urv.olsr.handlers
Class HelloMessageHandler

java.lang.Object
  urv.olsr.handlers.HelloMessageHandler

public class HelloMessageHandler
extends java.lang.Object

This class is in charge of performing all needed actions when a new HelloMessage is received Tables (Mpr,MprSelector,Neighbour of Neighbours) are updated when a new message is received MPR computation is asked to be performed again when a neighbor becomes symmetric neighbor or we add a new two-hop neighbor OnTableChange is invoked when a new entry is added to the neighbor table or when there are new NoNs The "Originator Address" of a HELLO message is the main address of the node, which has emitted the message. Upon receiving a HELLO message from a symmetric neighbor, a node SHOULD update its 2-hop Neighbor Set. Notice, that a HELLO message MUST neither be forwarded nor be recorded in the duplicate set. Upon receiving a HELLO message, the "validity time" MUST be computed from the Vtime field of the message header (see section 3.3.2). If the Originator Address is the main address of a L_neighbor_iface_addr from a link tuple included in the Link Set with L_SYM_time >= current time (not expired) (in other words: if the Originator Address is a symmetric neighbor) then the 2-hop Neighbor Set SHOULD be updated as follows: 1 for each address (henceforth: 2-hop neighbor address), listed in the HELLO message with Neighbor Type equal to SYM_NEIGH or MPR_NEIGH: 1.1 if the main address of the 2-hop neighbor address = main address of the receiving node: silently discard the 2-hop neighbor address. (in other words: a node is not its own 2-hop neighbor). 1.2 Otherwise, a 2-hop tuple is created with: N_neighbor_main_addr = Originator Address; N_2hop_addr = main address of the 2-hop neighbor; N_time = current time + validity time. This tuple may replace an older similar tuple with same N_neighbor_main_addr and N_2hop_addr values. 2 For each 2-hop node listed in the HELLO message with Neighbor Type equal to NOT_NEIGH, all 2-hop tuples where: N_neighbor_main_addr == Originator Address AND N_2hop_addr == main address of the 2-hop neighbor are deleted.

Author:

Marcel Arrufat Arias

Field Summary

protected org.apache.commons.logging.Log

log

Constructor Summary

HelloMessageHandler(NeighborTable neighborTable, OLSRNode localNode)
The Handler will update Neighbor table depending on the HELLO messages received

Method Summary

void	handleHelloMessage(OLSRNode source, HelloMessage helloMessage, ValidityTime vTime) Updates neighborTable with the new information coming from this message
void	registerMprSelectorSet(MprSelectorSet mprSelectorSet)

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final org.apache.commons.logging.Log log

Constructor Detail

HelloMessageHandler

public HelloMessageHandler(NeighborTable neighborTable,
                           OLSRNode localNode)

The Handler will update Neighbor table depending on the HELLO messages received

Parameters:

neighborTable -

localNode -

Method Detail

handleHelloMessage

public void handleHelloMessage(OLSRNode source,
                               HelloMessage helloMessage,
                               ValidityTime vTime)

Updates neighborTable with the new information coming from this message

Parameters:

source - the node that send the Hello Message

helloMessage - the Hello Message

vTime - message validity time (in seconds)

registerMprSelectorSet

public void registerMprSelectorSet(MprSelectorSet mprSelectorSet)