DevPkt Class Reference

The Packet Device class. More...

#include <devPkt.h>

Inherits DEDevice.

Inheritance diagram for DevPkt:

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[legend]List of all members.

Public Member Functions
void	Initialize ()
	Initialize function.
	DevPkt (DESystem *_System, DevPktGen *_thePktGen, DevAP *_theAP, int _ID)
	Contructor.
virtual const char *	Type () const
	This will allow the events and such to print debugging informations in a meaningful way.
void	HEv_Pkt_Feedback (int type)
	Handler for the Ev_Pkt_Feedback event.
Static Public Member Functions
void	setup (ParamManager *Param, GlobalProbeManager *Results)
	Setup function, where the parameters are defined.
Protected Attributes
int	ID
	ID of the device, useful for debugging purposes.
DevAP *	theAP
	The Access Point.
DevPktGen *	thePktGen
	The DevPkt generator.
double	meanWaitingSlots
	Mean waiting time (in slots) before a retransmission.
DETime	generationTime
	The packet generation time.
int	attempt_counter
	The number of transmission attemts.
ProbeHistogram *	theTxTimeProbeHist
	Probe for the time of transmission of a packet.
ProbeHistogram *	theTxAttemptsProbeHist
	Probe for the transmission attemts.

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Detailed Description

The Packet Device class.

This class send a packet to the DevAP, wait for the ACK/NACK and eventually send it again.

Definition at line 31 of file devPkt.h.

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Constructor & Destructor Documentation

DevPkt::DevPkt (  DESystem *  _System, DevPktGen *  _thePktGen, DevAP *  _theAP, int  _ID )

Contructor. Remember to clear variables for initialization in Initialize(). Do NOT initialize variables here unless they are constants. Definition at line 20 of file devPkt.cpp. References theTxAttemptsProbeHist, and theTxTimeProbeHist. : DEDevice(_System), thePktGen(_thePktGen), theAP(_theAP), ID(_ID), attempt_counter(1) { theTxTimeProbeHist = 0; theTxAttemptsProbeHist = 0; };

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Member Function Documentation

void DevPkt::HEv_Pkt_Feedback (  int  type  )

Handler for the Ev_Pkt_Feedback event. The feedback (ACK/NACK) is received here. If we get an ACK, some measures are done and the instance is deleted. Otherwise the packet is rescheduled for another transmission attempt at the right time (again, a synchronization is due). Definition at line 73 of file devPkt.cpp. References DevPktGen::AddBacklogged(), attempt_counter, meanWaitingSlots, DEDevice::newEvent(), ProbeHistogram::Observe(), DevPktGen::RemoveTerminal(), rndGeometric0(), theAP, thePktGen, theTxAttemptsProbeHist, theTxTimeProbeHist, time_int, and DETime::ToBeginOfTheNextUsefulStep(). { if( type == 0 ) { double foo = *T-generationTime; theTxTimeProbeHist->Observe(foo); theTxAttemptsProbeHist->Observe(attempt_counter); thePktGen->RemoveTerminal(this); delete this; } else { thePktGen->AddBacklogged(); attempt_counter++; DETime foo = DETime( time_int(rndGeometric0(meanWaitingSlots)), time_int(0), time_int(0)); newEvent(new Ev_AP_Packet_Arrival(theAP, this), foo + T->ToBeginOfTheNextUsefulStep() ); } }

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void DevPkt::Initialize (   )  [virtual]

Initialize function. Here is where the parameters are read and the real initialization takes place. Note (again) that this function can be called multiple times; hence, you must clear previous instances. Here we send the packet to the Access Pointer the first time. Since we cannot be sure to be at the start of a slot, we send it with a delay corresponding to this difference. I.e., we do a small synchronization. About the theTxTimeProbeHist, we set its bin to a nonstandard value to allow a meaningful measure. Reimplemented from DEDevice. Definition at line 48 of file devPkt.cpp. References DETime::BeginOfTheNextUsefulStep(), generationTime, meanWaitingSlots, DEDevice::newEvent(), theAP, theTxAttemptsProbeHist, theTxTimeProbeHist, and time_int. Referenced by DevPktGen::HEv_PktGen_Generation(), and DevPktGen::Initialize(). { meanWaitingSlots = get<DoubleParameter,double>(Param, "meanWaitingSlots", "Dev_Test_Pkt", ""); DETime oneSlot = DETime(time_int(1), time_int(0), time_int(0)); if( theTxTimeProbeHist ) delete( theTxTimeProbeHist ); theTxTimeProbeHist = Results->getGlobalProbeHistogram("TxTime", double(oneSlot)); if( theTxAttemptsProbeHist ) delete( theTxAttemptsProbeHist ); theTxAttemptsProbeHist = Results->getGlobalProbeHistogram("TxAttempts"); generationTime = T->BeginOfTheNextUsefulStep(); newEvent(new Ev_AP_Packet_Arrival(theAP, this), T->ToBeginOfTheNextUsefulStep()); }

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

• devPkt.h
• devPkt.cpp

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