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Reference Guide
ROOT::Experimental::RNTupleWriter Class Reference


An RNTuple that gets filled with entries (data) and writes them to storage

An output ntuple can be filled with entries. The caller has to make sure that the data that gets filled into an ntuple 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 Flush() or by destructing the ntuple. On I/O errors, an exception is thrown.

Definition at line 169 of file RNTuple.hxx.

Public Member Functions

 RNTupleWriter (std::unique_ptr< RNTupleModel > model, std::unique_ptr< Detail::RPageSink > sink)
 
 RNTupleWriter (const RNTupleWriter &)=delete
 
 ~RNTupleWriter ()
 
void CommitCluster ()
 Ensure that the data from the so far seen Fill calls has been written to storage. More...
 
void Fill ()
 The simplest user interface if the default entry that comes with the ntuple model is used. More...
 
void Fill (REntry *entry)
 Multiple entries can have been instantiated from the tnuple model. More...
 
RNTupleWriteroperator= (const RNTupleWriter &)=delete
 

Static Public Member Functions

static std::unique_ptr< RNTupleWriterRecreate (std::unique_ptr< RNTupleModel > model, std::string_view ntupleName, std::string_view storage, const RNTupleWriteOptions &options=RNTupleWriteOptions())
 

Private Attributes

NTupleSize_t fClusterSizeEntries
 
NTupleSize_t fLastCommitted
 
std::unique_ptr< RNTupleModelfModel
 Needs to be destructed before fSink. More...
 
NTupleSize_t fNEntries
 
std::unique_ptr< Detail::RPageSinkfSink
 

Static Private Attributes

static constexpr NTupleSize_t kDefaultClusterSizeEntries = 64000
 

#include <ROOT/RNTuple.hxx>

Constructor & Destructor Documentation

◆ RNTupleWriter() [1/2]

ROOT::Experimental::RNTupleWriter::RNTupleWriter ( std::unique_ptr< RNTupleModel model,
std::unique_ptr< Detail::RPageSink sink 
)

Definition at line 176 of file RNTuple.cxx.

◆ RNTupleWriter() [2/2]

ROOT::Experimental::RNTupleWriter::RNTupleWriter ( const RNTupleWriter )
delete

◆ ~RNTupleWriter()

ROOT::Experimental::RNTupleWriter::~RNTupleWriter ( )

Definition at line 188 of file RNTuple.cxx.

Member Function Documentation

◆ CommitCluster()

void ROOT::Experimental::RNTupleWriter::CommitCluster ( )

Ensure that the data from the so far seen Fill calls has been written to storage.

Definition at line 204 of file RNTuple.cxx.

◆ Fill() [1/2]

void ROOT::Experimental::RNTupleWriter::Fill ( )
inline

The simplest user interface if the default entry that comes with the ntuple model is used.

Definition at line 190 of file RNTuple.hxx.

◆ Fill() [2/2]

void ROOT::Experimental::RNTupleWriter::Fill ( REntry entry)
inline

Multiple entries can have been instantiated from the tnuple model.

This method will perform a light check whether the entry comes from the ntuple's own model

Definition at line 193 of file RNTuple.hxx.

◆ operator=()

RNTupleWriter& ROOT::Experimental::RNTupleWriter::operator= ( const RNTupleWriter )
delete

◆ Recreate()

std::unique_ptr< ROOT::Experimental::RNTupleWriter > ROOT::Experimental::RNTupleWriter::Recreate ( std::unique_ptr< RNTupleModel model,
std::string_view  ntupleName,
std::string_view  storage,
const RNTupleWriteOptions options = RNTupleWriteOptions() 
)
static

Definition at line 194 of file RNTuple.cxx.

Member Data Documentation

◆ fClusterSizeEntries

NTupleSize_t ROOT::Experimental::RNTupleWriter::fClusterSizeEntries
private

Definition at line 175 of file RNTuple.hxx.

◆ fLastCommitted

NTupleSize_t ROOT::Experimental::RNTupleWriter::fLastCommitted
private

Definition at line 176 of file RNTuple.hxx.

◆ fModel

std::unique_ptr<RNTupleModel> ROOT::Experimental::RNTupleWriter::fModel
private

Needs to be destructed before fSink.

Definition at line 174 of file RNTuple.hxx.

◆ fNEntries

NTupleSize_t ROOT::Experimental::RNTupleWriter::fNEntries
private

Definition at line 177 of file RNTuple.hxx.

◆ fSink

std::unique_ptr<Detail::RPageSink> ROOT::Experimental::RNTupleWriter::fSink
private

Definition at line 172 of file RNTuple.hxx.

◆ kDefaultClusterSizeEntries

constexpr NTupleSize_t ROOT::Experimental::RNTupleWriter::kDefaultClusterSizeEntries = 64000
staticprivate

Definition at line 171 of file RNTuple.hxx.


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