NS-3 based Named Data Networking (NDN) simulator
ndnSIM 2.3: NDN, CCN, CCNx, content centric networks
API Documentation
nfd::fw::AccessStrategy Class Reference

Access Router Strategy version 1. More...

#include <access-strategy.hpp>

Inheritance diagram for nfd::fw::AccessStrategy:
Collaboration diagram for nfd::fw::AccessStrategy:

Public Member Functions

 AccessStrategy (Forwarder &forwarder, const Name &name=STRATEGY_NAME)
virtual void afterReceiveInterest (const Face &inFace, const Interest &interest, const shared_ptr< pit::Entry > &pitEntry) override
 trigger after Interest is received More...
virtual void beforeSatisfyInterest (const shared_ptr< pit::Entry > &pitEntry, const Face &inFace, const Data &data) override
 trigger before PIT entry is satisfied More...
- Public Member Functions inherited from nfd::fw::Strategy
 Strategy (Forwarder &forwarder, const Name &name)
 construct a strategy instance More...
virtual ~Strategy ()
const NamegetName () const
virtual void beforeExpirePendingInterest (const shared_ptr< pit::Entry > &pitEntry)
 trigger before PIT entry expires More...
virtual void afterReceiveNack (const Face &inFace, const lp::Nack &nack, const shared_ptr< pit::Entry > &pitEntry)
 trigger after Nack is received More...

Static Public Attributes

static const Name STRATEGY_NAME

Additional Inherited Members

- Protected Member Functions inherited from nfd::fw::Strategy
void sendInterest (const shared_ptr< pit::Entry > &pitEntry, Face &outFace, const Interest &interest)
 send Interest to outFace More...
 DEPRECATED (void sendInterest(const shared_ptr< pit::Entry > &pitEntry, Face &outFace, bool wantNewNonce=false))
 send Interest to outFace More...
void rejectPendingInterest (const shared_ptr< pit::Entry > &pitEntry)
 decide that a pending Interest cannot be forwarded More...
void sendNack (const shared_ptr< pit::Entry > &pitEntry, const Face &outFace, const lp::NackHeader &header)
 send Nack to outFace More...
void sendNacks (const shared_ptr< pit::Entry > &pitEntry, const lp::NackHeader &header, std::initializer_list< const Face *> exceptFaces=std::initializer_list< const Face *>())
 send Nack to every face that has an in-record, except those in exceptFaces More...
const fib::EntrylookupFib (const pit::Entry &pitEntry) const
 performs a FIB lookup, considering Link object if present More...
MeasurementsAccessorgetMeasurements ()
FacegetFace (FaceId id) const
const FaceTablegetFaceTable () const
- Protected Attributes inherited from nfd::fw::Strategy
signal::Signal< FaceTable, Face & > & afterAddFace
signal::Signal< FaceTable, Face & > & beforeRemoveFace

Detailed Description

Access Router Strategy version 1.

This strategy is designed for the last hop on the NDN testbed, where each nexthop connects to a laptop, links are lossy, and FIB is mostly correct.

  1. Multicast the first Interest to all nexthops.
  2. When Data comes back, remember last working nexthop of the prefix; the granularity of this knowledge is the parent of Data Name.
  3. Forward subsequent Interests to the last working nexthop. If it doesn't respond, multicast again.

Definition at line 49 of file access-strategy.hpp.

Constructor & Destructor Documentation

◆ AccessStrategy()

nfd::fw::AccessStrategy::AccessStrategy ( Forwarder forwarder,
const Name name = STRATEGY_NAME 

Definition at line 38 of file access-strategy.cpp.

Member Function Documentation

◆ afterReceiveInterest()

void nfd::fw::AccessStrategy::afterReceiveInterest ( const Face inFace,
const Interest interest,
const shared_ptr< pit::Entry > &  pitEntry 

trigger after Interest is received

The Interest:

  • does not violate Scope
  • is not looped
  • cannot be satisfied by ContentStore
  • is under a namespace managed by this strategy

The strategy should decide whether and where to forward this Interest.

  • If the strategy decides to forward this Interest, invoke this->sendInterest one or more times, either now or shortly after
  • If strategy concludes that this Interest cannot be forwarded, invoke this->rejectPendingInterest so that PIT entry will be deleted shortly
The strategy must not retain shared_ptr<pit::Entry>, otherwise undefined behavior may occur. However, the strategy is allowed to store weak_ptr<pit::Entry>.

Implements nfd::fw::Strategy.

Definition at line 46 of file access-strategy.cpp.

References nfd::fw::RetxSuppressionFixed::decide(), nfd::fw::RetxSuppression::FORWARD, nfd::fw::Strategy::getFace(), nfd::face::Face::getId(), nfd::fib::Entry::getNextHops(), nfd::fib::Entry::hasNextHop(), nfd::face::INVALID_FACEID, nfd::fw::Strategy::lookupFib(), nfd::fw::RetxSuppression::NEW, NFD_LOG_DEBUG, nfd::fw::Strategy::rejectPendingInterest(), nfd::scheduler::schedule(), nfd::fw::Strategy::sendInterest(), nfd::fw::RetxSuppression::SUPPRESS, and nfd::fw::wouldViolateScope().

◆ beforeSatisfyInterest()

void nfd::fw::AccessStrategy::beforeSatisfyInterest ( const shared_ptr< pit::Entry > &  pitEntry,
const Face inFace,
const Data data 

trigger before PIT entry is satisfied

This trigger is invoked when an incoming Data satisfies the PIT entry. It can be invoked even if the PIT entry has already been satisfied.

In this base class this method does nothing.

The strategy must not retain shared_ptr<pit::Entry>, otherwise undefined behavior may occur. However, the strategy is allowed to store weak_ptr<pit::Entry>.

Reimplemented from nfd::fw::Strategy.

Definition at line 202 of file access-strategy.cpp.

References ndn::Name::empty(), nfd::measurements::MeasurementsAccessor::extendLifetime(), nfd::measurements::MeasurementsAccessor::findLongestPrefixMatch(), nfd::measurements::MeasurementsAccessor::get(), nfd::face::Face::getId(), nfd::fw::Strategy::getMeasurements(), nfd::measurements::Entry::getName(), ndn::Data::getName(), ndn::Name::getPrefix(), nfd::StrategyInfoHost::getStrategyInfo(), nfd::StrategyInfoHost::insertStrategyInfo(), nfd::face::INVALID_FACEID, ns3::ndn::Name, NFD_LOG_DEBUG, and ndn::time::steady_clock::now().

Member Data Documentation


const Name nfd::fw::AccessStrategy::STRATEGY_NAME

Definition at line 159 of file access-strategy.hpp.

The documentation for this class was generated from the following files: