notification-stream.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2021 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library 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 Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 */
 
#ifndef NDN_CXX_UTIL_NOTIFICATION_STREAM_HPP
#define NDN_CXX_UTIL_NOTIFICATION_STREAM_HPP
 
#include "ndn-cxx/face.hpp"
#include "ndn-cxx/name.hpp"
#include "ndn-cxx/security/key-chain.hpp"
#include "ndn-cxx/util/concepts.hpp"
 
namespace ndn {
namespace util {
 
template<typename Notification>
class NotificationStream : noncopyable
{
public:
  BOOST_CONCEPT_ASSERT((WireEncodable<Notification>));
 
  NotificationStream(Face& face, const Name& prefix, KeyChain& keyChain)
    : m_face(face)
    , m_prefix(prefix)
    , m_keyChain(keyChain)
    , m_sequenceNo(0)
  {
  }
 
  virtual
  ~NotificationStream() = default;
 
  void
  postNotification(const Notification& notification)
  {
    Name dataName = m_prefix;
    dataName.appendSequenceNumber(m_sequenceNo);
 
    shared_ptr<Data> data = make_shared<Data>(dataName);
    data->setContent(notification.wireEncode());
    data->setFreshnessPeriod(1_s);
 
    m_keyChain.sign(*data);
    m_face.put(*data);
 
    ++m_sequenceNo;
  }
 
private:
  Face& m_face;
  const Name m_prefix;
  KeyChain& m_keyChain;
  uint64_t m_sequenceNo;
};
 
} // namespace util
} // namespace ndn
 
#endif // NDN_CXX_UTIL_NOTIFICATION_STREAM_HPP