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	~AccessStrategy ()
virtual void	afterReceiveInterest (const Face &inFace, const Interest &interest, shared_ptr< fib::Entry > fibEntry, shared_ptr< pit::Entry > pitEntry) 1
	trigger after Interest is received More...
virtual void	beforeSatisfyInterest (shared_ptr< pit::Entry > pitEntry, const Face &inFace, const Data &data) 1
	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 Name &	getName () const
	a Name that represent the Strategy program More...
virtual void	beforeExpirePendingInterest (shared_ptr< pit::Entry > pitEntry)
	trigger before PIT entry expires More...
virtual void	afterReceiveNack (const Face &inFace, const lp::Nack &nack, shared_ptr< fib::Entry > fibEntry, 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 (shared_ptr< pit::Entry > pitEntry, shared_ptr< Face > outFace, bool wantNewNonce=false)
	send Interest to outFace More...
void	rejectPendingInterest (shared_ptr< pit::Entry > pitEntry)
	decide that a pending Interest cannot be forwarded More...
void	sendNack (shared_ptr< pit::Entry > pitEntry, const Face &outFace, const lp::NackHeader &header)
	send Nack to outFace More...
void	sendNacks (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...
MeasurementsAccessor &	getMeasurements ()
shared_ptr< Face >	getFace (FaceId id)
const FaceTable &	getFaceTable ()
Protected Attributes inherited from nfd::fw::Strategy
signal::Signal< FaceTable, shared_ptr< Face > > &	afterAddFace
signal::Signal< FaceTable, shared_ptr< 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 37 of file access-strategy.cpp.

~AccessStrategy()

nfd::fw::AccessStrategy::~AccessStrategy ( )

virtual

Definition at line 44 of file access-strategy.cpp.

Member Function Documentation

afterReceiveInterest()

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

virtual

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

Note

The strategy is permitted to store a weak reference to fibEntry. Do not store a shared reference, because FIB entry may be deleted at any moment. fibEntry is passed by value to allow obtaining a weak reference from it.

The strategy is permitted to store a shared reference to pitEntry. pitEntry is passed by value to reflect this fact.

Implements nfd::fw::Strategy.

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

References nfd::fw::RetxSuppressionFixed::decide(), nfd::fw::RetxSuppression::FORWARD, nfd::fw::Strategy::getFace(), nfd::face::INVALID_FACEID, nfd::fw::RetxSuppression::NEW, NFD_LOG_DEBUG, nfd::scheduler::schedule(), nfd::fw::Strategy::sendInterest(), and nfd::fw::RetxSuppression::SUPPRESS.

beforeSatisfyInterest()

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

virtual

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.

Note

The strategy is permitted to store a shared reference to pitEntry. pitEntry is passed by value to reflect this fact.

Reimplemented from nfd::fw::Strategy.

Definition at line 189 of file access-strategy.cpp.

References nfd::MeasurementsAccessor::extendLifetime(), nfd::MeasurementsAccessor::findLongestPrefixMatch(), nfd::MeasurementsAccessor::get(), nfd::fw::Strategy::getMeasurements(), ndn::Data::getName(), ndn::Name::getPrefix(), nfd::face::INVALID_FACEID, ns3::ndn::Name, NFD_LOG_DEBUG, ndn::time::steady_clock::now(), and ndn::Name::size().

Member Data Documentation

STRATEGY_NAME

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

static

Definition at line 166 of file access-strategy.hpp.

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

• ndnSIM/NFD/daemon/fw/access-strategy.hpp
• ndnSIM/NFD/daemon/fw/access-strategy.cpp