strategy.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "strategy.hpp"
#include "forwarder.hpp"
#include "core/logger.hpp"

namespace nfd {
namespace fw {

NFD_LOG_INIT("Strategy");

Strategy::Strategy(Forwarder& forwarder, const Name& name)
  : afterAddFace(forwarder.getFaceTable().afterAdd)
  , beforeRemoveFace(forwarder.getFaceTable().beforeRemove)
  , m_name(name)
  , m_forwarder(forwarder)
  , m_measurements(m_forwarder.getMeasurements(),
                   m_forwarder.getStrategyChoice(), *this)
{
}

Strategy::~Strategy()
{
}

void
Strategy::beforeSatisfyInterest(shared_ptr<pit::Entry> pitEntry,
                                const Face& inFace, const Data& data)
{
  NFD_LOG_DEBUG("beforeSatisfyInterest pitEntry=" << pitEntry->getName() <<
    " inFace=" << inFace.getId() << " data=" << data.getName());
}

void
Strategy::beforeExpirePendingInterest(shared_ptr<pit::Entry> pitEntry)
{
  NFD_LOG_DEBUG("beforeExpirePendingInterest pitEntry=" << pitEntry->getName());
}

void
Strategy::afterReceiveNack(const Face& inFace, const lp::Nack& nack,
                           shared_ptr<fib::Entry> fibEntry, shared_ptr<pit::Entry> pitEntry)
{
  NFD_LOG_DEBUG("afterReceiveNack inFace=" << inFace.getId() <<
                " pitEntry=" << pitEntry->getName());
}

void
Strategy::sendNacks(shared_ptr<pit::Entry> pitEntry, const lp::NackHeader& header,
                    std::initializer_list<const Face*> exceptFaces)
{
  // populate downstreams with all downstreams faces
  std::unordered_set<const Face*> downstreams;
  const pit::InRecordCollection& inRecords = pitEntry->getInRecords();
  std::transform(inRecords.begin(), inRecords.end(), std::inserter(downstreams, downstreams.end()),
                 [] (const pit::InRecord& inR) { return inR.getFace().get(); });

  // delete excluded faces
  // .erase in a loop is more efficient than std::set_difference between that requires sorted range
  for (const Face* exceptFace : exceptFaces) {
    downstreams.erase(exceptFace);
  }

  // send Nacks
  for (const Face* downstream : downstreams) {
    this->sendNack(pitEntry, *downstream, header);
  }
  // warning: don't loop on pitEntry->getInRecords(), because InRecord is erased when sending Nack
}

} // namespace fw
} // namespace nfd