/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2013 University of Washington

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * This is based on double-probe-example.cc.

 *

 * Author: Mitch Watrous (watrous@u.washington.edu)

 */

/*

 * This example is designed to show the main features of an

 * ns3::FileHelper.

 */

#include <string>

#include "ns3/core-module.h"

#include "ns3/stats-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("FileHelperExample");

/*

 * This is our test object, an object that increments counters at

 * various times and emits one of them as a trace source.

 */

class Emitter : public Object

{

public:

  static TypeId GetTypeId (void);

  Emitter ();

private:

  void DoInitialize (void);

  void Emit (void);

  void Count (void);

  TracedValue<double> m_counter;  // normally this would be integer type

  Ptr<ExponentialRandomVariable> m_var;

};

NS_OBJECT_ENSURE_REGISTERED (Emitter);

TypeId

Emitter::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::Emitter")

    .AddConstructor<Emitter> ()

    .SetParent<Object> ()

    .AddTraceSource ("Counter",

                     "sample counter",

                     MakeTraceSourceAccessor (&Emitter::m_counter))

  ;

  return tid;

}

Emitter::Emitter (void)

{

  NS_LOG_FUNCTION (this);

  m_counter = 0;

  m_var = CreateObject<ExponentialRandomVariable> ();

}

void

Emitter::DoInitialize (void)

{

  NS_LOG_FUNCTION (this);

  Simulator::Schedule (Seconds (m_var->GetValue ()), &Emitter::Emit, this);

  Simulator::Schedule (Seconds (m_var->GetValue ()), &Emitter::Count, this);

}

void

Emitter::Emit (void)

{

  NS_LOG_FUNCTION (this);

  NS_LOG_DEBUG ("Emitting at " << Simulator::Now ().GetSeconds ());

  Simulator::Schedule (Seconds (m_var->GetValue ()), &Emitter::Emit, this);

}

void

Emitter::Count (void)

{

  NS_LOG_FUNCTION (this);

  NS_LOG_DEBUG ("Counting at " << Simulator::Now ().GetSeconds ());

  m_counter += 1.0;

  Simulator::Schedule (Seconds (m_var->GetValue ()), &Emitter::Count, this);

}

int main (int argc, char *argv[])

{

  CommandLine cmd;

  cmd.Parse (argc, argv);

  //

  // This Emitter has a trace source object that will emit values at

  // random times.

  //

  Ptr<Emitter> emitter = CreateObject<Emitter> ();

  Names::Add ("/Names/Emitter", emitter);

  //

  // This Probe will be hooked to the Emitter's trace source object by

  // accessing it by path name in the Config database.

  //

  Ptr<DoubleProbe> probe = CreateObject<DoubleProbe> ();

  probe->SetName ("PathProbe");

  Names::Add ("/Names/Probe", probe);

  // Note, no return value is checked here.

  probe->ConnectByPath ("/Names/Emitter/Counter");

  //

  // This file helper will be used to put data values into a file.

  //

  // Create the file helper.

  FileHelper fileHelper;

  // Configure the file to be written.

  fileHelper.ConfigureFile ("file-helper-example",

                            FileAggregator::FORMATTED);

  // Set the labels for this formatted output file.

  fileHelper.Set2dFormat ("Time (Seconds) = %.3e\tCount = %.0f");

  // Write the values generated by the probe.  The path that we

  // provide helps to disambiguate the source of the trace.

  fileHelper.WriteProbe ("ns3::DoubleProbe",

                         "/Names/Probe/Output",

                         "Output");

  // The Emitter object is not associated with an ns-3 node, so

  // it won't get started automatically, so we need to do this ourselves

  Simulator::Schedule (Seconds (0.0), &Emitter::Initialize, emitter);

  Simulator::Stop (Seconds (100.0));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}