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/* -*- 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
*
* 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_FW_NCC_STRATEGY_HPP
#define NFD_DAEMON_FW_NCC_STRATEGY_HPP
#include "strategy.hpp"
namespace nfd {
namespace fw {
/** \brief a forwarding strategy similar to CCNx 0.7.2
*/
class NccStrategy : public Strategy
{
public:
NccStrategy(Forwarder& forwarder, const Name& name = STRATEGY_NAME);
virtual
~NccStrategy();
virtual void
afterReceiveInterest(const Face& inFace,
const Interest& interest,
shared_ptr<fib::Entry> fibEntry,
shared_ptr<pit::Entry> pitEntry);
virtual void
beforeSatisfyPendingInterest(shared_ptr<pit::Entry> pitEntry,
const Face& inFace, const Data& data);
protected:
/// StrategyInfo on measurements::Entry
class MeasurementsEntryInfo : public StrategyInfo
{
public:
MeasurementsEntryInfo();
void
inheritFrom(const MeasurementsEntryInfo& other);
shared_ptr<Face>
getBestFace();
void
updateBestFace(const Face& face);
void
adjustPredictUp();
private:
void
adjustPredictDown();
void
ageBestFace();
public:
weak_ptr<Face> bestFace;
weak_ptr<Face> previousFace;
time::microseconds prediction;
static const time::microseconds INITIAL_PREDICTION;
static const time::microseconds MIN_PREDICTION;
static const int ADJUST_PREDICT_DOWN_SHIFT = 7;
static const time::microseconds MAX_PREDICTION;
static const int ADJUST_PREDICT_UP_SHIFT = 3;
};
/// StrategyInfo on pit::Entry
class PitEntryInfo : public StrategyInfo
{
public:
PitEntryInfo();
virtual
~PitEntryInfo();
public:
bool isNewInterest;
/// timer that expires when best face does not respond within predicted time
EventId bestFaceTimeout;
/// timer for propagating to another face
EventId propagateTimer;
/// maximum interval between forwarding to two nexthops except best and previous
time::microseconds maxInterval;
};
protected:
shared_ptr<MeasurementsEntryInfo>
getMeasurementsEntryInfo(shared_ptr<measurements::Entry> entry);
shared_ptr<MeasurementsEntryInfo>
getMeasurementsEntryInfo(shared_ptr<pit::Entry> entry);
/// propagate to another upstream
void
doPropagate(weak_ptr<pit::Entry> pitEntryWeak, weak_ptr<fib::Entry> fibEntryWeak);
/// best face did not reply within prediction
void
timeoutOnBestFace(weak_ptr<pit::Entry> pitEntryWeak);
public:
static const Name STRATEGY_NAME;
protected:
static const time::microseconds DEFER_FIRST_WITHOUT_BEST_FACE;
static const time::microseconds DEFER_RANGE_WITHOUT_BEST_FACE;
static const int UPDATE_MEASUREMENTS_N_LEVELS = 2;
static const time::nanoseconds MEASUREMENTS_LIFETIME;
};
} // namespace fw
} // namespace nfd
#endif // NFD_DAEMON_FW_NCC_STRATEGY_HPP