Virtual storage that combines several other sources horizontally.

Definition at line 39 of file RPageSourceFriends.hxx.

Classes
struct	RIdBiMap
	A bi-directional map of descriptor IDs that translates from physical to virtual column, field, and cluster IDs and vice versa. More...

struct	ROriginId

Public Member Functions
	RPageSourceFriends (std::string_view ntupleName, std::span< std::unique_ptr< RPageSource > > sources)

	~RPageSourceFriends () final

ColumnHandle_t	AddColumn (DescriptorId_t fieldId, const RColumn &column) final
	Register a new column.

std::unique_ptr< RPageSource >	Clone () const final
	Open the same storage multiple time, e.g. for reading in multiple threads.

void	DropColumn (ColumnHandle_t columnHandle) final
	Unregisters a column.

RNTupleMetrics &	GetMetrics () final
	Returns the default metrics object. Subclasses might alternatively override the method and provide their own metrics object.

std::vector< std::unique_ptr< RCluster > >	LoadClusters (std::span< RCluster::RKey > clusterKeys) final
	Populates all the pages of the given cluster ids and columns; it is possible that some columns do not contain any pages.

void	LoadSealedPage (DescriptorId_t columnId, const RClusterIndex &clusterIndex, RSealedPage &sealedPage) final
	Read the packed and compressed bytes of a page into the memory buffer provided by selaedPage.

RPage	PopulatePage (ColumnHandle_t columnHandle, const RClusterIndex &clusterIndex) final
	Another version of PopulatePage that allows to specify cluster-relative indexes.

RPage	PopulatePage (ColumnHandle_t columnHandle, NTupleSize_t globalIndex) final
	Allocates and fills a page that contains the index-th element.

void	ReleasePage (RPage &page) final
	Every page store needs to be able to free pages it handed out.

Public Member Functions inherited from ROOT::Experimental::Detail::RPageSource
	RPageSource (const RPageSource &)=delete

	RPageSource (RPageSource &&)=default

	RPageSource (std::string_view ntupleName, const RNTupleReadOptions &fOptions)

virtual	~RPageSource ()

void	Attach ()
	Open the physical storage container for the tree.

ColumnId_t	GetColumnId (ColumnHandle_t columnHandle)

const RNTupleDescriptor &	GetDescriptor () const

NTupleSize_t	GetNElements (ColumnHandle_t columnHandle)

NTupleSize_t	GetNEntries ()

const RNTupleReadOptions &	GetReadOptions () const

EPageStorageType	GetType () final
	Whether the concrete implementation is a sink or a source.

RPageSource &	operator= (const RPageSource &)=delete

RPageSource &	operator= (RPageSource &&)=default

void	UnzipCluster (RCluster *cluster)
	Parallel decompression and unpacking of the pages in the given cluster.

Public Member Functions inherited from ROOT::Experimental::Detail::RPageStorage
	RPageStorage (const RPageStorage &other)=delete

	RPageStorage (RPageStorage &&other)=default

	RPageStorage (std::string_view name)

virtual	~RPageStorage ()

const std::string &	GetNTupleName () const
	Returns the NTuple name.

RPageStorage &	operator= (const RPageStorage &other)=delete

RPageStorage &	operator= (RPageStorage &&other)=default

void	SetTaskScheduler (RTaskScheduler *taskScheduler)

Protected Member Functions
RNTupleDescriptor	AttachImpl () final

Protected Member Functions inherited from ROOT::Experimental::Detail::RPageSource
void	EnableDefaultMetrics (const std::string &prefix)
	Enables the default set of metrics provided by RPageSource.

std::unique_ptr< unsigned char[]>	UnsealPage (const RSealedPage &sealedPage, const RColumnElementBase &element)
	Helper for unstreaming a page.

virtual void	UnzipClusterImpl (RCluster *)

Private Member Functions
void	AddVirtualField (std::size_t originIdx, const RFieldDescriptor &originField, DescriptorId_t virtualParent, const std::string &virtualName)

Private Attributes
RNTupleDescriptorBuilder	fBuilder

RIdBiMap	fIdBiMap

RNTupleMetrics	fMetrics

DescriptorId_t	fNextId = 1
	0 is reserved for the friend zero field

std::vector< std::unique_ptr< RPageSource > >	fSources

Additional Inherited Members
Public Types inherited from ROOT::Experimental::Detail::RPageStorage
using	ColumnHandle_t = RColumnHandle
	The column handle identifies a column with the current open page storage.

