public bool isSentOut(long sequenceNumber)
{
return(SequenceNumber.compare(largestSentSequenceNumber, sequenceNumber) >= 0);
}
protected void onDataPacketReceived(DataPacket dp)
{
try
{
long currentSequenceNumber = dp.getPacketSequenceNumber();
//for TESTING : check whether to drop this packet
// n++;
// //if(dropRate>0 && n % dropRate == 0){
// if(n % 1111 == 0){
// logger.info("**** TESTING:::: DROPPING PACKET "+currentSequenceNumber+" FOR TESTING");
// return;
// }
// //}
bool OK = session.getSocket().getInputStream().haveNewData(currentSequenceNumber, dp.getData());//解析数据包将数据存在AppData类中
//Log.Write(this.ToString(), "receive data PacketSequenceNumber：" + currentSequenceNumber + " length:" + dp.getData().Length);
if (!OK)
{
//need to drop packet...
return;
}
long currentDataPacketArrivalTime = Util.getCurrentTime();
/*(4).if the seqNo of the current data packet is 16n+1,record the
* time interval between this packet and the last data packet
* in the packet pair window*/
if ((currentSequenceNumber % 16) == 1 && lastDataPacketArrivalTime > 0)
{
long interval = currentDataPacketArrivalTime - lastDataPacketArrivalTime;
packetPairWindow.add(interval);
}
//(5).record the packet arrival time in the PKT History Window.
packetHistoryWindow.add(currentDataPacketArrivalTime);
//store current time
lastDataPacketArrivalTime = (int)currentDataPacketArrivalTime;
//(6).number of detected lossed packet
/*(6.a).if the number of the current data packet is greater than LSRN+1,
* put all the sequence numbers between (but excluding) these two values
* into the receiver's loss list and send them to the sender in an NAK packet*/
if (SequenceNumber.compare(currentSequenceNumber, largestReceivedSeqNumber + 1) > 0)
{
sendNAK(currentSequenceNumber);
}
else if (SequenceNumber.compare(currentSequenceNumber, largestReceivedSeqNumber) < 0)
{
/*(6.b).if the sequence number is less than LRSN,remove it from
* the receiver's loss list
*/
receiverLossList.remove(currentSequenceNumber);
}
statistics.incNumberOfReceivedDataPackets();
//(7).Update the LRSN
if (SequenceNumber.compare(currentSequenceNumber, largestReceivedSeqNumber) > 0)
{
largestReceivedSeqNumber = (int)currentSequenceNumber;
}
//(8) need to send an ACK? Some cc algorithms use this
if (ackInterval > 0)
{
if (n % ackInterval == 0)
{
processACKEvent(false);
}
}
}
catch (Exception exc)
{
Log.Write(this.ToString(), exc);
}
}
public bool haveAcknowledgementFor(long sequenceNumber)
{
return(SequenceNumber.compare(sequenceNumber, lastAckSequenceNumber) <= 0);
}
