/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2018,  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_UNICAST_UDP_TRANSPORT_HPP
#define NFD_DAEMON_FACE_UNICAST_UDP_TRANSPORT_HPP

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

namespace nfd {
namespace face {

NFD_LOG_MEMBER_DECL_SPECIALIZED((DatagramTransport<boost::asio::ip::udp, Unicast>));

/**
 * \brief A Transport that communicates on a unicast UDP socket
 */
class UnicastUdpTransport final : public DatagramTransport<boost::asio::ip::udp, Unicast>
{
public:
  UnicastUdpTransport(protocol::socket&& socket,
                      ndn::nfd::FacePersistency persistency,
                      time::nanoseconds idleTimeout,
                      optional<ssize_t> overrideMtu = {});

protected:
  bool
  canChangePersistencyToImpl(ndn::nfd::FacePersistency newPersistency) const final;

  void
  afterChangePersistency(ndn::nfd::FacePersistency oldPersistency) final;

private:
  void
  scheduleClosureWhenIdle();

private:
  const time::nanoseconds m_idleTimeout;
  scheduler::ScopedEventId m_closeIfIdleEvent;
};

} // namespace face
} // namespace nfd

#endif // NFD_DAEMON_FACE_UNICAST_UDP_TRANSPORT_HPP