simnet
Class RIPRoutingTable

java.lang.Object
  simnet.RoutingTable
      simnet.RIPRoutingTable

All Implemented Interfaces:

Pluggable, PlugoutListener, java.lang.Runnable

public class RIPRoutingTable

extends RoutingTable

implements java.lang.Runnable, Pluggable

An implementation of the Routing Information Protocol (RIP). On routers, a RIP "daemon" will be run, but on hosts, all packets are forwarded to the host's gateway.

Nested Class Summary

(package private) class

RIPRoutingTable.RIPTimerTask Inner class used to periodically send RIP Advertisments.

Field Summary

static int	INFINITY
(package private) long	last_start
(package private) long	last_update
(package private) int	msg_count
static int	NORMAL_UPDATE_DELAY How often (in ms) to send out advertisments.
protected java.util.LinkedList	queue
static int	REPORT_STABLE_DELAY
(package private) Trie	routeTrie
protected boolean	sending_update
(package private) DatagramSocket	sock
(package private) java.util.Timer	timer
(package private) RIPRoutingTable.RIPTimerTask	timertask
static int	TRIGGERED_UPDATE_DELAY How long to wait (in ms) before sending out a triggered update.

Fields inherited from class simnet.RoutingTable

node, NODE_ID

Constructor Summary

RIPRoutingTable()

Method Summary

int	getDist(int to) This is a dirty hack needed for Speed Test (to test how well bandwidth and latency are modelled)
void	initialize(Node parent_node) If we are on a host, just keep a copy the node, if we are on a router, start open a socket and initalize the timer
int	lookup(int to) Determines the ID of the next hop in the path to the specified node.
boolean	prePlugout(java.lang.Object replacement) To clean up, stop the timer and close the socket; the routing table will get copied if appropriate.
void	PrintRoutingTable() Prints the routing table.
void	processMessage(java.lang.Object o) Receive a RIP advertisment message.
protected void	processMessageNow(java.lang.Object o) Process a RIP advertisment message right now.
void	prt() Prints the routing table.
(package private) void	reportTime() For debugging, print out how long it took for the routing table to converge.
void	run() Receives RIP advertisments.
(package private) void	updateTime() For debugging, keep track of convergence status.

Methods inherited from class simnet.RoutingTable

finalize, plugoutNotification

Methods inherited from class java.lang.Object

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

Field Detail

routeTrie

Trie routeTrie

timer

java.util.Timer timer

timertask

RIPRoutingTable.RIPTimerTask timertask

sock

DatagramSocket sock

last_update

long last_update

last_start

long last_start

REPORT_STABLE_DELAY

public static final int REPORT_STABLE_DELAY

See Also:

Constant Field Values

sending_update

protected boolean sending_update

queue

protected java.util.LinkedList queue

INFINITY

public static final int INFINITY

See Also:

Constant Field Values

NORMAL_UPDATE_DELAY

public static final int NORMAL_UPDATE_DELAY

How often (in ms) to send out advertisments.

See Also:

Constant Field Values

TRIGGERED_UPDATE_DELAY

public static final int TRIGGERED_UPDATE_DELAY

How long to wait (in ms) before sending out a triggered update.

See Also:

Constant Field Values

msg_count

int msg_count

Constructor Detail

RIPRoutingTable

public RIPRoutingTable()

Method Detail

initialize

public void initialize(Node parent_node)

If we are on a host, just keep a copy the node, if we are on a router, start open a socket and initalize the timer

Overrides:

initialize in class RoutingTable

Parameters:

parent_node - the node this routing table will run on

run

public void run()

Receives RIP advertisments.

Specified by:

run in interface java.lang.Runnable

prt

public void prt()

Prints the routing table.

processMessage

public void processMessage(java.lang.Object o)

Receive a RIP advertisment message. If we are currently sending advertisments, queue it, otherwise, process the message now.

processMessageNow

protected void processMessageNow(java.lang.Object o)

Process a RIP advertisment message right now.

reportTime

void reportTime()

For debugging, print out how long it took for the routing table to converge.

updateTime

void updateTime()

For debugging, keep track of convergence status.

lookup

public int lookup(int to)

Determines the ID of the next hop in the path to the specified node.

Specified by:

lookup in class RoutingTable

Parameters:

to - the end of the path

Returns:

the node ID of the next hop

getDist

public int getDist(int to)

This is a dirty hack needed for Speed Test (to test how well bandwidth and latency are modelled)

prePlugout

public boolean prePlugout(java.lang.Object replacement)

To clean up, stop the timer and close the socket; the routing table will get copied if appropriate.

Specified by:

prePlugout in interface Pluggable

Returns:

if this object can now be removed (was the operation sucessful)

PrintRoutingTable

public void PrintRoutingTable()

Prints the routing table.