Definition at line 35 of file RNTupleDS.hxx.

Public Member Functions
	RNTupleDS (std::unique_ptr< ROOT::Experimental::RNTupleReader > ntuple)

	~RNTupleDS ()=default

const std::vector< std::string > &	GetColumnNames () const final
	Returns a reference to the collection of the dataset's column names. More...

std::vector< std::pair< ULong64_t, ULong64_t > >	GetEntryRanges () final
	Return ranges of entries to distribute to tasks. More...

std::string	GetTypeName (std::string_view colName) const final
	Type of a column as a string, e.g. More...

bool	HasColumn (std::string_view colName) const final
	Checks if the dataset has a certain column. More...

void	Initialise () final
	Convenience method called before starting an event-loop. More...

bool	SetEntry (unsigned int slot, ULong64_t entry) final
	Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot. More...

void	SetNSlots (unsigned int nSlots) final
	Inform RDataSource of the number of processing slots (i.e. More...

Public Member Functions inherited from ROOT::RDF::RDataSource
virtual	~RDataSource ()=default

virtual void	Finalise ()
	Convenience method called after concluding an event-loop. More...

virtual void	FinaliseSlot (unsigned int)
	Convenience method called at the end of the data processing associated to a slot. More...

virtual const std::vector< std::string > &	GetColumnNames () const =0
	Returns a reference to the collection of the dataset's column names. More...

template<typename T >
std::vector< T ** >	GetColumnReaders (std::string_view columnName)
	Called at most once per column by RDF. More...

virtual std::vector< std::pair< ULong64_t, ULong64_t > >	GetEntryRanges ()=0
	Return ranges of entries to distribute to tasks. More...

virtual std::string	GetLabel ()
	Return a string representation of the datasource type. More...

virtual std::string	GetTypeName (std::string_view) const =0
	Type of a column as a string, e.g. More...

virtual bool	HasColumn (std::string_view) const =0
	Checks if the dataset has a certain column. More...

virtual void	Initialise ()
	Convenience method called before starting an event-loop. More...

virtual void	InitSlot (unsigned int, ULong64_t)
	Convenience method called at the start of the data processing associated to a slot. More...

virtual bool	SetEntry (unsigned int slot, ULong64_t entry)=0
	Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot. More...

virtual void	SetNSlots (unsigned int nSlots)=0
	Inform RDataSource of the number of processing slots (i.e. More...

Protected Member Functions
Record_t	GetColumnReadersImpl (std::string_view name, const std::type_info &) final
	type-erased vector of pointers to pointers to column values - one per slot More...

Protected Member Functions inherited from ROOT::RDF::RDataSource
virtual std::string	AsString ()

virtual Record_t	GetColumnReadersImpl (std::string_view name, const std::type_info &)=0
	type-erased vector of pointers to pointers to column values - one per slot More...

Private Attributes
std::vector< std::string >	fColumnNames

std::vector< std::string >	fColumnTypes

std::vector< std::unique_ptr< ROOT::Experimental::REntry > >	fEntries

bool	fHasSeenAllRanges = false

unsigned	fNSlots = 0

std::vector< std::unique_ptr< ROOT::Experimental::RNTupleReader > >	fReaders
	Clones of the first reader, one for each slot. More...

std::vector< std::vector< void * > >	fValuePtrs
	The raw pointers wrapped by the RValue items of fEntries. More...

Additional Inherited Members
Protected Types inherited from ROOT::RDF::RDataSource
using	Record_t = std::vector< void * >

#include <ROOT/RNTupleDS.hxx>

Inheritance diagram for ROOT::Experimental::RNTupleDS:

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Constructor & Destructor Documentation

◆ RNTupleDS()

ROOT::Experimental::RNTupleDS::RNTupleDS ( std::unique_ptr< ROOT::Experimental::RNTupleReader > ntuple )

explicit

Definition at line 30 of file RNTupleDS.cxx.

◆ ~RNTupleDS()

ROOT::Experimental::RNTupleDS::~RNTupleDS ( )

default

Member Function Documentation

◆ GetColumnNames()

const std::vector< std::string > & ROOT::Experimental::RNTupleDS::GetColumnNames ( ) const

finalvirtual

Returns a reference to the collection of the dataset's column names.

Implements ROOT::RDF::RDataSource.

Definition at line 42 of file RNTupleDS.cxx.

◆ GetColumnReadersImpl()

RDF::RDataSource::Record_t ROOT::Experimental::RNTupleDS::GetColumnReadersImpl	(	std::string_view	name,
		const std::type_info &
	)

finalprotectedvirtual

type-erased vector of pointers to pointers to column values - one per slot

Implements ROOT::RDF::RDataSource.

Definition at line 48 of file RNTupleDS.cxx.

◆ GetEntryRanges()

std::vector< std::pair< ULong64_t, ULong64_t > > ROOT::Experimental::RNTupleDS::GetEntryRanges ( )

finalvirtual

Return ranges of entries to distribute to tasks.

