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/* -*- 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 "ccnx-bestroute-strategy.h"
#include "ccnx-interest-header.h"
#include "ccnx-pit.h"
#include "ccnx-pit-entry.h"
#include "ns3/assert.h"
#include "ns3/log.h"
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>
namespace ll = boost::lambda;
NS_LOG_COMPONENT_DEFINE ("CcnxBestRouteStrategy");
namespace ns3
{
using namespace __ccnx_private;
NS_OBJECT_ENSURE_REGISTERED (CcnxBestRouteStrategy);
TypeId CcnxBestRouteStrategy::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::CcnxBestRouteStrategy")
.SetGroupName ("Ccnx")
.SetParent <CcnxForwardingStrategy> ()
.AddConstructor <CcnxBestRouteStrategy> ()
;
return tid;
}
CcnxBestRouteStrategy::CcnxBestRouteStrategy ()
{
}
bool
CcnxBestRouteStrategy::PropagateInterest (const CcnxPitEntry &pitEntry,
const Ptr<CcnxFace> &incomingFace,
Ptr<CcnxInterestHeader> &header,
const Ptr<const Packet> &packet)
{
NS_LOG_FUNCTION (this);
// Try to work out with just green faces
bool greenOk = PropagateInterestViaGreen (pitEntry, incomingFace, header, packet);
if (greenOk)
return true;
int propagatedCount = 0;
BOOST_FOREACH (const CcnxFibFaceMetric &metricFace, pitEntry.m_fibEntry->m_faces.get<i_metric> ())
{
if (metricFace.m_status == CcnxFibFaceMetric::NDN_FIB_RED) // all non-read faces are in front
break;
if (metricFace.m_face == incomingFace)
continue; // same face as incoming, don't forward
if (pitEntry.m_incoming.find (metricFace.m_face) != pitEntry.m_incoming.end ())
continue; // don't forward to face that we received interest from
CcnxPitEntryOutgoingFaceContainer::type::iterator outgoing =
pitEntry.m_outgoing.find (metricFace.m_face);
if (outgoing != pitEntry.m_outgoing.end () &&
outgoing->m_retxCount >= pitEntry.m_maxRetxCount)
{
NS_LOG_ERROR (outgoing->m_retxCount << " >= " << pitEntry.m_maxRetxCount);
continue; // already forwarded before during this retransmission cycle
}
bool faceAvailable = metricFace.m_face->IsBelowLimit ();
if (!faceAvailable) // huh...
{
continue;
}
m_pit->modify (m_pit->iterator_to (pitEntry),
ll::bind(&CcnxPitEntry::AddOutgoing, ll::_1, metricFace.m_face));
Ptr<Packet> packetToSend = packet->Copy ();
//transmission
metricFace.m_face->Send (packetToSend);
m_transmittedInterestsTrace (header, metricFace.m_face);
propagatedCount++;
break; // do only once
}
NS_LOG_INFO ("Propagated to " << propagatedCount << " faces");
return propagatedCount > 0;
}
} //namespace ns3