#include <ddtDataTransferLib.hpp>

Inheritance diagram for ddt::DdtDataTransferLib:

Public Member Functions
virtual int	RegisterPublisher (const std::string uri, const std::string dsi, const bool compute_crc)

virtual int	UnregisterPublisher ()

virtual void	PublishData ()

virtual int	RegisterSubscriber (const std::string uri, const std::string dsi, const std::string remote_uri, const int32_t interval=10)

virtual int	UnregisterSubscriber ()

virtual DataSample *	ReadData ()

Protected Attributes
int	latency

int	deadline

int32_t	reply_time

int32_t	heartbeat_interval

std::promise< void >	exit_signal_heartbeat

std::future< void >	future_object_heartbeat

std::atomic< bool >	heartbeat_active

std::unique_ptr< datatransfer::DataBrokerRegistrationSync, std::default_delete< datatransfer::DataBrokerRegistrationSync > >	client

std::atomic< bool >	connected_to_broker

elt::mal::rr::ListenerRegistration	connection_listener

DdtLogger *	logger

DdtLogger *	my_logger = nullptr

const int32_t	REPLY_TIME_DEFAULT = 6

const int32_t	REPLY_TIME_MIN = 2

	DdtDataTransferLib (DdtLogger *ddt_logger)

	DdtDataTransferLib (log4cplus::Logger const &log4cplus_logger)

virtual	~DdtDataTransferLib ()

void	SetQoS (const int ddt_latency, const int ddt_deadline)

const std::string	VerifyPathInBrokerUri (std::string broker_uri)

int	InitMAL (const std::string broker_uri)

std::unique_ptr< datatransfer::DataBrokerRegistrationSync, std::default_delete< datatransfer::DataBrokerRegistrationSync > >	GetBrokerClient ()

void	StartHeartbeat (const int32_t interval, const std::string id)

void	StopHeartbeat ()

void	CheckHeartbeatTimeout (int32_t &new_reply_time)

const std::string	GetConfigFilePath ()

Detailed Description

Base class for DdtDataPublishers and DdtDataSubscribers.

Constructor & Destructor Documentation

◆ DdtDataTransferLib() [1/2]

DdtDataTransferLib::DdtDataTransferLib ( DdtLogger * ddt_logger )

explicit

Constructor

Parameters

ddt_logger A DDT logger object (no transfer of ownership).

◆ DdtDataTransferLib() [2/2]

DdtDataTransferLib::DdtDataTransferLib ( log4cplus::Logger const & log4cplus_logger )

explicit

Constructor

Parameters

log4cplus_logger A log4cplus logger object (no transfer of ownership).

◆ ~DdtDataTransferLib()

DdtDataTransferLib::~DdtDataTransferLib ( )

virtual

Destructor

Member Function Documentation

◆ CheckHeartbeatTimeout()

void DdtDataTransferLib::CheckHeartbeatTimeout ( int32_t & new_reply_time )

protected

Verifies that the heartbeat timeout retrieved from the broker is greater than reply time.

Parameters

new_reply_time MAL reply time for the case that the client needs to get recreated.

Make sure the heartbeat timeout is greater than the reply time! If not, recreate MAL client with new reply time.

reset reply_time (the connection manager makes sure that the heartbeat timeout has a valid value (at least 3s)

◆ GetBrokerClient()

std::unique_ptr< datatransfer::DataBrokerRegistrationSync, std::default_delete< datatransfer::DataBrokerRegistrationSync > > DdtDataTransferLib::GetBrokerClient ( )

Retrieve the smart pointer for the client created by the MAL Factory

Returns: Unique pointer for DDT Broker Client

◆ GetConfigFilePath()

const std::string DdtDataTransferLib::GetConfigFilePath ( )

protected

This function reads the environment variable DDT_TRANSFERCONFIG_PATH and returns path and name of the configuration file.

Returns: A string containing the path to the configuration file.

check if DDT_TRANSFERCONFIG_PATH is set return empty string if not set

◆ InitMAL()

int DdtDataTransferLib::InitMAL ( const std::string broker_uri )

Initializes the MAL.

Parameters

broker_uri The URI of the broker.

Returns: 1 if initialization was successfull, -1 otherwise.

determine MAL mapping from uri and load it obtain reference to CiiFactory

Synchronous client example w/ ReplyTime QoS set. DataBrokerRegistrationSync interface is requested.

◆ PublishData()

virtual void ddt::DdtDataTransferLib::PublishData ( )

inlinevirtual

Function for triggering the local broker to publish data over the network.

Reimplemented in ddt::DdtDataPublisher.

◆ ReadData()

virtual DataSample * ddt::DdtDataTransferLib::ReadData ( )

inlinevirtual

Function for receiving data.

Returns: The data sample.

Reimplemented in ddt::DdtDataSubscriber.

◆ RegisterPublisher()

virtual int ddt::DdtDataTransferLib::RegisterPublisher	(	const std::string	uri,
		const std::string	dsi,
		const bool	compute_crc )

inlinevirtual

Function for registering a publisher at the local broker using a MAL client.

Parameters

uri	The MAL Uniform Resource Identifier.
dsi	The data stream identifier.
compute_crc	Used to switch on / off the CRC computation.

Returns: Success of registration.

Reimplemented in ddt::DdtDataPublisher.

◆ RegisterSubscriber()

virtual int ddt::DdtDataTransferLib::RegisterSubscriber	(	const std::string	uri,
		const std::string	dsi,
		const std::string	remote_uri,
		const int32_t	interval = 10 )

inlinevirtual

Function for registering a subscriber at the local broker using a MAL client.

