link-service.hpp

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

#include "core/counter.hpp"
#include "transport.hpp"
#include "face-log.hpp"

namespace nfd {
namespace face {

class Face;

class LinkServiceCounters
{
public:
  PacketCounter nInInterests;

  PacketCounter nOutInterests;

  PacketCounter nInData;

  PacketCounter nOutData;

  PacketCounter nInNacks;

  PacketCounter nOutNacks;
};

class LinkService : protected virtual LinkServiceCounters, noncopyable
{
public:
  typedef LinkServiceCounters Counters;

public:
  LinkService();

  virtual
  ~LinkService();

  void
  setFaceAndTransport(Face& face, Transport& transport);

  const Face*
  getFace() const;

  const Transport*
  getTransport() const;

  Transport*
  getTransport();

  virtual const Counters&
  getCounters() const;

public: // upper interface to be used by forwarding
  void
  sendInterest(const Interest& interest);

  void
  sendData(const Data& data);

  void
  sendNack(const ndn::lp::Nack& nack);

  signal::Signal<LinkService, Interest> afterReceiveInterest;

  signal::Signal<LinkService, Data> afterReceiveData;

  signal::Signal<LinkService, lp::Nack> afterReceiveNack;

public: // lower interface to be invoked by Transport
  void
  receivePacket(Transport::Packet&& packet);

protected: // upper interface to be invoked in subclass (receive path termination)
  void
  receiveInterest(const Interest& interest);

  void
  receiveData(const Data& data);

  void
  receiveNack(const lp::Nack& nack);

protected: // lower interface to be invoked in subclass (send path termination)
  void
  sendPacket(Transport::Packet&& packet);

private: // upper interface to be overridden in subclass (send path entrypoint)
  virtual void
  doSendInterest(const Interest& interest) = 0;

  virtual void
  doSendData(const Data& data) = 0;

  virtual void
  doSendNack(const lp::Nack& nack) = 0;

private: // lower interface to be overridden in subclass
  virtual void
  doReceivePacket(Transport::Packet&& packet) = 0;

private:
  Face* m_face;
  Transport* m_transport;
};

inline const Face*
LinkService::getFace() const
{
  return m_face;
}

inline const Transport*
LinkService::getTransport() const
{
  return m_transport;
}

inline Transport*
LinkService::getTransport()
{
  return m_transport;
}

inline const LinkService::Counters&
LinkService::getCounters() const
{
  return *this;
}

inline void
LinkService::receivePacket(Transport::Packet&& packet)
{
  doReceivePacket(std::move(packet));
}

inline void
LinkService::sendPacket(Transport::Packet&& packet)
{
  m_transport->send(std::move(packet));
}

std::ostream&
operator<<(std::ostream& os, const FaceLogHelper<LinkService>& flh);

template<typename T>
typename std::enable_if<std::is_base_of<LinkService, T>::value &&
                        !std::is_same<LinkService, T>::value, std::ostream&>::type
operator<<(std::ostream& os, const FaceLogHelper<T>& flh)
{
  return os << FaceLogHelper<LinkService>(flh.obj);
}

} // namespace face
} // namespace nfd

#endif // NFD_DAEMON_FACE_LINK_SERVICE_HPP