Class SwitchPort

java.lang.Object

Layer2Handler

SwitchPort

All Implemented Interfaces:

BitListener

public class SwitchPort
extends Layer2Handler
implements BitListener

This is just like a Layer2Handler, but has no MAC Address. Instead, it represents a port on a switch. It has a portNum representing which port this is on its switch, and it keeps a queue of frames to be sent out when the layer 1 below is ready to receive them. The constructor creates a thread that blocks on the queue, waiting for frames to be added. When a frame is added, the thread wakes up, dequeues the frame and sends it. Frames are added to the queue by the Switch object calling addToOutQ().

Constructor Summary

Constructors

Constructor and Description
SwitchPort(int switchPortNum)
SwitchPort(java.lang.String lightSysHost, int lightSysPort, int switchPortNum)

Method Summary

Modifier and Type	Method and Description
void	addToOutQ(Layer2Frame fr) A caller (a Switch object) can to add a frame to the outgoing queue on this SwitchPort.
int	getPortNum()
java.lang.String	toString()

Methods inherited from class Layer2Handler

bitsReceived, dropReceivedFrame, send, setListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface BitListener

bitsReceived

Constructor Detail

SwitchPort

public SwitchPort(int switchPortNum)

Parameters:

switchPortNum - the port number of this switch port on a Switch.

SwitchPort

public SwitchPort(java.lang.String lightSysHost,
                  int lightSysPort,
                  int switchPortNum)

Parameters:

lightSysHost - the hostname of the machine on which the LightSystem is executing.

lightSysPort - the port the LightSystem is listening on.

switchPortNum - the port number of this switch port on a Switch. This method creates a SwitchPort object, identified by the given switchPortNum. This method creates and executes a thread that waits on the outQ queue for a frame to be inserted. When this happens, the thread dequeues the frame and sends its via the super class's send() method.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getPortNum

public int getPortNum()

addToOutQ

public void addToOutQ(Layer2Frame fr)

A caller (a Switch object) can to add a frame to the outgoing queue on this SwitchPort.