Class Edge

java.lang.Object
  Edge

public class Edge
extends java.lang.Object

   
 Edge stores the specifics about each edge in the topology. 
 Edges can be temporarily disabled and they record when the next packet can be sent along the edge
 

Constructor Summary

Edge(int a, int b, EdgeOptions options)
Create a live edge between nodes a and b

Method Summary

int	getNodeA() Returns node a
int	getNodeB() Returns node b
EdgeOptions	getOptions()
boolean	isEdge(int a, int b)
boolean	isLive()
long	schedulePkt(int src, int size, long now) Figure out when, in microseconds, a packet will arrive at the destination, given a link's bandwidth propogation delay characteristics.
void	setOptions(EdgeOptions options) Sets the options for the edge
void	setState(boolean state) Sets the state of the edge, either live or not live

Methods inherited from class java.lang.Object

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

Constructor Detail

Edge

public Edge(int a,
            int b,
            EdgeOptions options)

Create a live edge between nodes a and b

Parameters:

a - Int specifying a node

b - Int specifying a node

options - The edge options. That is, the delay, the loss rate and the bandwidth

Method Detail

schedulePkt

public long schedulePkt(int src,
                        int size,
                        long now)
                 throws java.lang.IllegalArgumentException

Figure out when, in microseconds, a packet will arrive at the destination, given a link's bandwidth propogation delay characteristics.

Parameters:

src - The src node that wants to send the packet

size - The size of the packet in bytes

now - The current time in microseconds

Returns:

The time (in microseconds) when the next packet will arrive at the destination. Returns -1 if the packet is dropped

Throws:

java.lang.IllegalArgumentException - Thrown if size is greater than Packet.MAX_PACKET_SIZE

isEdge

public boolean isEdge(int a,
                      int b)

Parameters:

a - Int specifying a node

b - Int specifying a node

Returns:

Returns true if this is an edge between a and b

getNodeA

public int getNodeA()

Returns node a

Returns:

The address of node a

getNodeB

public int getNodeB()

Returns node b

Returns:

The address of node b

setState

public void setState(boolean state)

Sets the state of the edge, either live or not live

Parameters:

state - The state of the edge. True means live

isLive

public boolean isLive()

Returns:

True if edge is live

getOptions

public EdgeOptions getOptions()

Returns:

The options of the edge. That is, the loss rate, delay and bandwidth

setOptions

public void setOptions(EdgeOptions options)

Sets the options for the edge

Parameters:

options - The edge options