/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014-2015,  Regents of the University of California,
 *                           Arizona Board of Regents,
 *                           Colorado State University,
 *                           University Pierre & Marie Curie, Sorbonne University,
 *                           Washington University in St. Louis,
 *                           Beijing Institute of Technology,
 *                           The University of Memphis.
 *
 * This file is part of NFD (Named Data Networking Forwarding Daemon).
 * See AUTHORS.md for complete list of NFD authors and contributors.
 *
 * NFD is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * NFD 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
 * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef NFD_DAEMON_FACE_UDP_FACE_HPP
#define NFD_DAEMON_FACE_UDP_FACE_HPP

#include "datagram-face.hpp"
#include "core/scheduler.hpp"

namespace nfd {

/**
 * \brief Implementation of Face abstraction that uses
 *        unicast UDP as underlying transport mechanism
 */
class UdpFace : public DatagramFace<boost::asio::ip::udp>
{
public:
  UdpFace(const FaceUri& remoteUri, const FaceUri& localUri,
          protocol::socket socket, ndn::nfd::FacePersistency persistency,
          const time::seconds& idleTimeout);

  ndn::nfd::FaceStatus
  getFaceStatus() const DECL_OVERRIDE;

private:
  void
  closeIfIdle();

private:
  const time::seconds m_idleTimeout;
  time::steady_clock::TimePoint m_lastIdleCheck;
  scheduler::ScopedEventId m_closeIfIdleEvent;

  // friend because it needs to invoke protected Face::setOnDemand
  friend class UdpChannel;
};

} // namespace nfd

#endif // NFD_DAEMON_FACE_UDP_FACE_HPP