the lower part of a Face More...

#include <daemon/face/transport.hpp>

Inheritance diagram for nfd::face::Transport:

Collaboration diagram for nfd::face::Transport:

Classes
class	Packet
	stores a packet along with the remote endpoint More...

Public Types
typedef TransportCounters	Counters
	counters provided by Transport More...

typedef uint64_t	EndpointId
	identifies an endpoint on the link More...

Public Member Functions
	Transport ()
	constructor More...

virtual	~Transport ()

bool	canChangePersistencyTo (ndn::nfd::FacePersistency newPersistency) const
	check whether the face persistency can be changed to `newPersistency` More...

void	close ()
	request the transport to be closed More...

virtual const Counters &	getCounters () const

time::steady_clock::TimePoint	getExpirationTime () const

const Face *	getFace () const

const LinkService *	getLinkService () const

LinkService *	getLinkService ()

ndn::nfd::LinkType	getLinkType () const

FaceUri	getLocalUri () const

ssize_t	getMtu () const

ndn::nfd::FacePersistency	getPersistency () const

FaceUri	getRemoteUri () const

ndn::nfd::FaceScope	getScope () const

ssize_t	getSendQueueCapacity () const

virtual ssize_t	getSendQueueLength ()

TransportState	getState () const

void	send (Packet &&packet)
	send a link-layer packet More...

void	setFaceAndLinkService (Face &face, LinkService &service)
	set Face and LinkService for Transport More...

void	setPersistency (ndn::nfd::FacePersistency newPersistency)
	changes face persistency setting More...

Public Attributes
signal::Signal< Transport, TransportState, TransportState >	afterStateChange
	signals when transport state changes More...

Static Public Attributes
static constexpr ssize_t	MIN_MTU = 64
	minimum MTU that may be set on a transport More...

Protected Member Functions
virtual void	afterChangePersistency (ndn::nfd::FacePersistency oldPersistency)
	invoked after the persistency has been changed More...

virtual bool	canChangePersistencyToImpl (ndn::nfd::FacePersistency newPersistency) const
	invoked by canChangePersistencyTo to perform the check More...

virtual void	doClose ()=0
	performs Transport specific operations to close the transport More...

void	receive (Packet &&packet)
	receive a link-layer packet More...

void	setExpirationTime (const time::steady_clock::TimePoint &expirationTime)

void	setLinkType (ndn::nfd::LinkType linkType)

void	setLocalUri (const FaceUri &uri)

void	setMtu (ssize_t mtu)

void	setRemoteUri (const FaceUri &uri)

void	setScope (ndn::nfd::FaceScope scope)

void	setSendQueueCapacity (ssize_t sendQueueCapacity)

void	setState (TransportState newState)
	set transport state More...

Protected Attributes
ByteCounter	nInBytes
	total incoming bytes More...

PacketCounter	nInPackets
	count of incoming packets More...

ByteCounter	nOutBytes
	total outgoing bytes More...

PacketCounter	nOutPackets
	count of outgoing packets More...

Detailed Description

the lower part of a Face

See also: Face

Definition at line 113 of file transport.hpp.

Member Typedef Documentation

typedef TransportCounters nfd::face::Transport::Counters

counters provided by Transport

Definition at line 146 of file transport.hpp.

typedef uint64_t nfd::face::Transport::EndpointId

identifies an endpoint on the link

Definition at line 118 of file transport.hpp.

Constructor & Destructor Documentation

nfd::face::Transport::Transport ( )

constructor

Transport constructor initializes static properties to invalid values. Subclass constructor must explicitly set every static property.

This constructor initializes TransportState to UP; subclass constructor can rely on this default value.

Definition at line 61 of file transport.cpp.

nfd::face::Transport::~Transport ( )

virtualdefault

Member Function Documentation

void nfd::face::Transport::afterChangePersistency ( ndn::nfd::FacePersistency oldPersistency )

protectedvirtual

invoked after the persistency has been changed

The base class implementation does nothing. When overridden in a subclass, the function should update internal states after persistency setting has been changed.

Reimplemented in nfd::face::TcpTransport, nfd::face::UnicastEthernetTransport, and nfd::face::UnicastUdpTransport.

Definition at line 172 of file transport.cpp.

bool nfd::face::Transport::canChangePersistencyTo ( ndn::nfd::FacePersistency newPersistency ) const

check whether the face persistency can be changed to newPersistency

This function serves as the external API, and invokes the protected function canChangePersistencyToImpl to perform further checks if newPersistency differs from the current persistency.

