protected void onAcknowledge(Acknowledgement acknowledgement)
{
try
{
waitForAckLatch.Get().CountDown();
waitForSeqAckLatch.Get().CountDown();
CongestionControl cc = session.getCongestionControl();
long rtt = acknowledgement.getRoundTripTime();
if (rtt > 0)
{
long rttVar = acknowledgement.getRoundTripTimeVar();
cc.setRTT(rtt, rttVar);
statistics.setRTT(rtt, rttVar);
}
long rate = acknowledgement.getPacketReceiveRate();
if (rate > 0)
{
long linkCapacity = acknowledgement.getEstimatedLinkCapacity();
cc.updatePacketArrivalRate(rate, linkCapacity);
statistics.setPacketArrivalRate(cc.getPacketArrivalRate(), cc.getEstimatedLinkCapacity());
}
long ackNumber = acknowledgement.getAckNumber();
cc.onACK(ackNumber);
statistics.setCongestionWindowSize((long)cc.getCongestionWindowSize());
//need to remove all sequence numbers up the ack number from the sendBuffer
bool removed = false;
for (long s = lastAckSequenceNumber; s < ackNumber; s++)
{
lock (sendLock)
{
removed = sendBuffer.Remove(s);
}
if (removed)
{
unacknowledged.DecrementAndGet();
}
}
lastAckSequenceNumber = (int)Math.Max(lastAckSequenceNumber, ackNumber);
//send ACK2 packet to the receiver
sendAck2(ackNumber);
statistics.incNumberOfACKReceived();
if (storeStatistics)
{
statistics.storeParameters();
}
}
catch (Exception ex)
{
Log.Write(this.ToString(), ex);
}
}
protected long sendAcknowledgment(long ackNumber)
{
try
{
Acknowledgement acknowledgmentPkt = buildLightAcknowledgement(ackNumber);
//set the estimate link capacity
estimateLinkCapacity = packetPairWindow.getEstimatedLinkCapacity();
acknowledgmentPkt.setEstimatedLinkCapacity(estimateLinkCapacity);
//set the packet arrival rate
packetArrivalSpeed = packetHistoryWindow.getPacketArrivalSpeed();
acknowledgmentPkt.setPacketReceiveRate(packetArrivalSpeed);
endpoint.doSend(acknowledgmentPkt);
statistics.incNumberOfACKSent();
statistics.setPacketArrivalRate(packetArrivalSpeed, estimateLinkCapacity);
return(acknowledgmentPkt.getAckSequenceNumber());
}
catch (Exception exc)
{
Log.Write(this.ToString(), exc);
return(0);
}
}