ncc-strategy.hpp

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

#include "strategy.hpp"

namespace nfd {
namespace fw {

class NccStrategy : public Strategy
{
public:
  explicit
  NccStrategy(Forwarder& forwarder, const Name& name = STRATEGY_NAME);

  virtual void
  afterReceiveInterest(const Face& inFace, const Interest& interest,
                       const shared_ptr<pit::Entry>& pitEntry) override;

  virtual void
  beforeSatisfyInterest(const shared_ptr<pit::Entry>& pitEntry,
                        const Face& inFace, const Data& data) override;

PUBLIC_WITH_TESTS_ELSE_PROTECTED:
  class MeasurementsEntryInfo : public StrategyInfo
  {
  public:
    static constexpr int
    getTypeId()
    {
      return 1000;
    }

    MeasurementsEntryInfo();

    void
    inheritFrom(const MeasurementsEntryInfo& other);

    shared_ptr<Face>
    getBestFace();

    void
    updateBestFace(const Face& face);

    void
    adjustPredictUp();

  private:
    void
    adjustPredictDown();

    void
    ageBestFace();

  public:
    weak_ptr<Face> bestFace;
    weak_ptr<Face> previousFace;
    time::microseconds prediction;

    static const time::microseconds INITIAL_PREDICTION;
    static const time::microseconds MIN_PREDICTION;
    static const int ADJUST_PREDICT_DOWN_SHIFT = 7;
    static const time::microseconds MAX_PREDICTION;
    static const int ADJUST_PREDICT_UP_SHIFT = 3;
  };

  class PitEntryInfo : public StrategyInfo
  {
  public:
    static constexpr int
    getTypeId()
    {
      return 1001;
    }

    virtual
    ~PitEntryInfo() override;

  public:
    scheduler::EventId bestFaceTimeout;
    scheduler::EventId propagateTimer;
    time::microseconds maxInterval;
  };

protected:
  MeasurementsEntryInfo&
  getMeasurementsEntryInfo(measurements::Entry* entry);

  MeasurementsEntryInfo&
  getMeasurementsEntryInfo(const shared_ptr<pit::Entry>& entry);

  void
  doPropagate(weak_ptr<pit::Entry> pitEntryWeak);

  void
  timeoutOnBestFace(weak_ptr<pit::Entry> pitEntryWeak);

public:
  static const Name STRATEGY_NAME;

protected:
  static const time::microseconds DEFER_FIRST_WITHOUT_BEST_FACE;
  static const time::microseconds DEFER_RANGE_WITHOUT_BEST_FACE;
  static const int UPDATE_MEASUREMENTS_N_LEVELS = 2;
  static const time::nanoseconds MEASUREMENTS_LIFETIME;
};

} // namespace fw
} // namespace nfd

#endif // NFD_DAEMON_FW_NCC_STRATEGY_HPP