Static Public Member Functions inherited from ROOT::Experimental::Detail::RPageSource
static std::unique_ptr< RPageSource >	Create (std::string_view ntupleName, std::string_view location, const RNTupleReadOptions &options=RNTupleReadOptions())
	Guess the concrete derived page source from the file name (location)

Protected Attributes inherited from ROOT::Experimental::Detail::RPageSource
RCluster::ColumnSet_t	fActiveColumns
	The active columns are implicitly defined by the model fields or views.

std::unique_ptr< RCounters >	fCounters

std::unique_ptr< RNTupleDecompressor >	fDecompressor
	Helper to unzip pages and header/footer; comprises a 16MB (kMAXZIPBUF) unzip buffer.

RNTupleDescriptor	fDescriptor

RNTupleMetrics	fMetrics
	Wraps the I/O counters and is observed by the RNTupleReader metrics.

RNTupleReadOptions	fOptions

Protected Attributes inherited from ROOT::Experimental::Detail::RPageStorage
std::string	fNTupleName

RTaskScheduler *	fTaskScheduler = nullptr

#include <ROOT/RPageSourceFriends.hxx>

Inheritance diagram for ROOT::Experimental::Detail::RPageSourceFriends:

[legend]

Constructor & Destructor Documentation

◆ RPageSourceFriends()

ROOT::Experimental::Detail::RPageSourceFriends::RPageSourceFriends	(	std::string_view	ntupleName,
		std::span< std::unique_ptr< RPageSource > >	sources
	)

Definition at line 24 of file RPageSourceFriends.cxx.

◆ ~RPageSourceFriends()

ROOT::Experimental::Detail::RPageSourceFriends::~RPageSourceFriends ( )

finaldefault

Member Function Documentation

◆ AddColumn()

ROOT::Experimental::Detail::RPageStorage::ColumnHandle_t ROOT::Experimental::Detail::RPageSourceFriends::AddColumn	(	DescriptorId_t	fieldId,
		const RColumn &	column
	)

finalvirtual

Register a new column.

When reading, the column must exist in the ntuple on disk corresponding to the meta-data. When writing, every column can only be attached once.

Reimplemented from ROOT::Experimental::Detail::RPageSource.

Definition at line 128 of file RPageSourceFriends.cxx.

◆ AddVirtualField()

void ROOT::Experimental::Detail::RPageSourceFriends::AddVirtualField	(	std::size_t	originIdx,
		const RFieldDescriptor &	originField,
		DescriptorId_t	virtualParent,
		const std::string &	virtualName
	)

private

Definition at line 38 of file RPageSourceFriends.cxx.

◆ AttachImpl()

ROOT::Experimental::RNTupleDescriptor ROOT::Experimental::Detail::RPageSourceFriends::AttachImpl ( )

finalprotectedvirtual

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 65 of file RPageSourceFriends.cxx.

◆ Clone()

std::unique_ptr< ROOT::Experimental::Detail::RPageSource > ROOT::Experimental::Detail::RPageSourceFriends::Clone ( ) const

finalvirtual

Open the same storage multiple time, e.g. for reading in multiple threads.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 118 of file RPageSourceFriends.cxx.

◆ DropColumn()

void ROOT::Experimental::Detail::RPageSourceFriends::DropColumn ( ColumnHandle_t columnHandle )

finalvirtual

Unregisters a column.

A page source decreases the reference counter for the corresponding active column. For a page sink, dropping columns is currently a no-op.

Reimplemented from ROOT::Experimental::Detail::RPageSource.

Definition at line 135 of file RPageSourceFriends.cxx.

◆ GetMetrics()

RNTupleMetrics & ROOT::Experimental::Detail::RPageSourceFriends::GetMetrics ( )

inlinefinalvirtual

Returns the default metrics object. Subclasses might alternatively override the method and provide their own metrics object.

Reimplemented from ROOT::Experimental::Detail::RPageSource.

Definition at line 108 of file RPageSourceFriends.hxx.

