A context for filling entries (data) into clusters of an RNTuple.

An output cluster can be filled with entries. The caller has to make sure that the data that gets filled into a cluster is not modified for the time of the Fill() call. The fill call serializes the C++ object into the column format and writes data into the corresponding column page buffers. Writing of the buffers to storage is deferred and can be triggered by FlushCluster() or by destructing the context. On I/O errors, an exception is thrown.

Instances of this class are not meant to be used in isolation and can be created from an RNTupleParallelWriter. For sequential writing, please refer to RNTupleWriter.

Definition at line 52 of file RNTupleFillContext.hxx.

Public Member Functions
	~RNTupleFillContext ()

void	CommitStagedClusters ()
	Logically append staged clusters to the RNTuple.

std::unique_ptr< ROOT::REntry >	CreateEntry () const

std::unique_ptr< Detail::RRawPtrWriteEntry >	CreateRawPtrWriteEntry () const

void	EnableMetrics ()

void	EnableStagedClusterCommitting (bool val=true)

std::size_t	Fill (Detail::RRawPtrWriteEntry &entry)
	Fill an RRawPtrWriteEntry into this context.

std::size_t	Fill (ROOT::REntry &entry)
	Fill an entry into this context.

void	FillNoFlush (Detail::RRawPtrWriteEntry &entry, ROOT::RNTupleFillStatus &status)
	Fill an RRawPtrWriteEntry into this context, but don't commit the cluster.

void	FillNoFlush (ROOT::REntry &entry, ROOT::RNTupleFillStatus &status)
	Fill an entry into this context, but don't commit the cluster.

void	FlushCluster ()
	Flush so far filled entries to storage.

void	FlushColumns ()
	Flush column data, preparing for CommitCluster or to reduce memory usage.

ROOT::NTupleSize_t	GetLastFlushed () const
	Return the entry number that was last flushed in a cluster.

const Detail::RNTupleMetrics &	GetMetrics () const

const ROOT::RNTupleModel &	GetModel () const

ROOT::NTupleSize_t	GetNEntries () const
	Return the number of entries filled so far.

bool	IsStagedClusterCommittingEnabled () const

Private Member Functions
	RNTupleFillContext (const RNTupleFillContext &)=delete

	RNTupleFillContext (std::unique_ptr< ROOT::RNTupleModel > model, std::unique_ptr< ROOT::Internal::RPageSink > sink)

template<typename Entry >
std::size_t	FillImpl (Entry &entry)

template<typename Entry >
void	FillNoFlushImpl (Entry &entry, ROOT::RNTupleFillStatus &status)

RNTupleFillContext &	operator= (const RNTupleFillContext &)=delete

Private Attributes
ROOT::NTupleSize_t	fLastFlushed = 0

std::size_t	fMaxUnzippedClusterSize
	Limit for committing cluster no matter the other tunables.

Detail::RNTupleMetrics	fMetrics

std::unique_ptr< ROOT::RNTupleModel >	fModel
	Needs to be destructed before fSink.

std::uint64_t	fNBytesFilled = 0
	The total number of bytes filled into all the so far committed clusters, i.e.

std::uint64_t	fNBytesFlushed = 0
	The total number of bytes written to storage (i.e., after compression)

ROOT::NTupleSize_t	fNEntries = 0

std::unique_ptr< ROOT::Internal::RPageSink >	fSink

bool	fStagedClusterCommitting = false
	Whether to enable staged cluster committing, where only an explicit call to CommitStagedClusters() will logically append the clusters to the RNTuple.

std::vector< ROOT::Internal::RPageSink::RStagedCluster >	fStagedClusters
	Vector of currently staged clusters.

std::size_t	fUnzippedClusterSize = 0
	Keeps track of the number of bytes written into the current cluster.

std::size_t	fUnzippedClusterSizeEst
	Estimator of uncompressed cluster size, taking into account the estimated compression ratio.

Friends
class	RNTupleParallelWriter

class	ROOT::RNTupleWriter

#include <ROOT/RNTupleFillContext.hxx>

Constructor & Destructor Documentation

◆ RNTupleFillContext() [1/2]

ROOT::Experimental::RNTupleFillContext::RNTupleFillContext	(	std::unique_ptr< ROOT::RNTupleModel >	model,
		std::unique_ptr< ROOT::Internal::RPageSink >	sink )

private

Definition at line 29 of file RNTupleFillContext.cxx.

◆ RNTupleFillContext() [2/2]

ROOT::Experimental::RNTupleFillContext::RNTupleFillContext ( const RNTupleFillContext & )

privatedelete

◆ ~RNTupleFillContext()

ROOT::Experimental::RNTupleFillContext::~RNTupleFillContext ( )

Definition at line 44 of file RNTupleFillContext.cxx.

Member Function Documentation

◆ CommitStagedClusters()

void ROOT::Experimental::RNTupleFillContext::CommitStagedClusters ( )

Logically append staged clusters to the RNTuple.

Definition at line 93 of file RNTupleFillContext.cxx.

