urv.olsr.message.generator
Class TcMessageGenerator

java.lang.Object
  urv.olsr.message.generator.TcMessageGenerator

public class TcMessageGenerator
extends java.lang.Object

In order to build the topology information base, each node, which has been selected as MPR, broadcasts Topology Control (TC) messages. TC messages are flooded to all nodes in the network and take advantage of MPRs. MPRs enable a better scalability in the distribution of topology information [1]. The list of addresses can be partial in each TC message (e.g., due to message size limitations, imposed by the network), but parsing of all TC messages describing the advertised link set of a node MUST be complete within a certain refreshing period (TC_INTERVAL). The information diffused in the network by these TC messages will help each node calculate its routing table. When the advertised link set of a node becomes empty, this node SHOULD still send (empty) TC-messages during the a duration equal to the "validity time" (typically, this will be equal to TOP_HOLD_TIME) of its previously emitted TC-messages, in order to invalidate the previous TC-messages. It SHOULD then stop sending TC-messages until some node is inserted in its advertised link set. A node MAY transmit additional TC-messages to increase its reactiveness to link failures. When a change to the MPR selector set is detected and this change can be attributed to a link failure, a TC-message SHOULD be transmitted after an interval shorter than TC_INTERVAL.

Author:

Gerard Paris Aixala

Constructor Summary

TcMessageGenerator(OLSRMessageSender messageSender, MprSelectorSet mprSelectorSet, OLSRPacketFactory olsrPacketFactory, MulticastGroupsTable multicastGroupsTable, OLSRNode localNode)

Method Summary

void	generateAndSend()

Methods inherited from class java.lang.Object

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

Constructor Detail

TcMessageGenerator

public TcMessageGenerator(OLSRMessageSender messageSender,
                          MprSelectorSet mprSelectorSet,
                          OLSRPacketFactory olsrPacketFactory,
                          MulticastGroupsTable multicastGroupsTable,
                          OLSRNode localNode)

Method Detail

generateAndSend

public void generateAndSend()