core/notification-stream.hpp

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

#include "common.hpp"

#include <ndn-cxx/encoding/encoding-buffer.hpp>
#include <ndn-cxx/security/key-chain.hpp>

namespace nfd {

/** \brief provides a publisher of Notification Stream
 *  \sa http://redmine.named-data.net/projects/nfd/wiki/Notification
 */
template <class FaceBase>
class NotificationStream : noncopyable
{
public:
  NotificationStream(FaceBase& face, const Name& prefix, ndn::KeyChain& keyChain)
    : m_face(face)
    , m_prefix(prefix)
    , m_keyChain(keyChain)
    , m_sequenceNo(0)
  {
  }

  virtual
  ~NotificationStream()
  {
  }

  template<typename T> void
  postNotification(const T& notification)
  {
    Name dataName = m_prefix;
    dataName.appendSequenceNumber(m_sequenceNo);

    shared_ptr<Data> data = make_shared<Data>(dataName);
    data->setContent(notification.wireEncode());
    data->setFreshnessPeriod(time::seconds(1));

    m_keyChain.sign(*data);
    m_face.put(*data);

    ++m_sequenceNo;
  }

private:
  FaceBase& m_face;
  const Name m_prefix;
  ndn::KeyChain& m_keyChain;
  uint64_t m_sequenceNo;
};

} // namespace nfd

#endif // NFD_CORE_NOTIFICATION_STREAM_HPP