model/fw/green-yellow-red.cc

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 University of California, Los Angeles
 *
 * 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:  Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 *          Ilya Moiseenko <iliamo@cs.ucla.edu>
 */

#include "green-yellow-red.h"

#include "ns3/ndn-pit.h"
#include "ns3/ndn-pit-entry.h"
#include "ns3/ndn-interest-header.h"
#include "ns3/ndn-content-object-header.h"
#include "ns3/ndn-pit.h"
#include "ns3/ndn-fib.h"
#include "ns3/ndn-content-store.h"

#include "ns3/assert.h"
#include "ns3/ptr.h"
#include "ns3/log.h"
#include "ns3/simulator.h"
#include "ns3/boolean.h"
#include "ns3/string.h"

#include <boost/ref.hpp>
#include <boost/foreach.hpp>
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>
#include <boost/tuple/tuple.hpp>
namespace ll = boost::lambda;

NS_LOG_COMPONENT_DEFINE ("ndn.fw.GreenYellowRed");

namespace ns3 {
namespace ndn {
namespace fw {

NS_OBJECT_ENSURE_REGISTERED (GreenYellowRed);

TypeId
GreenYellowRed::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::ndn::fw::GreenYellowRed")
    .SetGroupName ("Ndn")
    .SetParent<Nacks> ()

    ;
  return tid;
}

bool
GreenYellowRed::DoPropagateInterest (const Ptr<Face> &incomingFace,
                                     Ptr<InterestHeader> header,
                                     const Ptr<const Packet> &packet,
                                     Ptr<pit::Entry> pitEntry)
{
  NS_LOG_FUNCTION (this);
  NS_ASSERT_MSG (m_pit != 0, "PIT should be aggregated with forwarding strategy");

  int propagatedCount = 0;
  
  BOOST_FOREACH (const fib::FaceMetric &metricFace, pitEntry->GetFibEntry ()->m_faces.get<fib::i_metric> ())
    {
      if (metricFace.m_status == fib::FaceMetric::NDN_FIB_RED ||
          metricFace.m_status == fib::FaceMetric::NDN_FIB_YELLOW)
        break; //propagate only to green faces

      if (pitEntry->GetIncoming ().find (metricFace.m_face) != pitEntry->GetIncoming ().end ()) 
        continue; // don't forward to face that we received interest from

      if (!WillSendOutInterest (metricFace.m_face, header, pitEntry))
        {
          continue;
        }

      //transmission
      Ptr<Packet> packetToSend = packet->Copy ();
      metricFace.m_face->Send (packetToSend);

      DidSendOutInterest (metricFace.m_face, header, packet, pitEntry);
      
      propagatedCount++;
      break; // propagate only one interest
    }

  return propagatedCount > 0;
}

void
GreenYellowRed::WillSatisfyPendingInterest (const Ptr<Face> &incomingFace,
                                            Ptr<pit::Entry> pitEntry)
{
  if (incomingFace != 0)
    {
      // Update metric status for the incoming interface in the corresponding FIB entry
      pitEntry->GetFibEntry ()->UpdateStatus (incomingFace, fib::FaceMetric::NDN_FIB_GREEN);
    }

  super::WillSatisfyPendingInterest (incomingFace, pitEntry);
}

void
GreenYellowRed::DidReceiveValidNack (const Ptr<Face> &incomingFace,
                                     uint32_t nackCode,
                                     Ptr<pit::Entry> pitEntry)
{
  super::DidReceiveValidNack (incomingFace, nackCode, pitEntry);

  if (incomingFace != 0 &&
      nackCode != InterestHeader::NACK_LOOP)
    {
      pitEntry->GetFibEntry ()->UpdateStatus (incomingFace, fib::FaceMetric::NDN_FIB_YELLOW);
    }
}


} // namespace fw
} // namespace ndn
} // namespace ns3