udt
Class UDTReceiver

java.lang.Object
  udt.UDTReceiver

public class UDTReceiver
extends Object

receiver part of a UDT entity

See Also:

UDTSender

Field Summary

static boolean	connectionExpiryDisabled if set to true connections will not expire, but will only be closed by a Shutdown message
static int	dropRate

Constructor Summary

UDTReceiver(UDTSession session, UDPEndPoint endpoint)
create a receiver with a valid UDTSession

Method Summary

protected void	onAck2PacketReceived(Acknowledgment2 ack2) spec p.
protected void	onDataPacketReceived(DataPacket dp)
protected void	onShutdown()
protected void	processACKEvent(boolean isTriggeredByTimer) process ACK event (see spec.
protected void	processEXPEvent() process EXP event (see spec.
protected void	processNAKEvent() process NAK event (see spec.
protected void	processUDTPacket(UDTPacket p)
protected void	receive(UDTPacket p)
void	receiverAlgorithm() receiver algorithm see specification P11.
protected void	resetEXPCount()
protected void	resetEXPTimer()
protected long	sendAcknowledgment(long ackNumber)
protected void	sendKeepAlive()
protected long	sendLightAcknowledgment(long ackNumber)
protected void	sendNAK(List<Long> sequenceNumbers)
protected void	sendNAK(long currentSequenceNumber) write a NAK triggered by a received sequence number that is larger than the largestReceivedSeqNumber + 1
protected void	sendShutdown()
void	setAckInterval(long ackInterval)
void	stop()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

connectionExpiryDisabled

public static boolean connectionExpiryDisabled

if set to true connections will not expire, but will only be closed by a Shutdown message

dropRate

public static int dropRate

Constructor Detail

UDTReceiver

public UDTReceiver(UDTSession session,
                   UDPEndPoint endpoint)

create a receiver with a valid UDTSession

Parameters:

session -

Method Detail

receive

protected void receive(UDTPacket p)
                throws IOException

Throws:

IOException

receiverAlgorithm

public void receiverAlgorithm()
                       throws InterruptedException,
                              IOException

receiver algorithm see specification P11.

Throws:

InterruptedException

IOException

processACKEvent

protected void processACKEvent(boolean isTriggeredByTimer)
                        throws IOException

process ACK event (see spec. p 12)

Throws:

IOException

processNAKEvent

protected void processNAKEvent()
                        throws IOException

process NAK event (see spec. p 13)

Throws:

IOException

processEXPEvent

protected void processEXPEvent()
                        throws IOException

process EXP event (see spec. p 13)

Throws:

IOException

processUDTPacket

protected void processUDTPacket(UDTPacket p)
                         throws IOException

Throws:

IOException

onDataPacketReceived

protected void onDataPacketReceived(DataPacket dp)
                             throws IOException

Throws:

IOException

sendNAK

protected void sendNAK(long currentSequenceNumber)
                throws IOException

write a NAK triggered by a received sequence number that is larger than the largestReceivedSeqNumber + 1

Parameters:

currentSequenceNumber - - the currently received sequence number

Throws:

IOException

sendNAK

protected void sendNAK(List<Long> sequenceNumbers)
                throws IOException

Throws:

IOException

sendLightAcknowledgment

protected long sendLightAcknowledgment(long ackNumber)
                                throws IOException

Throws:

IOException

sendAcknowledgment

protected long sendAcknowledgment(long ackNumber)
                           throws IOException

Throws:

IOException

onAck2PacketReceived

protected void onAck2PacketReceived(Acknowledgment2 ack2)

spec p. 13:
1) Locate the related ACK in the ACK History Window according to the ACK sequence number in this ACK2.
2) Update the largest ACK number ever been acknowledged.
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.
4) Update RTTVar by: RTTVar = (RTTVar * 3 + abs(RTT - rtt)) / 4.
5) Update both ACK and NAK period to 4 * RTT + RTTVar + SYN.

sendKeepAlive

protected void sendKeepAlive()
                      throws IOException

Throws:

IOException

sendShutdown

protected void sendShutdown()
                     throws IOException

Throws:

IOException

resetEXPTimer

protected void resetEXPTimer()

resetEXPCount

protected void resetEXPCount()

setAckInterval

public void setAckInterval(long ackInterval)

onShutdown

protected void onShutdown()
                   throws IOException

Throws:

IOException

stop

public void stop()
          throws IOException

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object