simnet
Class UDP

java.lang.Object
  simnet.Transport
      simnet.UDP

All Implemented Interfaces:

Pluggable, PlugoutListener

public class UDP

extends Transport

implements Pluggable

An implementation of the UDP protocol.

Field Summary

java.util.HashSet	availablePorts Added for NAT purposes :-(
protected int	next_port
(package private) java.util.Hashtable	ports
(package private) java.util.HashSet	sockets

Fields inherited from class simnet.Transport

node, NODE_ID, sim

Constructor Summary

UDP()

Method Summary

DatagramSocket	createDatagramSocket(java.lang.Object consumer) Returns a new DatagramSocket using this transport.
void	dump_udp_state() Print out all UDP state information.
(package private) int	getNextFreePort() Return the next available port to bind to, or -1 if there is none.
int	getProtocol() Returns the protocol (id) of this Transport
void	in(int src, Packet packet) In UDP, rawIn does all the work.
void	initialize(Node parent_node) Initializes a new UDP object by setting its ID.
boolean	prePlugout(java.lang.Object replacement) To replace UDP, update all sockets; to remove UDP, close all sockets.
void	rawIn(IP_Packet ipp) Processes incoming packets from the IP stack and forwards the encapsulated data to the appropriate DatagramSocket.
protected void	registerSocket(DatagramSocket sock) When a DatagramSocket gets created, UDP needs to know about it.
(package private) void	unregisterSocket(DatagramSocket sock) When a DatagramSocket gets closed, UDP needs to know about it.

Methods inherited from class simnet.Transport

finalize, plugoutNotification

Methods inherited from class java.lang.Object

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

Field Detail

sockets

java.util.HashSet sockets

ports

java.util.Hashtable ports

next_port

protected int next_port

availablePorts

public java.util.HashSet availablePorts

Added for NAT purposes :-(

Constructor Detail

UDP

public UDP()

Method Detail

initialize

public void initialize(Node parent_node)

Initializes a new UDP object by setting its ID.

Overrides:

initialize in class Transport

Parameters:

parent_node - the Node that owns this Transport

getProtocol

public int getProtocol()

Returns the protocol (id) of this Transport

Specified by:

getProtocol in class Transport

createDatagramSocket

public DatagramSocket createDatagramSocket(java.lang.Object consumer)

Returns a new DatagramSocket using this transport.

rawIn

public void rawIn(IP_Packet ipp)

Processes incoming packets from the IP stack and forwards the encapsulated data to the appropriate DatagramSocket.

Overrides:

rawIn in class Transport

in

public void in(int src,
               Packet packet)

In UDP, rawIn does all the work.

Specified by:

in in class Transport

Parameters:

src - the source of the incoing packet

packet - incoming packet

getNextFreePort

int getNextFreePort()

Return the next available port to bind to, or -1 if there is none.

registerSocket

protected void registerSocket(DatagramSocket sock)

When a DatagramSocket gets created, UDP needs to know about it.

unregisterSocket

void unregisterSocket(DatagramSocket sock)

When a DatagramSocket gets closed, UDP needs to know about it.

dump_udp_state

public void dump_udp_state()

Print out all UDP state information.

prePlugout

public boolean prePlugout(java.lang.Object replacement)

To replace UDP, update all sockets; to remove UDP, close all sockets.

Specified by:

prePlugout in interface Pluggable

Returns:

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