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

/*

 * Copyright (c) 2006 INRIA

 *

 * 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

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "ns3/system-wall-clock-ms.h"

#include "ns3/packet.h"

#include "ns3/packet-metadata.h"

#include <iostream>

#include <sstream>

using namespace ns3;

template <int N>

class BenchHeader : public Header

{

public:

  BenchHeader ();

  bool IsOk (void) const;

  static TypeId GetTypeId (void);

  virtual TypeId GetInstanceTypeId (void) const;

  virtual void Print (std::ostream &os) const;

  virtual uint32_t GetSerializedSize (void) const;

  virtual void Serialize (Buffer::Iterator start) const;

  virtual uint32_t Deserialize (Buffer::Iterator start);

private:

  bool m_ok;

};

template <int N>

BenchHeader<N>::BenchHeader ()

  : m_ok (false)

{}

template <int N>

bool 

BenchHeader<N>::IsOk (void) const

{

  return m_ok;

}

template <int N>

TypeId 

BenchHeader<N>::GetTypeId (void)

{

  std::ostringstream oss;

  oss << "ns3::BenchHeader<"<<N<<">";

  static TypeId tid = TypeId (oss.str ().c_str ())

    .SetParent<Header> ()

    ;

  return tid;

}

template <int N>

TypeId 

BenchHeader<N>::GetInstanceTypeId (void) const

{

  return GetTypeId ();

}

template <int N>

void 

BenchHeader<N>::Print (std::ostream &os) const

{

  NS_ASSERT (false);

}

template <int N>

uint32_t 

BenchHeader<N>::GetSerializedSize (void) const

{

  return N;

}

template <int N>

void 

BenchHeader<N>::Serialize (Buffer::Iterator start) const

{

  start.WriteU8 (N, N);

}

template <int N>

uint32_t

BenchHeader<N>::Deserialize (Buffer::Iterator start)

{

  m_ok = true;

  for (int i = 0; i < N; i++)

    {

      if (start.ReadU8 () != N)

        {

          m_ok = false;

        }

    }

  return N;

}

static void 

benchPtrA (uint32_t n)

{

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  for (uint32_t i = 0; i < n; i++) {

    Ptr<Packet> p = Create<Packet> (2000);

    p->AddHeader (udp);

    p->AddHeader (ipv4);

    Ptr<Packet> o = p->Copy ();

    o->RemoveHeader (ipv4);

    o->RemoveHeader (udp);

  }

}

static void 

benchPtrB (uint32_t n)

{

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  for (uint32_t i = 0; i < n; i++) {

    Ptr<Packet> p = Create<Packet> (2000);

    p->AddHeader (udp);

    p->AddHeader (ipv4);

  }

}

static void

ptrC2 (Ptr<Packet> p)

{

  BenchHeader<8> udp;

  p->RemoveHeader (udp);

}

static void 

ptrC1 (Ptr<Packet> p)

{

  BenchHeader<25> ipv4;

  p->RemoveHeader (ipv4);

  ptrC2 (p);

}

static void

benchPtrC (uint32_t n)

{

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  for (uint32_t i = 0; i < n; i++) {

    Ptr<Packet> p = Create<Packet> (2000);

    p->AddHeader (udp);

    p->AddHeader (ipv4);

    ptrC1 (p);

  }

}

#if 0

static void

benchPrint (uint32_t n)

{

  PacketPrinter printer;

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  Ptr<Packet> p = Create<Packet> (2000);

  p->AddHeader (udp);

  p->AddHeader (ipv4);

  for (uint32_t i = 0; i < n; i++) 

    {

      p->Print (std::cerr, printer);

    }  

}

#endif

static void

runBench (void (*bench) (uint32_t), uint32_t n, char const *name)

{

  SystemWallClockMs time;

  time.Start ();

  (*bench) (n);

  unsigned long long deltaMs = time.End ();

  double ps = n;

  ps *= 1000;

  ps /= deltaMs;

  std::cout << name<<"=" << ps << " packets/s" << std::endl;

}

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

{

  uint32_t n = 0;

  while (argc > 0) {

      if (strncmp ("--n=", argv[0],strlen ("--n=")) == 0) 

        {

          char const *nAscii = argv[0] + strlen ("--n=");

          n = atoi (nAscii);

        }

      argc--;

      argv++;

  }

  if (n == 0)

    {

      std::cerr << "Error-- number of packets must be specified " <<

        "by command-line argument --n=(number of packets)" << std::endl;

      exit (1);

    }

  std::cout << "Running bench-packets with n=" << n << std::endl;

  Packet::EnableMetadata ();

  runBench (&benchPtrA, n, "a");

  runBench (&benchPtrB, n, "b");

  runBench (&benchPtrC, n, "c");

  //runBench (&benchPrint, n, "print");

  runBench (&benchPtrA, n, "meta-a");

  runBench (&benchPtrB, n, "meta-b");

  runBench (&benchPtrC, n, "meta-c");

  return 0;

}