apps.mobile
Class MobileUpdateCapsule

java.lang.Object
  |
  +--ants.core.Capsule
        |
        +--apps.mobile.MobileUpdateCapsule

public class MobileUpdateCapsule

extends Capsule

Mobile update capsule processor - This will update forwarding information on routers so that MobileCapsules can direct themselves to the proper destination

Author:

David Wetherall

Fields inherited from class ants.core.Capsule

MAX_TTL

Constructor Summary

MobileUpdateCapsule()

MobileUpdateCapsule(int dst, int next, int forward)
Construct an update capsule

Method Summary

Xdr	decode() Decode a capsule header from this Capsule's xdr field.
Xdr	encode() Encode this capsule's header into a new Xdr.
boolean	evaluate(Node n) Update the forwarding information on the foreign and home routers.
int	length() Return the length of the capsule header that all capsule encodings will include.

Methods inherited from class ants.core.Capsule

create, encodeCapsuleForSend, findExtension, findMID, findPID, getDst, getPrevious, getSrc, getTTL, prime, setDst, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

MobileUpdateCapsule

public MobileUpdateCapsule()

MobileUpdateCapsule

public MobileUpdateCapsule(int dst,
                           int next,
                           int forward)

Construct an update capsule

Parameters:

dst - The address of the home router

next - The address of the foreign router

forward - The address of the mobile on the foreign network

Method Detail

length

public int length()

Description copied from class: Capsule

Return the length of the capsule header that all capsule encodings will include.

Overrides:

length in class Capsule

Tags copied from class: Capsule

Returns:

the length of the capsule header

encode

public Xdr encode()

Description copied from class: Capsule

Encode this capsule's header into a new Xdr. Return the new Xdr.

Because this header must go first in the Xdr, this encoder unilaterally sets the xdr buffer pointer to the beginning of the buffer and writes its data there.

The format of the Xdr is:

 MethodID         (16 bytes)
 src address      ( 4 bytes)
 dst address      ( 4 bytes)
 previous address ( 4 bytes)
 TTL              ( 4 bytes)
 

Overrides:
encode in class Capsule

Tags copied from class: Capsule

Returns:
the new Xdr representing this capsule.
See Also: 
#xdr

decode

public Xdr decode()

Description copied from class: Capsule

Decode a capsule header from this Capsule's xdr field.

Overrides:

decode in class Capsule

Tags copied from class: Capsule

Returns:

the new Xdr based on the current xdr.

evaluate

public boolean evaluate(Node n)

Update the forwarding information on the foreign and home routers. The MobileCapsules then use this forwarding information to get to the right location.

Overrides:

evaluate in class Capsule

Tags copied from class: Capsule

Parameters:

node - the local node interface

Returns:

an indicationof whether the forwarding was successful.