sime

Class Router.OutputPort

java.lang.Object

sime.Router.OutputPort

Enclosing class:

Router

protected class Router.OutputPort
extends java.lang.Object

Inner class for router's output ports.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) double	maxMismatchRatio Mismatch ratio of transmission speeds between the input and output links of this router.
(package private) double	mismatchCount Counts how many packets to receive before one can be sent if the outgoing link is slower than incoming links. Different increments may be associated with different incoming links.
(package private) Link	outgoingLink The outgoing link associated with this output port.
(package private) Packet	packetInTransmission Holds the packet currently in transmission on the outgoing link.

Constructor Summary

Constructors

Constructor and Description
Router.OutputPort(Link outgoingLink_) Constructor for the inner class.

Method Summary

Methods

Modifier and Type	Method and Description
protected double	calculateMismatchRatio(Link incomingLink_) Helper method to calculate the mismatch ratio of an incoming and the outgoing link as:
(package private) void	handleIncomingPacket(NetworkElement source_, Packet receivedPacket_) Handles an incoming packet that is heading out on this output port.
(package private) void	transmitPackets() Transmits packets on the outgoing link.
(package private) void	updateMaxMismatchRatios(java.util.Collection<Link> allLinks_) Calculates the maximum mismatch ratio for the associated outgoing link relative to all other (incoming) links.

Methods inherited from class java.lang.Object

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

Field Detail

maxMismatchRatio

double maxMismatchRatio

Mismatch ratio of transmission speeds between the input and output links of this router. For example, a mismatch ratio of 10 means that the input link can transmit packets ten time faster than the output link. Because of this, the packets arriving at the router must enter the queue and wait for their turn for transmission on the output link. The default assumption is no mismatch (value 1.0), meaning that packets simply pass through the router without buffering.

mismatchCount

double mismatchCount

Counts how many packets to receive before one can be sent if the outgoing link is slower than incoming links.
Different increments may be associated with different incoming links.

See Also:

handleIncomingPacket(NetworkElement, Packet)

outgoingLink

Link outgoingLink

The outgoing link associated with this output port.

packetInTransmission

Packet packetInTransmission

Holds the packet currently in transmission on the outgoing link. The packet will be handed over to its outgoing link when signaled

Constructor Detail

Router.OutputPort

Router.OutputPort(Link outgoingLink_)

Constructor for the inner class.

Parameters:

outgoingLink_ - the outgoing link with which this output port will be associated

Method Detail

calculateMismatchRatio

protected double calculateMismatchRatio(Link incomingLink_)

Helper method to calculate the mismatch ratio of an incoming and the outgoing link as:

 outgoingLinkTransmissionTime / incomingLinkTransmissionTime 

Parameters:

incomingLink_ - incoming link to compare to

Returns:

the calculated mismatch ratio

handleIncomingPacket

void handleIncomingPacket(NetworkElement source_,
                        Packet receivedPacket_)

Handles an incoming packet that is heading out on this output port. The port can hold only the packet currently in transmission. Any other packets heading on this outgoing link must be queued in the router's memory, if the space permits. Otherwise, the packet will be dropped. Therefore, this method implements the drop-tail queue management policy.

Parameters:

source_ - the communication link through which the packet arrived

receivedPacket_ - the packet that arrived on an incoming link

transmitPackets

void transmitPackets()

Transmits packets on the outgoing link. Should be called only when the time is right.

See Also:

Router.process(int)

updateMaxMismatchRatios

void updateMaxMismatchRatios(java.util.Collection<Link> allLinks_)

Calculates the maximum mismatch ratio for the associated outgoing link relative to all other (incoming) links.

Parameters:

allLinks_ - the list of all other incoming links