Parameters

uri	The MAL Uniform Resource Identifier.
dsi	The data stream identifier.
remote_uri	The URI of the remote broker.
interval	The reading interval.

Returns: Success of registration.

Reimplemented in ddt::DdtDataSubscriber.

◆ SetQoS()

void DdtDataTransferLib::SetQoS	(	const int	ddt_latency,
		const int	ddt_deadline )

Sets quality of service parameters.

Parameters

ddt_latency	A MAL QoS parameter. Shall be the maximum time a sample may remain in-transit between the publisher and subscriber in [ms].
ddt_deadline	A MAL QoS parameter. Shall be the maximum age of a sample in [s].

◆ StartHeartbeat()

void DdtDataTransferLib::StartHeartbeat	(	const int32_t	interval,
		const std::string	id )

protected

Starts the heartbeat thread.

Parameters

interval	The heartbeat interval in [s].
id	The data stream identifier (in case of a publisher) or the UUID (in case of a subscriber).

◆ StopHeartbeat()

void DdtDataTransferLib::StopHeartbeat ( )

protected

Stops the heartbeat thread.

◆ UnregisterPublisher()

virtual int ddt::DdtDataTransferLib::UnregisterPublisher ( )

inlinevirtual

Function for unregistering a publisher from the local broker.

Returns: Success of unregistration.

Reimplemented in ddt::DdtDataPublisher.

◆ UnregisterSubscriber()

virtual int ddt::DdtDataTransferLib::UnregisterSubscriber ( )

inlinevirtual

Function for unregistering a subscriber from the local broker.

Returns: Success of unregistration.

Reimplemented in ddt::DdtDataSubscriber.

◆ VerifyPathInBrokerUri()

const std::string DdtDataTransferLib::VerifyPathInBrokerUri ( std::string broker_uri )

This function verifies if the broker uri contains the path element. If not specified by the user the path element is added.

Parameters

broker_uri The URI of the broker.

Returns: The URI of the broker including a path element that is required by MAL.

Member Data Documentation

◆ client

std::unique_ptr< datatransfer::DataBrokerRegistrationSync, std::default_delete<datatransfer::DataBrokerRegistrationSync> > ddt::DdtDataTransferLib::client

protected

MAL client used to connect to data brokers.

◆ connected_to_broker

std::atomic<bool> ddt::DdtDataTransferLib::connected_to_broker

protected

Stores connection state to broker.

◆ connection_listener

elt::mal::rr::ListenerRegistration ddt::DdtDataTransferLib::connection_listener

protected

Observes the connection to the broker.

◆ deadline

int ddt::DdtDataTransferLib::deadline

protected

Maximum age of a sample [s].

◆ exit_signal_heartbeat

std::promise<void> ddt::DdtDataTransferLib::exit_signal_heartbeat

protected

A std::promise object used to stop the heartbeat thread.

◆ future_object_heartbeat

std::future<void> ddt::DdtDataTransferLib::future_object_heartbeat

protected

A std::future object associated with exit_signal_heartbeat.

◆ heartbeat_active

std::atomic<bool> ddt::DdtDataTransferLib::heartbeat_active

protected

When the HearbeatThread is stopped it waits until heartbeat_active is set to false.

◆ heartbeat_interval

int32_t ddt::DdtDataTransferLib::heartbeat_interval

protected

Interval for the heartbeat in [s] retrieved from the data broker.

◆ latency

int ddt::DdtDataTransferLib::latency

protected

Duration between send and receive cannot be greater than 'latency' [ms].

◆ logger

DdtLogger* ddt::DdtDataTransferLib::logger

protected

A DDT logger object.

◆ my_logger

DdtLogger* ddt::DdtDataTransferLib::my_logger = nullptr

protected

A DDT logger object.

◆ reply_time

int32_t ddt::DdtDataTransferLib::reply_time

protected

Configurable reply time for MAL clients in [s].

◆ REPLY_TIME_DEFAULT

const int32_t ddt::DdtDataTransferLib::REPLY_TIME_DEFAULT = 6

protected

Default value for the reply time.

◆ REPLY_TIME_MIN

const int32_t ddt::DdtDataTransferLib::REPLY_TIME_MIN = 2

protected

Minimum value for the reply time.

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

datatransfer/datatransferlib/src/include/ddt/ddtDataTransferLib.hpp
datatransfer/datatransferlib/src/ddtDataTransferLib.cpp

Public Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ DdtDataTransferLib() [1/2]

◆ DdtDataTransferLib() [2/2]

◆ ~DdtDataTransferLib()

Member Function Documentation

◆ CheckHeartbeatTimeout()

◆ GetBrokerClient()

◆ GetConfigFilePath()

◆ InitMAL()

◆ PublishData()

◆ ReadData()

◆ RegisterPublisher()

◆ RegisterSubscriber()

◆ SetQoS()

◆ StartHeartbeat()

◆ StopHeartbeat()

◆ UnregisterPublisher()

◆ UnregisterSubscriber()

◆ VerifyPathInBrokerUri()

Member Data Documentation

◆ client

◆ connected_to_broker

◆ connection_listener

◆ deadline

◆ exit_signal_heartbeat

◆ future_object_heartbeat

◆ heartbeat_active

◆ heartbeat_interval

◆ latency

◆ logger

◆ my_logger

◆ reply_time

◆ REPLY_TIME_DEFAULT

◆ REPLY_TIME_MIN