File: packet_generator.cpp

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/*!
 * \file
 * \brief Implementation of a Packet generator class
 * \author Anders Persson and Tony Ottosson
 *
 * -------------------------------------------------------------------------
 *
 * IT++ - C++ library of mathematical, signal processing, speech processing,
 *        and communications classes and functions
 *
 * Copyright (C) 1995-2008  (see AUTHORS file for a list of contributors)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * -------------------------------------------------------------------------
 */

#include <itpp/protocol/packet_generator.h>


namespace itpp {

  Packet_Generator::Packet_Generator(const int Packet_size, const unsigned long int Max_packets){
    keep_running = false;
    start.forward(this, &Packet_Generator::handle_start);
    next.forward(this, &Packet_Generator::handle_next);
    output.connect(&next);
    set_parameters(Packet_size, Max_packets);
  }

  Packet_Generator::~Packet_Generator() { }

  void Packet_Generator::set_parameters(const int Packet_size, const unsigned long int Max_packets){
    it_assert(Packet_size>0,"Packet_Generator::set_parameters(): ");
    packet_size = Packet_size;
    max_packets = Max_packets;
    id = 0;
  }

  int Packet_Generator::get_packet_size(){
    return packet_size;
  }

  int Packet_Generator::get_max_packets(){
    return max_packets;
  }

  void Packet_Generator::handle_next(Packet*){
    if(keep_running){
      output(new Packet(8*packet_size), delta_t());
      id++;
      if(max_packets && id>=max_packets)
	start(false);
    }
  }

  void Packet_Generator::handle_start(const bool run){
    if(run&&!keep_running){
      keep_running = run;
      handle_next(NULL);
    }
    keep_running = run;
  }


  // ---------------------------- Poisson_Packet_Generator -------------------------------------------------

  Poisson_Packet_Generator::Poisson_Packet_Generator(const double Avg_bit_rate,
						     const int Packet_size,
						     const unsigned long int Max_packets):Packet_Generator(Packet_size, Max_packets){
    set_parameters(Avg_bit_rate, Packet_size, Max_packets);
  }

  Poisson_Packet_Generator::~Poisson_Packet_Generator(){}

  void Poisson_Packet_Generator::set_parameters(const double Avg_bit_rate,
						const int Packet_size,
						const unsigned long int Max_packets){
    Packet_Generator::set_parameters(Packet_size, Max_packets);
    it_assert(Avg_bit_rate > 0.0,"Packet_Generator::set_parameters(): ");
    avg_bit_rate = Avg_bit_rate;
    avg_delta_t = 8.0*get_packet_size()/avg_bit_rate;
    ee.setup(1.0);
  }

  double Poisson_Packet_Generator::get_avg_bit_rate(){
    return avg_bit_rate;
  }


  Ttype Poisson_Packet_Generator::delta_t(){
    return ee()*avg_delta_t;
  }


  // ---------------------------- Constant_Rate_Packet_Generator -------------------------------------------------

  Constant_Rate_Packet_Generator::Constant_Rate_Packet_Generator(const double Avg_rate, const int Packet_size, const unsigned long int Max_packets):Poisson_Packet_Generator(Avg_rate, Packet_size, Max_packets){}

  Constant_Rate_Packet_Generator::~Constant_Rate_Packet_Generator(){}

  Ttype Constant_Rate_Packet_Generator::delta_t(){
    return avg_delta_t;
  }


  // ---------------------------- Burst_WWW_Packet_Generator -------------------------------------------------


  Burst_WWW_Packet_Generator::Burst_WWW_Packet_Generator(const double Avg_bit_rate, const int Packet_size, const int Max_packets):Poisson_Packet_Generator(Avg_bit_rate, Packet_size, Max_packets) {
    Navg = 50; // Average number of packets per burst [packets].
    Ti = 1.1960e-4; // Average inter-arrival time between packets in burst [s].
    Tr = Navg*Packet_size*8.0/Avg_bit_rate-Ti*(Navg-1); // Average time between bursts.
    N = 0;
  }

  Burst_WWW_Packet_Generator::~Burst_WWW_Packet_Generator() {

  }

  Ttype Burst_WWW_Packet_Generator::delta_t() {
    if(N==0){ // Start of a new burst.
      N = Navg;
      N--; // First packet is triggered at ...
      return ee()*Tr; // ... start time of next burst.
    }
    else{ // Within a burst.
      N--; // One packet less in the burst ...
      return ee()*Ti; // ... arrival time for next packet within the burst.
    }
  }


  // ----------------------------Sink -------------------------------------------------

  Sink::Sink(const unsigned long int Max_packets){
    it_assert(Max_packets>0,"Sink::Sink(): ");
    max_packets = Max_packets;
    Ncp = 0;
    Nbytes = 0;
    packet_input.forward(this, &Sink::handle_packet_input);
    start_time = Event_Queue::now();
  }

  Sink::~Sink(){
    std::cout << "Time = "<<Event_Queue::now()<<", Sink : " << std::endl;
    std::cout << "Received "<<Ncp<<" packets in sequence." << std::endl;
    std::cout << "Receive average bit rate = "<<Nbytes*8.0/(Event_Queue::now()-start_time)<<" [bits/second]." << std::endl;
  }


  void Sink::handle_packet_input(Packet *P){
    it_assert(P!=NULL,"Sink::handle_packet_input(): ");
    Ncp++;
    Nbytes+=(P->bit_size()/8);
    delete P;
    if(Ncp >= max_packets){
      std::cout << "Time = "<<Event_Queue::now()<<", Sink : " << std::endl;
      std::cout << "Simulation stopped because : Ncp > max_packets" << std::endl;
      Event_Queue::stop();
    }
  }


} // namespace itpp