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();
}
}
protected void SendAck2(long ackSequenceNumber)
{
Acknowledgment2 ackOfAckPkt = new Acknowledgment2();
ackOfAckPkt.AckSequenceNumber = ackSequenceNumber;
ackOfAckPkt.SetSession(session);
ackOfAckPkt.DestinationID = session.Destination.SocketID;
endpoint.DoSend(ackOfAckPkt);
}
protected void sendAck2(long ackSequenceNumber)
{
try
{
Acknowledgment2 ackOfAckPkt = new Acknowledgment2();
ackOfAckPkt.setAckSequenceNumber(ackSequenceNumber);
ackOfAckPkt.setSession(session);
ackOfAckPkt.setDestinationID(session.getDestination().getSocketID());
endpoint.doSend(ackOfAckPkt);
}
catch (Exception ex)
{
Log.Write(this.ToString(), ex);
}
}
/**
* spec p. 13: <br/>
* 1) Locate the related ACK in the ACK History Window according to the
* ACK sequence number in this ACK2. <br/>
* 2) Update the largest ACK number ever been acknowledged. <br/>
* 3) Calculate new rtt according to the ACK2 arrival time and the ACK
* departure time, and update the RTT value as: RTT = (RTT * 7 +
* rtt) / 8. <br/>
* 4) Update RTTVar by: RTTVar = (RTTVar * 3 + abs(RTT - rtt)) / 4. <br/>
* 5) Update both ACK and NAK period to 4 * RTT + RTTVar + SYN. <br/>
*/
protected void onAck2PacketReceived(Acknowledgment2 ack2)
{
AckHistoryEntry entry = ackHistoryWindow.getEntry(ack2.AckSequenceNumber);
if (entry != null)
{
long ackNumber = entry.getAckNumber();
largestAcknowledgedAckNumber = Math.Max(ackNumber, largestAcknowledgedAckNumber);
long rtt = entry.getAge();
if (roundTripTime > 0)
{
roundTripTime = (roundTripTime * 7 + rtt) / 8;
}
else
{
roundTripTime = rtt;
}
roundTripTimeVar = (roundTripTimeVar * 3 + Math.Abs(roundTripTimeVar - rtt)) / 4;
ackTimerInterval = 4 * roundTripTime + roundTripTimeVar + Util.GetSYNTime();
nakTimerInterval = ackTimerInterval;
statistics.setRTT(roundTripTime, roundTripTimeVar);
}
}
protected void processUDTPacket(UDTPacket p)
{
//(3).Check the packet type and process it according to this.
try
{
if (!p.isControlPacket())
{
DataPacket dp = (DataPacket)p;
if (storeStatistics)
{
dataPacketInterval.end();
dataProcessTime.begin();
}
onDataPacketReceived(dp);//解析数据包将数据存在AppData类中
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();
}
}
catch (Exception exc)
{
Log.Write(this.ToString(), exc);
}
}