◆ CreateEntry()

std::unique_ptr< ROOT::REntry > ROOT::Experimental::RNTupleFillContext::CreateEntry ( ) const

inline

Definition at line 150 of file RNTupleFillContext.hxx.

◆ CreateRawPtrWriteEntry()

std::unique_ptr< Detail::RRawPtrWriteEntry > ROOT::Experimental::RNTupleFillContext::CreateRawPtrWriteEntry ( ) const

inline

Definition at line 151 of file RNTupleFillContext.hxx.

◆ EnableMetrics()

void ROOT::Experimental::RNTupleFillContext::EnableMetrics ( )

inline

Definition at line 170 of file RNTupleFillContext.hxx.

◆ EnableStagedClusterCommitting()

void ROOT::Experimental::RNTupleFillContext::EnableStagedClusterCommitting ( bool val = true )

inline

Definition at line 161 of file RNTupleFillContext.hxx.

◆ Fill() [1/2]

std::size_t ROOT::Experimental::RNTupleFillContext::Fill ( Detail::RRawPtrWriteEntry & entry )

inline

Fill an RRawPtrWriteEntry into this context.

This method will check the entry's model ID to ensure it comes from the context's own model or throw an exception otherwise.

Returns: The number of uncompressed bytes written.

Definition at line 139 of file RNTupleFillContext.hxx.

◆ Fill() [2/2]

std::size_t ROOT::Experimental::RNTupleFillContext::Fill ( ROOT::REntry & entry )

inline

Fill an entry into this context.

This method will check the entry's model ID to ensure it comes from the context's own model or throw an exception otherwise.

Returns: The number of uncompressed bytes written.

Definition at line 125 of file RNTupleFillContext.hxx.

◆ FillImpl()

template<typename Entry >

std::size_t ROOT::Experimental::RNTupleFillContext::FillImpl ( Entry & entry )

inlineprivate

Definition at line 100 of file RNTupleFillContext.hxx.

◆ FillNoFlush() [1/2]

void ROOT::Experimental::RNTupleFillContext::FillNoFlush	(	Detail::RRawPtrWriteEntry &	entry,
		ROOT::RNTupleFillStatus &	status )

inline

Fill an RRawPtrWriteEntry into this context, but don't commit the cluster.

The calling code must pass an RNTupleFillStatus and check RNTupleFillStatus::ShouldFlushCluster.

This method will check the entry's model ID to ensure it comes from the context's own model or throw an exception otherwise.

Definition at line 132 of file RNTupleFillContext.hxx.

◆ FillNoFlush() [2/2]

void ROOT::Experimental::RNTupleFillContext::FillNoFlush	(	ROOT::REntry &	entry,
		ROOT::RNTupleFillStatus &	status )

inline

Fill an entry into this context, but don't commit the cluster.

The calling code must pass an RNTupleFillStatus and check RNTupleFillStatus::ShouldFlushCluster.

This method will check the entry's model ID to ensure it comes from the context's own model or throw an exception otherwise.

Definition at line 121 of file RNTupleFillContext.hxx.

◆ FillNoFlushImpl()

template<typename Entry >

void ROOT::Experimental::RNTupleFillContext::FillNoFlushImpl	(	Entry &	entry,
		ROOT::RNTupleFillStatus &	status )

inlineprivate

Definition at line 84 of file RNTupleFillContext.hxx.

◆ FlushCluster()

void ROOT::Experimental::RNTupleFillContext::FlushCluster ( )

Flush so far filled entries to storage.

Definition at line 65 of file RNTupleFillContext.cxx.

◆ FlushColumns()

void ROOT::Experimental::RNTupleFillContext::FlushColumns ( )

Flush column data, preparing for CommitCluster or to reduce memory usage.

This will trigger compression of pages, but not actually write to storage.

Definition at line 58 of file RNTupleFillContext.cxx.

◆ GetLastFlushed()

ROOT::NTupleSize_t ROOT::Experimental::RNTupleFillContext::GetLastFlushed ( ) const

inline

Return the entry number that was last flushed in a cluster.

Definition at line 157 of file RNTupleFillContext.hxx.

◆ GetMetrics()

const Detail::RNTupleMetrics & ROOT::Experimental::RNTupleFillContext::GetMetrics ( ) const

inline

Definition at line 171 of file RNTupleFillContext.hxx.

◆ GetModel()

const ROOT::RNTupleModel & ROOT::Experimental::RNTupleFillContext::GetModel ( ) const

inline

Definition at line 149 of file RNTupleFillContext.hxx.

◆ GetNEntries()

ROOT::NTupleSize_t ROOT::Experimental::RNTupleFillContext::GetNEntries ( ) const

inline

Return the number of entries filled so far.

Definition at line 159 of file RNTupleFillContext.hxx.

◆ IsStagedClusterCommittingEnabled()

bool ROOT::Experimental::RNTupleFillContext::IsStagedClusterCommittingEnabled ( ) const

inline

Definition at line 168 of file RNTupleFillContext.hxx.

