src/sync-full-state.h

/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2012-2014 University of California, Los Angeles
 *
 * This file is part of ChronoSync, synchronization library for distributed realtime
 * applications for NDN.
 *
 * ChronoSync 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.
 *
 * ChronoSync 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
 * ChronoSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Zhenkai Zhu <http://irl.cs.ucla.edu/~zhenkai/>
 * @author Chaoyi Bian <bcy@pku.edu.cn>
 * @author Alexander Afanasyev <http://lasr.cs.ucla.edu/afanasyev/index.html>
 */

#ifndef SYNC_FULL_STATE_H
#define SYNC_FULL_STATE_H

#include <ndn-cxx/util/time.hpp>
#include "sync-state.h"

namespace Sync {

class FullState;
typedef boost::shared_ptr<FullState> FullStatePtr;
typedef boost::shared_ptr<FullState> FullStateConstPtr;


/**
 * \ingroup sync
 * @brief Cumulative SYNC state
 */
class FullState : public State
{
public:
  /**
   * @brief Default constructor
   */
  FullState ();
  virtual ~FullState ();

  /**
   * @brief Get time period since last state update
   *
   * This value can be used to randomize reconciliation waiting time in SyncApp
   */
  ndn::time::system_clock::Duration
  getTimeFromLastUpdate () const;

  /**
   * @brief Obtain a read-only copy of the digest
   *
   * If m_digest is 0, then it is automatically created.  On every update and removal, m_digest is reset to 0
   */
  DigestConstPtr
  getDigest ();

  // from State
  virtual boost::tuple<bool/*inserted*/, bool/*updated*/, SeqNo/*oldSeqNo*/>
  update (NameInfoConstPtr info, const SeqNo &seq);

  virtual bool
  remove (NameInfoConstPtr info);

private:
  ndn::time::system_clock::TimePoint m_lastUpdated; ///< @brief Time when state was updated last time
  DigestPtr m_digest;
};

} // Sync

#endif // SYNC_STATE_H