jist.swans.route
Class RouteZrpIerp.MessageIerp

java.lang.Object
  jist.swans.route.RouteZrpIerp.MessageIerp

All Implemented Interfaces:

JistAPI.Timeless, Message, RouteInterface.Zrp.MessageIerp, RouteInterface.Zrp.MessageZrp

Enclosing class:

RouteZrpIerp

private static class RouteZrpIerp.MessageIerp
extends java.lang.Object
implements RouteInterface.Zrp.MessageIerp

IERP (IntErzone Routing Protocol) packet.

   type (req, rep)               size: 1
   length                        size: 1  -- computed
   node pointer                  size: 1
   RESERVED                      size: 1
   query ID                      size: 2
   RESERVED                      size: 2
   src .. route .. dst           size: 4 * n
  

Field Summary

static int	FIXED_SIZE fixed ierp packet size.
static int	INC_SIZE incremental ierp packet size.
private NetAddress[]	route route.
private short	seq unique source-sequence request identifier.
private byte	type packet type.
static byte	TYPE_RREP ierp packet type constant: reply.
static byte	TYPE_RREQ ierp packet type constant: request.

Fields inherited from interface jist.swans.misc.Message

NULL

Constructor Summary

private	RouteZrpIerp.MessageIerp(byte type, short seq, NetAddress[] route) Create new IERP packet.
	RouteZrpIerp.MessageIerp(short seq, NetAddress dst) Create new IERP route request packet.

Method Summary

RouteZrpIerp.MessageIerp	appendHop(NetAddress nextHop) Create new packet and append hop to packet route.
void	getBytes(byte[] b, int offset) Store packet into byte array.
NetAddress	getDst() Return packet destination address, if available.
short	getID() Return packet identifier, if available.
byte	getLength() Return packet length.
NetAddress[]	getRoute() Return route.
int	getSize() Return packet size or Constants.ZERO_WIRE_SIZE.
NetAddress	getSrc() Return packet source address, if available.
byte	getType() Return packet type.
RouteZrpIerp.MessageIerp	makeReply(NetAddress finder, NetAddress[] routeToDst) Create a reply IERP packet.
private static NetAddress[]	routeAppend(NetAddress[] route, NetAddress nextHop) Helper method: append hop to route.
private static boolean	routeDupCheck(NetAddress[] route) Return whether is a cycle in the route.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

FIXED_SIZE

public static final int FIXED_SIZE

fixed ierp packet size.

See Also:

Constant Field Values

INC_SIZE

public static final int INC_SIZE

incremental ierp packet size.

See Also:

Constant Field Values

TYPE_RREQ

public static final byte TYPE_RREQ

ierp packet type constant: request.

See Also:

Constant Field Values

TYPE_RREP

public static final byte TYPE_RREP

ierp packet type constant: reply.

See Also:

Constant Field Values

type

private byte type

packet type.

seq

private short seq

unique source-sequence request identifier.

route

private NetAddress[] route

route.

Constructor Detail

RouteZrpIerp.MessageIerp

public RouteZrpIerp.MessageIerp(short seq,
                                NetAddress dst)

Create new IERP route request packet.

Parameters:

seq - source-sequence request number

dst - route request destination

RouteZrpIerp.MessageIerp

private RouteZrpIerp.MessageIerp(byte type,
                                 short seq,
                                 NetAddress[] route)

Create new IERP packet.

Parameters:

type - ierp packet type

seq - source-sequence request number

route - route

Method Detail

getType

public byte getType()

Return packet type.

Returns:

packet type

getLength

public byte getLength()

Return packet length.

Returns:

packet length

getID

public short getID()

Return packet identifier, if available.

Specified by:

getID in interface RouteInterface.Zrp.MessageIerp

Returns:

packet identifier

getSrc

public NetAddress getSrc()

Return packet source address, if available.

Specified by:

getSrc in interface RouteInterface.Zrp.MessageIerp

Returns:

packet source address

getDst

public NetAddress getDst()

Return packet destination address, if available.

Specified by:

getDst in interface RouteInterface.Zrp.MessageIerp

Returns:

packet destination address

getRoute

public NetAddress[] getRoute()

Return route.

Returns:

route (do not modify)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getSize

public int getSize()

Return packet size or Constants.ZERO_WIRE_SIZE.

Specified by:

getSize in interface Message

Returns:

packet size

getBytes

public void getBytes(byte[] b,
                     int offset)

Store packet into byte array.

Specified by:

getBytes in interface Message

Parameters:

b - destination byte array

offset - byte array starting offset

routeAppend

private static NetAddress[] routeAppend(NetAddress[] route,
                                        NetAddress nextHop)

Helper method: append hop to route.

Parameters:

route - existing route (source .. route .. destination)

nextHop - next hop to append (before destination)

Returns:

new route

routeDupCheck

private static boolean routeDupCheck(NetAddress[] route)

Return whether is a cycle in the route.

Parameters:

route - route to check for cycle

Returns:

whether there is a cycle in the route

appendHop

public RouteZrpIerp.MessageIerp appendHop(NetAddress nextHop)

Create new packet and append hop to packet route.

Parameters:

nextHop - next hop to append to route

Returns:

new message with next hop appended

makeReply

public RouteZrpIerp.MessageIerp makeReply(NetAddress finder,
                                          NetAddress[] routeToDst)

Create a reply IERP packet.

Parameters:

finder - address of node that found destination

routeToDst - remaining route to destination

Returns:

reply ierp packet