◆ operator=()

RNTupleFillContext & ROOT::Experimental::RNTupleFillContext::operator= ( const RNTupleFillContext & )

privatedelete

Friends And Related Symbol Documentation

◆ RNTupleParallelWriter

friend class RNTupleParallelWriter

friend

Definition at line 54 of file RNTupleFillContext.hxx.

◆ ROOT::RNTupleWriter

friend class ROOT::RNTupleWriter

friend

Definition at line 53 of file RNTupleFillContext.hxx.

Member Data Documentation

◆ fLastFlushed

ROOT::NTupleSize_t ROOT::Experimental::RNTupleFillContext::fLastFlushed = 0

private

Definition at line 63 of file RNTupleFillContext.hxx.

◆ fMaxUnzippedClusterSize

std::size_t ROOT::Experimental::RNTupleFillContext::fMaxUnzippedClusterSize

private

Limit for committing cluster no matter the other tunables.

Definition at line 73 of file RNTupleFillContext.hxx.

◆ fMetrics

Detail::RNTupleMetrics ROOT::Experimental::RNTupleFillContext::fMetrics

private

Definition at line 61 of file RNTupleFillContext.hxx.

◆ fModel

std::unique_ptr<ROOT::RNTupleModel> ROOT::Experimental::RNTupleFillContext::fModel

private

Needs to be destructed before fSink.

Definition at line 59 of file RNTupleFillContext.hxx.

◆ fNBytesFilled

std::uint64_t ROOT::Experimental::RNTupleFillContext::fNBytesFilled = 0

private

The total number of bytes filled into all the so far committed clusters, i.e.

the uncompressed size of the written clusters

Definition at line 71 of file RNTupleFillContext.hxx.

◆ fNBytesFlushed

std::uint64_t ROOT::Experimental::RNTupleFillContext::fNBytesFlushed = 0

private

The total number of bytes written to storage (i.e., after compression)

Definition at line 68 of file RNTupleFillContext.hxx.

◆ fNEntries

ROOT::NTupleSize_t ROOT::Experimental::RNTupleFillContext::fNEntries = 0

private

Definition at line 64 of file RNTupleFillContext.hxx.

◆ fSink

std::unique_ptr<ROOT::Internal::RPageSink> ROOT::Experimental::RNTupleFillContext::fSink

private

Definition at line 57 of file RNTupleFillContext.hxx.

◆ fStagedClusterCommitting

bool ROOT::Experimental::RNTupleFillContext::fStagedClusterCommitting = false

private

Whether to enable staged cluster committing, where only an explicit call to CommitStagedClusters() will logically append the clusters to the RNTuple.

Definition at line 79 of file RNTupleFillContext.hxx.

◆ fStagedClusters

std::vector<ROOT::Internal::RPageSink::RStagedCluster> ROOT::Experimental::RNTupleFillContext::fStagedClusters

private

Vector of currently staged clusters.

Definition at line 81 of file RNTupleFillContext.hxx.

◆ fUnzippedClusterSize

std::size_t ROOT::Experimental::RNTupleFillContext::fUnzippedClusterSize = 0

private

Keeps track of the number of bytes written into the current cluster.

Definition at line 66 of file RNTupleFillContext.hxx.

◆ fUnzippedClusterSizeEst

std::size_t ROOT::Experimental::RNTupleFillContext::fUnzippedClusterSizeEst

private

Estimator of uncompressed cluster size, taking into account the estimated compression ratio.

Definition at line 75 of file RNTupleFillContext.hxx.

Libraries for ROOT::Experimental::RNTupleFillContext:

[legend]

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

tree/ntuple/inc/ROOT/RNTupleFillContext.hxx
tree/ntuple/src/RNTupleFillContext.cxx

Public Member Functions

Private Member Functions

Private Attributes

Friends

Constructor & Destructor Documentation

◆ RNTupleFillContext() [1/2]

◆ RNTupleFillContext() [2/2]

◆ ~RNTupleFillContext()

Member Function Documentation

◆ CommitStagedClusters()

◆ CreateEntry()

◆ CreateRawPtrWriteEntry()

◆ EnableMetrics()

◆ EnableStagedClusterCommitting()

◆ Fill() [1/2]

◆ Fill() [2/2]

◆ FillImpl()

◆ FillNoFlush() [1/2]

◆ FillNoFlush() [2/2]

◆ FillNoFlushImpl()

◆ FlushCluster()

◆ FlushColumns()

◆ GetLastFlushed()

◆ GetMetrics()

◆ GetModel()

◆ GetNEntries()

◆ IsStagedClusterCommittingEnabled()

◆ operator=()

Friends And Related Symbol Documentation

◆ RNTupleParallelWriter

◆ ROOT::RNTupleWriter

Member Data Documentation

◆ fLastFlushed

◆ fMaxUnzippedClusterSize

◆ fMetrics

◆ fModel

◆ fNBytesFilled

◆ fNBytesFlushed

◆ fNEntries

◆ fSink

◆ fStagedClusterCommitting

◆ fStagedClusters

◆ fUnzippedClusterSize

◆ fUnzippedClusterSizeEst