They are required to be contiguous intervals with no entries skipped. Supposing a dataset with nEntries, the intervals must start at 0 and end at nEntries, e.g. [0-5],[5-10] for 10 entries. This function will be invoked repeatedly by RDataFrame as it needs additional entries to process. The same entry range should not be returned more than once. Returning an empty collection of ranges signals to RDataFrame that the processing can stop.

Implements ROOT::RDF::RDataSource.

Definition at line 68 of file RNTupleDS.cxx.

◆ GetTypeName()

std::string ROOT::Experimental::RNTupleDS::GetTypeName ( std::string_view ) const

finalvirtual

Type of a column as a string, e.g.

GetTypeName("x") == "double". Required for jitting e.g. df.Filter("x>0").

Parameters

[in] columnName The name of the column

Implements ROOT::RDF::RDataSource.

Definition at line 91 of file RNTupleDS.cxx.

◆ HasColumn()

bool ROOT::Experimental::RNTupleDS::HasColumn ( std::string_view ) const

finalvirtual

Checks if the dataset has a certain column.

Parameters

[in] columnName The name of the column

Implements ROOT::RDF::RDataSource.

Definition at line 99 of file RNTupleDS.cxx.

◆ Initialise()

void ROOT::Experimental::RNTupleDS::Initialise ( )

finalvirtual

Convenience method called before starting an event-loop.

This method might be called multiple times over the lifetime of a RDataSource, since users can run multiple event-loops with the same RDataFrame. Ideally, Initialise should set the state of the RDataSource so that multiple identical event-loops will produce identical results.

Reimplemented from ROOT::RDF::RDataSource.

Definition at line 106 of file RNTupleDS.cxx.

◆ SetEntry()

bool ROOT::Experimental::RNTupleDS::SetEntry	(	unsigned int	slot,
		ULong64_t	entry
	)

finalvirtual

Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot.

Parameters

[in]	slot	The data processing slot that needs to be considered
[in]	entry	The entry which needs to be pointed to by the reader pointers Slots are adopted to accommodate parallel data processing. Different workers will loop over different ranges and will be labelled by different "slot" values. Returns true if the entry has to be processed, false otherwise.

Implements ROOT::RDF::RDataSource.

Definition at line 62 of file RNTupleDS.cxx.

◆ SetNSlots()

void ROOT::Experimental::RNTupleDS::SetNSlots ( unsigned int nSlots )

finalvirtual

Inform RDataSource of the number of processing slots (i.e.

worker threads) used by the associated RDataFrame. Slots numbers are used to simplify parallel execution: RDataFrame guarantees that different threads will always pass different slot values when calling methods concurrently.

Implements ROOT::RDF::RDataSource.

Definition at line 112 of file RNTupleDS.cxx.

Member Data Documentation

◆ fColumnNames

std::vector<std::string> ROOT::Experimental::RNTupleDS::fColumnNames

private

Definition at line 43 of file RNTupleDS.hxx.

◆ fColumnTypes

std::vector<std::string> ROOT::Experimental::RNTupleDS::fColumnTypes

private

Definition at line 44 of file RNTupleDS.hxx.

◆ fEntries

std::vector<std::unique_ptr<ROOT::Experimental::REntry> > ROOT::Experimental::RNTupleDS::fEntries

private

Definition at line 38 of file RNTupleDS.hxx.

◆ fHasSeenAllRanges

bool ROOT::Experimental::RNTupleDS::fHasSeenAllRanges = false

private

Definition at line 42 of file RNTupleDS.hxx.

◆ fNSlots

unsigned ROOT::Experimental::RNTupleDS::fNSlots = 0

private

Definition at line 41 of file RNTupleDS.hxx.

◆ fReaders

std::vector<std::unique_ptr<ROOT::Experimental::RNTupleReader> > ROOT::Experimental::RNTupleDS::fReaders

private

Clones of the first reader, one for each slot.

Definition at line 37 of file RNTupleDS.hxx.

◆ fValuePtrs

std::vector<std::vector<void*> > ROOT::Experimental::RNTupleDS::fValuePtrs

private

The raw pointers wrapped by the RValue items of fEntries.

Definition at line 40 of file RNTupleDS.hxx.

Libraries for ROOT::Experimental::RNTupleDS:

[legend]

Public Member Functions

Protected Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RNTupleDS()

◆ ~RNTupleDS()

Member Function Documentation

◆ GetColumnNames()

◆ GetColumnReadersImpl()

◆ GetEntryRanges()

◆ GetTypeName()

◆ HasColumn()

◆ Initialise()

◆ SetEntry()

◆ SetNSlots()

Member Data Documentation

◆ fColumnNames

◆ fColumnTypes

◆ fEntries

◆ fHasSeenAllRanges

◆ fNSlots

◆ fReaders

◆ fValuePtrs