacket = new UDPUserToken(destination.EndPoint);
//String clazzP = System.getProperty(CC_CLASS, UDTCongestionControl.class.getName());
Object ccObject = null;
ccObject = new UDTCongestionControl(this);
//try{
// Class<?>clazz=Class.forName(clazzP);
// ccObject=clazz.getDeclaredConstructor(UDTSession.class).newInstance(this);
//}catch(Exception e){
// logger.log(Level.WARNING,"Can't setup congestion control class <"+clazzP+">, using default.",e);
// ccObject=new UDTCongestionControl(this);
//}
cc = (ICongestionControl)ccObject;
//logger.info("Using "+cc.getClass().getName());
}
protected void OnAcknowledge(Acknowledgement acknowledgement)
{
waitForAckLatch.Signal();
waitForSeqAckLatch.Signal();
//cd
long ackNumber = acknowledgement.AckNumber;
// cd
if (this.session is ClientSession)
{
//cd
if (this.isModify)
{
//已经发送过10000包，不用再修正，认为接收方已经关闭
if (bufferNum < 10000)
{
if (ackNumber / 100000 != this.session.InitialSequenceNumber / 100000)
{
//认为不同段的seqNo,则不是通信的接收方session
statistics.incNumberOfACKReceived();
if (storeStatistics)
{
statistics.StoreParameters();
}
return;
}
}
else
{
this.isModify = false; //不用再修正
}
}
}
ICongestionControl cc = session.CongestionControl;
long rtt = acknowledgement.RoundTripTime;
if (rtt > 0)
{
long rttVar = acknowledgement.RoundTripTimeVar;
cc.SetRTT(rtt, rttVar);
statistics.setRTT(rtt, rttVar);
}
long rate = acknowledgement.PacketReceiveRate;
if (rate > 0)
{
long linkCapacity = acknowledgement.EstimatedLinkCapacity;
cc.UpdatePacketArrivalRate(rate, linkCapacity);
statistics.setPacketArrivalRate(cc.GetPacketArrivalRate(), cc.GetEstimatedLinkCapacity());
}
cc.OnACK(ackNumber);
statistics.CongestionWindowSize = ((long)cc.GetCongestionWindowSize());
//need to remove all sequence numbers up the ack number from the sendBuffer
bool removed = false;
DataPacket packet = null;
for (long s = lastAckSequenceNumber; s < ackNumber; s++)
{
lock (sendLock) {
removed = sendBuffer.TryRemove(s, out packet);
}
if (removed)
{
Interlocked.Decrement(ref unacknowledged);
bufferNum++; //cd
}
}
lastAckSequenceNumber = Math.Max(lastAckSequenceNumber, ackNumber);
//send ACK2 packet to the receiver
SendAck2(ackNumber);
//
statistics.incNumberOfACKReceived();
if (storeStatistics)
{
statistics.StoreParameters();
}
}
