ddt::DdtDataSubscriber Class Reference

#include <ddtDataSubscriber.hpp>

Inheritance diagram for ddt::DdtDataSubscriber:

Public Member Functions
	DdtDataSubscriber (DdtLogger *logger)
virtual	~DdtDataSubscriber ()
int	RegisterSubscriber (std::string broker_uri, std::string data_stream_identifier, std::string remote_broker_uri, int32_t reading_interval=10) override
int	UnregisterSubscriber () override
DataSample *	ReadData () override
void	StartNotificationSubscription ()
void	StopNotificationSubscription ()
DdtStatistics	get_statistics ()
boost::signals2::connection	connect (const signal_t::slot_type &event_listener)
Public Member Functions inherited from ddt::DdtDataTransferLib
	DdtDataTransferLib (DdtLogger *ddt_logger)
virtual	~DdtDataTransferLib ()
void	SetQoS (const int ddt_latency, const int ddt_deadline)
virtual int	RegisterPublisher (std::string broker_uri, std::string data_stream_identifier, bool compute_checksum)
virtual int	UnregisterPublisher ()
virtual void	PublishData ()

Protected Member Functions
void	LoadDefaults ()
void	ReadIni ()
Protected Member Functions inherited from ddt::DdtDataTransferLib
void	StartHeartbeat (const int32_t interval, const std::string id)
void	StopHeartbeat ()
void	CheckHeartbeatTimeout (int32_t &new_reply_time)
const std::string	VerifyPathInBrokerUri (std::string broker_uri)
const std::string	GetConfigFilePath ()

Protected Attributes
int32_t	max_age_data_sample
const int32_t	MAX_AGE_DATA_SAMPLE_DEFAULT = 10000
Protected Attributes inherited from ddt::DdtDataTransferLib
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
const int32_t	REPLY_TIME_DEFAULT = 6
const int32_t	REPLY_TIME_MIN = 2

Detailed Description

This class provides the functionality for subscriber applications to register / unregister at a local broker and to receive data for a specified data stream.

Constructor & Destructor Documentation

DdtDataSubscriber()

DdtDataSubscriber::DdtDataSubscriber

(

DdtLogger *

logger

)

Constructor

~DdtDataSubscriber()

DdtDataSubscriber::~DdtDataSubscriber ( )

virtual

Destructor

Member Function Documentation

connect()

boost::signals2::connection DdtDataSubscriber::connect

(

const signal_t::slot_type &

event_listener

)

Connects the event_listener with the DataAvailableSignal from the memory accessor.

get_statistics()

DdtStatistics DdtDataSubscriber::get_statistics

(

)

Returns the statistics.

LoadDefaults()

void DdtDataSubscriber::LoadDefaults ( )

protected

Loads default values for configuration parameters.

ReadData()

DataSample * DdtDataSubscriber::ReadData ( )

overridevirtual

Function for receiving data.

Reimplemented from ddt::DdtDataTransferLib.

ReadIni()

void DdtDataSubscriber::ReadIni ( )

protected

Reads the datatransferlib configuration file.

An exception is thrown if the config file does not exist. In that case the default values are used instead.

RegisterSubscriber()

int DdtDataSubscriber::RegisterSubscriber ( std::string  broker_uri, std::string  data_stream_identifier, std::string  remote_broker_uri, int32_t  reading_interval = 10  )

overridevirtual

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

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

Reimplemented from ddt::DdtDataTransferLib.

StartNotificationSubscription()

void DdtDataSubscriber::StartNotificationSubscription

(

)

Starts MAL subscription for notifications as a separate thread.

StopNotificationSubscription()

void DdtDataSubscriber::StopNotificationSubscription

(

)

Stops MAL subscription.

UnregisterSubscriber()

int DdtDataSubscriber::UnregisterSubscriber ( )

overridevirtual

Function for unregistering a subscriber from the local broker.

Reimplemented from ddt::DdtDataTransferLib.

Member Data Documentation

max_age_data_sample

int32_t ddt::DdtDataSubscriber::max_age_data_sample

protected

configurable time window for dropping data samples in [ms]

MAX_AGE_DATA_SAMPLE_DEFAULT

const int32_t ddt::DdtDataSubscriber::MAX_AGE_DATA_SAMPLE_DEFAULT = 10000

protected

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

• datatransfer/datatransferlib/src/include/ddt/ddtDataSubscriber.hpp
• datatransfer/datatransferlib/src/ddtDataSubscriber.cpp