◆ LoadClusters()

std::vector< std::unique_ptr< ROOT::Experimental::Detail::RCluster > > ROOT::Experimental::Detail::RPageSourceFriends::LoadClusters ( std::span< RCluster::RKey > clusterKeys )

finalvirtual

Populates all the pages of the given cluster ids and columns; it is possible that some columns do not contain any pages.

The page source may load more columns than the minimal necessary set from columns. To indicate which columns have been loaded, LoadClusters() must mark them with SetColumnAvailable(). That includes the ones from the columns that don't have pages; otherwise subsequent requests for the cluster would assume an incomplete cluster and trigger loading again. LoadClusters() is typically called from the I/O thread of a cluster pool, i.e. the method runs concurrently to other methods of the page source.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 201 of file RPageSourceFriends.cxx.

◆ LoadSealedPage()

void ROOT::Experimental::Detail::RPageSourceFriends::LoadSealedPage	(	DescriptorId_t	columnId,
		const RClusterIndex &	clusterIndex,
		RSealedPage &	sealedPage
	)

finalvirtual

Read the packed and compressed bytes of a page into the memory buffer provided by selaedPage.

The sealed page can be used subsequently in a call to RPageSink::CommitSealedPage. The fSize and fNElements member of the sealedPage parameters are always set. If sealedPage.fBuffer is nullptr, no data will be copied but the returned size information can be used by the caller to allocate a large enough buffer and call LoadSealedPage again.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 179 of file RPageSourceFriends.cxx.

◆ PopulatePage() [1/2]

ROOT::Experimental::Detail::RPage ROOT::Experimental::Detail::RPageSourceFriends::PopulatePage	(	ColumnHandle_t	columnHandle,
		const RClusterIndex &	clusterIndex
	)

finalvirtual

Another version of PopulatePage that allows to specify cluster-relative indexes.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 162 of file RPageSourceFriends.cxx.

◆ PopulatePage() [2/2]

ROOT::Experimental::Detail::RPage ROOT::Experimental::Detail::RPageSourceFriends::PopulatePage	(	ColumnHandle_t	columnHandle,
		NTupleSize_t	globalIndex
	)

finalvirtual

Allocates and fills a page that contains the index-th element.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 145 of file RPageSourceFriends.cxx.

◆ ReleasePage()

void ROOT::Experimental::Detail::RPageSourceFriends::ReleasePage ( RPage & page )

finalvirtual

Every page store needs to be able to free pages it handed out.

But Sinks and sources have different means of allocating pages.

Implements ROOT::Experimental::Detail::RPageStorage.

Definition at line 191 of file RPageSourceFriends.cxx.

Member Data Documentation

◆ fBuilder

RNTupleDescriptorBuilder ROOT::Experimental::Detail::RPageSourceFriends::fBuilder

private

Definition at line 80 of file RPageSourceFriends.hxx.

◆ fIdBiMap

RIdBiMap ROOT::Experimental::Detail::RPageSourceFriends::fIdBiMap

private

Definition at line 78 of file RPageSourceFriends.hxx.

◆ fMetrics

RNTupleMetrics ROOT::Experimental::Detail::RPageSourceFriends::fMetrics

private

Definition at line 76 of file RPageSourceFriends.hxx.

◆ fNextId

DescriptorId_t ROOT::Experimental::Detail::RPageSourceFriends::fNextId = 1

private

0 is reserved for the friend zero field

Definition at line 81 of file RPageSourceFriends.hxx.

◆ fSources

std::vector<std::unique_ptr<RPageSource> > ROOT::Experimental::Detail::RPageSourceFriends::fSources

private

Definition at line 77 of file RPageSourceFriends.hxx.

Libraries for ROOT::Experimental::Detail::RPageSourceFriends:

[legend]

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

tree/ntuple/v7/inc/ROOT/RPageSourceFriends.hxx
tree/ntuple/v7/src/RPageSourceFriends.cxx

Classes

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RPageSourceFriends()

◆ ~RPageSourceFriends()

Member Function Documentation

◆ AddColumn()

◆ AddVirtualField()

◆ AttachImpl()

◆ Clone()

◆ DropColumn()

◆ GetMetrics()

◆ LoadClusters()

◆ LoadSealedPage()

◆ PopulatePage() [1/2]

◆ PopulatePage() [2/2]

◆ ReleasePage()

Member Data Documentation

◆ fBuilder

◆ fIdBiMap

◆ fMetrics

◆ fNextId

◆ fSources