Flood Class Reference
[netwLayer - network layer modules]

A simple flooding protocol. More...

#include <Flood.h>

Inherits SimpleNetwLayer.

Inheritance diagram for Flood:

[legend]Collaboration diagram for Flood:

[legend]List of all members.

Public Member Functions
	Module_Class_Members (Flood, SimpleNetwLayer, 0)
virtual void	initialize (int)
	Initialization of omnetpp.ini parameters.
virtual void	finish ()
Protected Types
typedef std::list< Bcast >	cBroadcastList
Protected Member Functions
virtual void	handleUpperMsg (cMessage *)
	Handle messages from upper layer.
virtual void	handleLowerMsg (cMessage *)
	Handle messages from lower layer.
virtual void	handleSelfMsg (cMessage *msg)
	we have no self messages
bool	notBroadcasted (NetwPkt *)
	Checks whether a message was already broadcasted.
Protected Attributes
unsigned long	seqNum
	Network layer sequence number.
int	defaultTtl
	Default time-to-live (ttl) used for this module.
bool	plainFlooding
	Defines whether to use plain flooding or not.
cBroadcastList	bcMsgs
	List of already broadcasted messages.
unsigned int	bcMaxEntries
	Max number of entries in the list of already broadcasted messages.
double	bcDelTime
	Time after which an entry for an already broadcasted msg can be deleted.
Classes
class	Bcast

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Detailed Description

A simple flooding protocol.

This implementation uses plain flooding, i.e. it "remembers" (stores) already broadcasted messages in a list and does not rebroadcast them again, if it gets another copy of that message.

The maximum number of entires for that list can be defined in the .ini file (bcMaxEntries) as well as the time after which an entry is deleted (bcDelTime).

If you prefere a memory-less version you can comment out the

#define PLAINFLOODING 

Author:

Daniel Willkomm

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Member Function Documentation

void Flood::handleLowerMsg (  cMessage *  m  )  [protected, virtual]

Handle messages from lower layer. Messages from the mac layer will be forwarded to the application only if the are broadcast or destined for this node. If the arrived message is a broadcast message it is also reflooded only if the tll field is bigger than one. Before the message is handed back to the mac layer the ttl field is reduced by one to account for this hop. In the case of plain flooding the message will only be processed if there is no corresponding entry in the bcMsgs list (notBroadcasted). Otherwise the message will be deleted. Reimplemented from SimpleNetwLayer.

void Flood::handleUpperMsg (  cMessage *  m  )  [protected, virtual]

Handle messages from upper layer. All messages have to get a sequence number and the ttl filed has to be specified. Afterwards the messages can be handed to the mac layer. The mac address is set to -1 (broadcast address) because the message is flooded (i.e. has to be send to all neighbors) In the case of plain flooding the message sequence number and source address has also be stored in the bcMsgs list, so that this message will not be rebroadcasted, if a copy will be flooded back from the neigbouring nodes. If the maximum number of entries is reached the first (oldest) entry is deleted. Reimplemented from SimpleNetwLayer.

void Flood::initialize (  int  stage  )  [virtual]

Initialization of omnetpp.ini parameters. Reads all parameters from the ini file. If a parameter is not specified in the ini file a default value will be set. Reimplemented from SimpleNetwLayer.

bool Flood::notBroadcasted (  NetwPkt *  msg  )  [protected]

Checks whether a message was already broadcasted. The bcMsgs list is searched for the arrived message. If the message is in the list, it was already broadcasted and the function returns false. Concurrently all outdated (older than bcDelTime) are deleted. If the list is full and a new message has to be entered, the oldest entry is deleted.

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The documentation for this class was generated from the following files:

• Flood.h
• Flood.cc

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