asf-probing-module.hpp

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

#include "asf-measurements.hpp"

namespace nfd {
namespace fw {
namespace asf {

class ProbingModule
{
public:
  explicit
  ProbingModule(AsfMeasurements& measurements);

  void
  scheduleProbe(const fib::Entry& fibEntry, const time::milliseconds& interval);

  Face*
  getFaceToProbe(const Face& inFace,
                 const Interest& interest,
                 const fib::Entry& fibEntry,
                 const Face& faceUsed);

  bool
  isProbingNeeded(const fib::Entry& fibEntry, const Interest& interest);

  void
  afterForwardingProbe(const fib::Entry& fibEntry, const Interest& interest);

private:
  // Used to associate FaceInfo with the face in a NextHop
  typedef std::pair<FaceInfo*, Face*> FaceInfoFacePair;
  typedef std::function<bool(FaceInfoFacePair, FaceInfoFacePair)> FaceInfoPredicate;
  typedef std::set<FaceInfoFacePair, FaceInfoPredicate> FaceInfoFacePairSet;

  Face*
  getFaceBasedOnProbability(const FaceInfoFacePairSet& rankedFaces);

  double
  getProbingProbability(uint64_t rank, uint64_t rankSum, uint64_t nFaces);

  double
  getRandomNumber(double start, double end);

public:
  static constexpr time::seconds DEFAULT_PROBING_INTERVAL = time::seconds(60);

private:
  time::seconds m_probingInterval;
  AsfMeasurements& m_measurements;
};

} // namespace asf
} // namespace fw
} // namespace nfd

#endif // NFD_DAEMON_FW_ASF_PROBING_MODULE_HPP