NS-3 based Named Data Networking (NDN) simulator
ndnSIM 2.5: NDN, CCN, CCNx, content centric networks
API Documentation
asf-probing-module.hpp
Go to the documentation of this file.
1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2014-2021, Regents of the University of California,
4  * Arizona Board of Regents,
5  * Colorado State University,
6  * University Pierre & Marie Curie, Sorbonne University,
7  * Washington University in St. Louis,
8  * Beijing Institute of Technology,
9  * The University of Memphis.
10  *
11  * This file is part of NFD (Named Data Networking Forwarding Daemon).
12  * See AUTHORS.md for complete list of NFD authors and contributors.
13  *
14  * NFD is free software: you can redistribute it and/or modify it under the terms
15  * of the GNU General Public License as published by the Free Software Foundation,
16  * either version 3 of the License, or (at your option) any later version.
17  *
18  * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
19  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
20  * PURPOSE. See the GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License along with
23  * NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
24  */
25 
26 #ifndef NFD_DAEMON_FW_ASF_PROBING_MODULE_HPP
27 #define NFD_DAEMON_FW_ASF_PROBING_MODULE_HPP
28 
29 #include "asf-measurements.hpp"
30 
31 namespace nfd {
32 namespace fw {
33 namespace asf {
34 
38 {
39 public:
40  explicit
41  ProbingModule(AsfMeasurements& measurements);
42 
43  void
44  scheduleProbe(const fib::Entry& fibEntry, time::milliseconds interval);
45 
46  Face*
47  getFaceToProbe(const Face& inFace, const Interest& interest,
48  const fib::Entry& fibEntry, const Face& faceUsed);
49 
50  bool
51  isProbingNeeded(const fib::Entry& fibEntry, const Name& interestName);
52 
53  void
54  afterForwardingProbe(const fib::Entry& fibEntry, const Name& interestName);
55 
56  void
57  setProbingInterval(size_t probingInterval);
58 
61  {
62  return m_probingInterval;
63  }
64 
65 private:
66  // Used to associate FaceInfo with the face in a NextHop
67  using FaceInfoFacePair = std::pair<FaceInfo*, Face*>;
68 
69  struct FaceInfoCompare
70  {
71  bool
72  operator()(const FaceInfoFacePair& leftPair, const FaceInfoFacePair& rightPair) const
73  {
74  const FaceInfo& lhs = *leftPair.first;
75  const FaceInfo& rhs = *rightPair.first;
76 
77  // Sort by RTT: if a face has timed-out, rank it behind non-timed-out faces
78  return (!lhs.hasTimeout() && rhs.hasTimeout()) ||
79  (lhs.hasTimeout() == rhs.hasTimeout() && lhs.getSrtt() < rhs.getSrtt());
80  }
81  };
82 
83  using FaceInfoFacePairSet = std::set<FaceInfoFacePair, FaceInfoCompare>;
84 
85  static Face*
86  chooseFace(const FaceInfoFacePairSet& rankedFaces);
87 
88  static double
89  getProbingProbability(uint64_t rank, uint64_t rankSum, uint64_t nFaces);
90 
91 public:
92  static constexpr time::milliseconds DEFAULT_PROBING_INTERVAL = 1_min;
93  static constexpr time::milliseconds MIN_PROBING_INTERVAL = 1_s;
94 
95 private:
96  time::milliseconds m_probingInterval;
97  AsfMeasurements& m_measurements;
98 };
99 
100 } // namespace asf
101 } // namespace fw
102 } // namespace nfd
103 
104 #endif // NFD_DAEMON_FW_ASF_PROBING_MODULE_HPP
Helper class to retrieve and create strategy measurements.
void afterForwardingProbe(const fib::Entry &fibEntry, const Name &interestName)
bool isProbingNeeded(const fib::Entry &fibEntry, const Name &interestName)
represents a FIB entry
Definition: fib-entry.hpp:53
ProbingModule(AsfMeasurements &measurements)
Represents an Interest packet.
Definition: interest.hpp:48
static constexpr time::milliseconds MIN_PROBING_INTERVAL
void setProbingInterval(size_t probingInterval)
ndn Face
Definition: face-impl.hpp:42
time::milliseconds getProbingInterval() const
Copyright (c) 2011-2015 Regents of the University of California.
Definition: ndn-common.hpp:39
Represents an absolute name.
Definition: name.hpp:41
Face * getFaceToProbe(const Face &inFace, const Interest &interest, const fib::Entry &fibEntry, const Face &faceUsed)
void scheduleProbe(const fib::Entry &fibEntry, time::milliseconds interval)
Strategy information for each face in a namespace.
static constexpr time::milliseconds DEFAULT_PROBING_INTERVAL
time::nanoseconds getSrtt() const
boost::chrono::milliseconds milliseconds
Definition: time.hpp:48