Abstract base class for DDAS data sources. More...

#include <DataSource.h>

Inheritance diagram for DataSource:

Public Member Functions
	DataSource (ufmt::RingItemFactoryBase *pFactory)
	Constructor. More...

virtual	~DataSource ()=default
	Destructor. More...

virtual ufmt::CRingItem *	getItem ()=0
	Pure-virtual method to access a ring item from the data source. Must be implemented in derived classes. More...

void	setFactory (ufmt::RingItemFactoryBase *pFactory)
	Set a new factory. More...

Protected Attributes
ufmt::RingItemFactoryBase *	m_pFactory
	Ptr to our ring item factory. More...

Detailed Description

Abstract base class for DDAS data sources.

Pure abstract data source which uses a factory's ring item getters to provide ring items from a data source. Since the factory provides this, we'll need concrete classes:

FdDataSource: give data from a file descriptor.
StreamDataSource: give data from a stream.
Note
Neither of these data sources supports reading directly from a ring buffer, as the format library is unaware of those NSCLDAQ classes. To read data from a ringbuffer you can create a file descriptor data source and read data from stdin i.e. ringselector | ddasdumper -.

Constructor & Destructor Documentation

◆ DataSource()

DataSource::DataSource ( ufmt::RingItemFactoryBase * pFactory )

Constructor.

Parameters

pFactory Pointer to concrete ring item factory.

Just saves the factory pointer - note that the format factory selector maintains ownership of the factory.

◆ ~DataSource()

virtual DataSource::~DataSource ( )

virtualdefault

Destructor.

Member Function Documentation

◆ getItem()

virtual ufmt::CRingItem * DataSource::getItem ( )

pure virtual

Pure-virtual method to access a ring item from the data source. Must be implemented in derived classes.

Returns: Pointer to the next ring item from the source.

Implemented in FdDataSource, and StreamDataSource.

◆ setFactory()

void DataSource::setFactory ( ufmt::RingItemFactoryBase * pFactory )

Set a new factory.

Pretty simple: Set a new factory e.g., if the format changes. Note that since we do not own the factory we do not delete the old one.

Member Data Documentation

◆ m_pFactory

ufmt::RingItemFactoryBase* DataSource::m_pFactory

protected

Ptr to our ring item factory.

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

Public Member Functions

Protected Attributes