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

a forwarding strategy similar to CCNx 0.7.2 More...

#include <ncc-strategy.hpp>

Inheritance diagram for nfd::fw::NccStrategy:
Collaboration diagram for nfd::fw::NccStrategy:

Classes

class  MeasurementsEntryInfo
 StrategyInfo on measurements::Entry. More...
 
class  PitEntryInfo
 StrategyInfo on pit::Entry. More...
 

Public Member Functions

 NccStrategy (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
 

Protected Member Functions

MeasurementsEntryInfogetMeasurementsEntryInfo (measurements::Entry *entry)
 
MeasurementsEntryInfogetMeasurementsEntryInfo (const shared_ptr< pit::Entry > &entry)
 
void doPropagate (FaceId inFaceId, weak_ptr< pit::Entry > pitEntryWeak)
 propagate to another upstream More...
 
void timeoutOnBestFace (weak_ptr< pit::Entry > pitEntryWeak)
 best face did not reply within prediction More...
 
- 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
 

Static Protected Attributes

static const time::microseconds DEFER_FIRST_WITHOUT_BEST_FACE = time::microseconds(4000)
 
static const time::microseconds DEFER_RANGE_WITHOUT_BEST_FACE = time::microseconds(75000)
 
static const int UPDATE_MEASUREMENTS_N_LEVELS = 2
 
static const time::nanoseconds MEASUREMENTS_LIFETIME = time::seconds(16)
 

Additional Inherited Members

- Protected Attributes inherited from nfd::fw::Strategy
signal::Signal< FaceTable, Face & > & afterAddFace
 
signal::Signal< FaceTable, Face & > & beforeRemoveFace
 

Detailed Description

a forwarding strategy similar to CCNx 0.7.2

Definition at line 36 of file ncc-strategy.hpp.

Constructor & Destructor Documentation

◆ NccStrategy()

nfd::fw::NccStrategy::NccStrategy ( Forwarder forwarder,
const Name name = STRATEGY_NAME 
)
explicit

Member Function Documentation

◆ afterReceiveInterest()

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

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
Warning
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 ncc-strategy.cpp.

References nfd::fw::NccStrategy::PitEntryInfo::bestFaceTimeout, nfd::fw::canForwardToLegacy(), DEFER_FIRST_WITHOUT_BEST_FACE, DEFER_RANGE_WITHOUT_BEST_FACE, doPropagate(), nfd::fw::NccStrategy::MeasurementsEntryInfo::getBestFace(), nfd::face::Face::getId(), getMeasurementsEntryInfo(), nfd::fib::Entry::getNextHops(), nfd::fib::Entry::hasNextHop(), nfd::fw::hasPendingOutRecords(), nfd::fw::Strategy::lookupFib(), nfd::fw::NccStrategy::PitEntryInfo::maxInterval, nfd::fw::NccStrategy::MeasurementsEntryInfo::prediction, nfd::fw::NccStrategy::MeasurementsEntryInfo::previousFace, nfd::fw::NccStrategy::PitEntryInfo::propagateTimer, nfd::fw::Strategy::rejectPendingInterest(), nfd::scheduler::schedule(), nfd::fw::Strategy::sendInterest(), timeoutOnBestFace(), and nfd::fw::wouldViolateScope().

◆ beforeSatisfyInterest()

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

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.

Warning
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 195 of file ncc-strategy.cpp.

References nfd::fw::NccStrategy::PitEntryInfo::bestFaceTimeout, nfd::scheduler::cancel(), nfd::measurements::MeasurementsAccessor::extendLifetime(), nfd::measurements::MeasurementsAccessor::get(), nfd::fw::NccStrategy::MeasurementsEntryInfo::getBestFace(), nfd::fw::Strategy::getMeasurements(), getMeasurementsEntryInfo(), nfd::measurements::MeasurementsAccessor::getParent(), MEASUREMENTS_LIFETIME, nfd::fw::NccStrategy::PitEntryInfo::propagateTimer, UPDATE_MEASUREMENTS_N_LEVELS, and nfd::fw::NccStrategy::MeasurementsEntryInfo::updateBestFace().

◆ getMeasurementsEntryInfo() [1/2]

◆ getMeasurementsEntryInfo() [2/2]

NccStrategy::MeasurementsEntryInfo & nfd::fw::NccStrategy::getMeasurementsEntryInfo ( const shared_ptr< pit::Entry > &  entry)
protected

◆ doPropagate()

◆ timeoutOnBestFace()

Member Data Documentation

◆ STRATEGY_NAME

const Name nfd::fw::NccStrategy::STRATEGY_NAME
static

Definition at line 132 of file ncc-strategy.hpp.

◆ DEFER_FIRST_WITHOUT_BEST_FACE

const time::microseconds nfd::fw::NccStrategy::DEFER_FIRST_WITHOUT_BEST_FACE = time::microseconds(4000)
staticprotected

Definition at line 135 of file ncc-strategy.hpp.

Referenced by afterReceiveInterest(), and NccStrategy().

◆ DEFER_RANGE_WITHOUT_BEST_FACE

const time::microseconds nfd::fw::NccStrategy::DEFER_RANGE_WITHOUT_BEST_FACE = time::microseconds(75000)
staticprotected

Definition at line 136 of file ncc-strategy.hpp.

Referenced by afterReceiveInterest(), and NccStrategy().

◆ UPDATE_MEASUREMENTS_N_LEVELS

const int nfd::fw::NccStrategy::UPDATE_MEASUREMENTS_N_LEVELS = 2
staticprotected

Definition at line 137 of file ncc-strategy.hpp.

Referenced by beforeSatisfyInterest(), and timeoutOnBestFace().

◆ MEASUREMENTS_LIFETIME

const time::nanoseconds nfd::fw::NccStrategy::MEASUREMENTS_LIFETIME = time::seconds(16)
staticprotected

Definition at line 138 of file ncc-strategy.hpp.

Referenced by beforeSatisfyInterest(), NccStrategy(), and timeoutOnBestFace().


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