Returns: true if the change can be performed, false otherwise

Definition at line 132 of file transport.cpp.

bool nfd::face::Transport::canChangePersistencyToImpl ( ndn::nfd::FacePersistency newPersistency ) const

protectedvirtual

invoked by canChangePersistencyTo to perform the check

Base class implementation returns false.

Parameters

newPersistency the new persistency, guaranteed to be different from current persistency

Reimplemented in nfd::face::TcpTransport, nfd::face::UnicastEthernetTransport, and nfd::face::UnicastUdpTransport.

Definition at line 148 of file transport.cpp.

void nfd::face::Transport::close ( )

request the transport to be closed

This operation is effective only if transport is in UP or DOWN state, otherwise it has no effect. The transport changes state to CLOSING, and performs cleanup procedure. The state will be changed to CLOSED when cleanup is complete, which may happen synchronously or asynchronously.

Definition at line 87 of file transport.cpp.

virtual void nfd::face::Transport::doClose ( )

protectedpure virtual

performs Transport specific operations to close the transport

This is invoked once by close() after changing state to CLOSING. It will not be invoked by Transport class if the transport is already CLOSING or CLOSED.

When the cleanup procedure is complete, this method should change state to CLOSED. This transition can happen synchronously or asynchronously.

Implemented in nfd::face::WebSocketTransport, nfd::face::InternalForwarderTransport, nfd::face::DatagramTransport< Protocol, Addressing >, nfd::face::DatagramTransport< boost::asio::ip::udp, Unicast >, nfd::face::DatagramTransport< boost::asio::ip::udp, Multicast >, nfd::face::EthernetTransport, nfd::face::StreamTransport< Protocol >, nfd::face::TcpTransport, nfd::face::StreamTransport< boost::asio::ip::tcp >, and nfd::face::StreamTransport< boost::asio::local::stream_protocol >.

const Transport::Counters & nfd::face::Transport::getCounters ( ) const

inlinevirtual

Reimplemented in nfd::face::WebSocketTransport.

Definition at line 409 of file transport.hpp.

time::steady_clock::TimePoint nfd::face::Transport::getExpirationTime ( ) const

inline

Returns: expiration time of the transport

Return values

time::steady_clock::TimePoint::max() the transport has indefinite lifetime

Definition at line 500 of file transport.hpp.

const Face * nfd::face::Transport::getFace ( ) const

inline

Returns: Face to which this Transport is attached

Definition at line 391 of file transport.hpp.

const LinkService * nfd::face::Transport::getLinkService ( ) const

inline

Returns: LinkService to which this Transport is attached

Definition at line 397 of file transport.hpp.

LinkService * nfd::face::Transport::getLinkService ( )

inline

Returns: LinkService to which this Transport is attached

Definition at line 403 of file transport.hpp.

ndn::nfd::LinkType nfd::face::Transport::getLinkType ( ) const

inline

Returns: whether face is point-to-point or multi-access

Definition at line 457 of file transport.hpp.

FaceUri nfd::face::Transport::getLocalUri ( ) const

inline

Returns: a FaceUri representing local endpoint

Definition at line 415 of file transport.hpp.

ssize_t nfd::face::Transport::getMtu ( ) const

inline

Returns: maximum payload size

Return values

MTU_UNLIMITED transport has no limit on payload size

This size is the maximum packet size that can be sent or received through this transport.

For a datagram-based transport, this is typically the Maximum Transmission Unit (MTU), after the overhead of headers introduced by the transport has been accounted for. For a stream-based transport, this is typically unlimited (MTU_UNLIMITED).

Definition at line 469 of file transport.hpp.

ndn::nfd::FacePersistency nfd::face::Transport::getPersistency ( ) const

inline

Returns: face persistency setting

Definition at line 451 of file transport.hpp.

FaceUri nfd::face::Transport::getRemoteUri ( ) const

inline

Returns: a FaceUri representing remote endpoint

Definition at line 427 of file transport.hpp.

ndn::nfd::FaceScope nfd::face::Transport::getScope ( ) const

inline

Returns: whether face is local or non-local for scope control purpose

Definition at line 439 of file transport.hpp.

ssize_t nfd::face::Transport::getSendQueueCapacity ( ) const

inline

Returns: capacity of the send queue (in bytes)

Return values

QUEUE_UNSUPPORTED	transport does not support queue capacity retrieval
QUEUE_ERROR	transport was unable to retrieve the queue capacity

Definition at line 482 of file transport.hpp.

virtual ssize_t nfd::face::Transport::getSendQueueLength ( )

inlinevirtual

Returns: current send queue length of the transport (in octets)

Return values

QUEUE_UNSUPPORTED	transport does not support queue length retrieval
QUEUE_ERROR	transport was unable to retrieve the queue length

Reimplemented in nfd::face::MulticastUdpTransport, nfd::face::DatagramTransport< Protocol, Addressing >, nfd::face::DatagramTransport< boost::asio::ip::udp, Unicast >, nfd::face::DatagramTransport< boost::asio::ip::udp, Multicast >, nfd::face::StreamTransport< Protocol >, nfd::face::StreamTransport< boost::asio::ip::tcp >, nfd::face::StreamTransport< boost::asio::local::stream_protocol >, and nfd::face::TcpTransport.

Definition at line 287 of file transport.hpp.

TransportState nfd::face::Transport::getState ( ) const

inline

Returns: transport state

Definition at line 494 of file transport.hpp.

void nfd::face::Transport::receive ( Packet && packet )

protected

receive a link-layer packet

Warning: undefined behavior if packet size exceeds MTU limit

Definition at line 120 of file transport.cpp.

void nfd::face::Transport::send ( Packet && packet )

send a link-layer packet

Note: This operation has no effect if getState() is neither UP nor DOWN

Warning: undefined behavior if packet size exceeds MTU limit

Definition at line 100 of file transport.cpp.

void nfd::face::Transport::setExpirationTime ( const time::steady_clock::TimePoint & expirationTime )

inlineprotected

Definition at line 506 of file transport.hpp.

void nfd::face::Transport::setFaceAndLinkService	(	Face &	face,
		LinkService &	service
	)

set Face and LinkService for Transport

Precondition: setFaceAndLinkService has not been called

Definition at line 77 of file transport.cpp.

void nfd::face::Transport::setLinkType ( ndn::nfd::LinkType linkType )

inlineprotected

Definition at line 463 of file transport.hpp.

void nfd::face::Transport::setLocalUri ( const FaceUri & uri )

inlineprotected

Definition at line 421 of file transport.hpp.

void nfd::face::Transport::setMtu ( ssize_t mtu )

inlineprotected

Definition at line 475 of file transport.hpp.

void nfd::face::Transport::setPersistency ( ndn::nfd::FacePersistency newPersistency )

changes face persistency setting

Definition at line 154 of file transport.cpp.

void nfd::face::Transport::setRemoteUri ( const FaceUri & uri )

inlineprotected

Definition at line 433 of file transport.hpp.

void nfd::face::Transport::setScope ( ndn::nfd::FaceScope scope )

inlineprotected

Definition at line 445 of file transport.hpp.

void nfd::face::Transport::setSendQueueCapacity ( ssize_t sendQueueCapacity )

inlineprotected

Definition at line 488 of file transport.hpp.

void nfd::face::Transport::setState ( TransportState newState )

protected

set transport state

Only the following transitions are valid: UP->DOWN, DOWN->UP, UP/DOWN->CLOSING/FAILED, CLOSING/FAILED->CLOSED

Exceptions

std::runtime_error transition is invalid.

Definition at line 177 of file transport.cpp.

Member Data Documentation

signal::Signal<Transport, TransportState, TransportState> nfd::face::Transport::afterStateChange

signals when transport state changes

Definition at line 274 of file transport.hpp.

const ssize_t nfd::face::Transport::MIN_MTU = 64

static

minimum MTU that may be set on a transport

This is done to ensure the NDNLPv2 fragmentation feature functions properly.

Definition at line 374 of file transport.hpp.

ByteCounter nfd::face::TransportCounters::nInBytes

inherited

total incoming bytes

This counter includes headers imposed by NFD (such as NDNLP), but excludes overhead of underlying protocol (such as IP header). For a datagram-based transport, an incoming packet that cannot be parsed as TLV would not be counted.

Definition at line 83 of file transport.hpp.

PacketCounter nfd::face::TransportCounters::nInPackets

inherited

count of incoming packets

A 'packet' typically means a top-level TLV block. For a datagram-based transport, an incoming packet that cannot be parsed as TLV would not be counted.

Definition at line 67 of file transport.hpp.

ByteCounter nfd::face::TransportCounters::nOutBytes

inherited

total outgoing bytes

This counter includes headers imposed by NFD (such as NDNLP), but excludes overhead of underlying protocol (such as IP header). This counter is increased only if transport is UP.

Definition at line 91 of file transport.hpp.

PacketCounter nfd::face::TransportCounters::nOutPackets

inherited

count of outgoing packets

A 'packet' typically means a top-level TLV block. This counter is incremented only if transport is UP.

Definition at line 74 of file transport.hpp.

NFD: Named Data Networking Forwarding Daemon 0.6.5 documentation

Classes

Public Types

Public Member Functions

Public Attributes

Static Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation