Class implementing or helping the various TTree cloning method.

Definition at line 38 of file TTreeCloner.h.

Classes
class	CompareEntry

class	CompareSeek

Public Types
enum	EClonerOptions { kNone = 0, kNoWarnings = BIT(1), kIgnoreMissingTopLevel = BIT(2), kNoFileCache = BIT(3) }

Public Member Functions
	TTreeCloner (TTree from, TTree to, Option_t *method, UInt_t options=kNone)
	Constructor. More...

virtual	~TTreeCloner ()
	TTreeCloner destructor. More...

void	CloseOutWriteBaskets ()
	Before we can start adding new basket, we need to flush to disk the partially filled baskets (the WriteBasket) More...

void	CollectBaskets ()
	Collect the information about the on-file basket that need to be copied. More...

UInt_t	CollectBranches (TBranch from, TBranch to)
	Fill the array of branches, adding the branch 'from' and 'to', and matching the sub-branches of the 'from' and 'to' branches. More...

UInt_t	CollectBranches (TObjArray from, TObjArray to)
	Fill the array of branches, matching the branches of the 'from' and 'to' arrays. More...

UInt_t	CollectBranches ()
	Fill the array of branches, matching the branches of the 'from' and 'to' TTrees Returns the total number of baskets in all the branches. More...

void	CopyMemoryBaskets ()
	Transfer the basket from the input file to the output file. More...

void	CopyProcessIds ()
	Make sure that all the needed TStreamerInfo are present in the output file. More...

void	CopyStreamerInfos ()
	Make sure that all the needed TStreamerInfo are present in the output file. More...

Bool_t	Exec ()
	Execute the cloning. More...

const char *	GetWarning () const

Bool_t	IsValid ()

Bool_t	NeedConversion ()

void	SetCacheSize (Int_t size)
	Set the TFile cache size to be used. More...

void	SortBaskets ()
	Sort the basket according to the user request. More...

void	WriteBaskets ()
	Transfer the basket from the input file to the output file. More...

Private Types
enum	ECloneMethod { kDefault = 0, kSortBasketsByBranch = 1, kSortBasketsByOffset = 2, kSortBasketsByEntry = 3 }

Private Member Functions
	TTreeCloner (const TTreeCloner &)=delete

void	CreateCache ()
	Create a TFileCacheRead if it was requested. More...

UInt_t	FillCache (UInt_t from)
	Fill the file cache with the next set of basket. More...

void	ImportClusterRanges ()
	Set the entries and import the cluster range of the. More...

TTreeCloner &	operator= (const TTreeCloner &)=delete

void	RestoreCache ()
	Restore the TFileCacheRead to its previous value. More...

Private Attributes
UInt_t *	fBasketBranchNum
	[fMaxBaskets] Index of the branch(es) of the basket. More...

Long64_t *	fBasketEntry
	[fMaxBaskets] list of basket start entries. More...

UInt_t *	fBasketIndex
	[fMaxBaskets] ordered list of basket indices to be written. More...

UInt_t *	fBasketNum
	[fMaxBaskets] index of the basket within the branch. More...

Long64_t *	fBasketSeek
	[fMaxBaskets] list of basket position to be read. More...

Int_t	fCacheSize
	Requested size of the file cache. More...

UInt_t	fCloneMethod
	Indicates which cloning method was selected. More...

TFileCacheRead *	fFileCache
	File Cache used to reduce the number of individual reads. More...

TObjArray	fFromBranches

TTree *	fFromTree

Bool_t	fIsValid

UInt_t	fMaxBaskets

Option_t *	fMethod

Bool_t	fNeedConversion
	True if the fast merge is not possible but a slow merge might possible. More...

UInt_t	fOptions

UShort_t	fPidOffset
	Offset to be added to the copied key/basket. More...

TFileCacheRead *	fPrevCache
	Cache that set before the TTreeCloner ctor for the 'from' TTree if any. More...

TObjArray	fToBranches

Long64_t	fToStartEntries
	Number of entries in the target tree before any addition. More...

TTree *	fToTree

TString	fWarningMsg
	Text of the error message lead to an 'invalid' state. More...

Friends
class	CompareEntry

class	CompareSeek

#include <TTreeCloner.h>

Member Enumeration Documentation

◆ ECloneMethod

enum TTreeCloner::ECloneMethod

private

Enumerator
kDefault
kSortBasketsByBranch
kSortBasketsByOffset
kSortBasketsByEntry

Definition at line 67 of file TTreeCloner.h.

◆ EClonerOptions

enum TTreeCloner::EClonerOptions

Enumerator
kNone
kNoWarnings
kIgnoreMissingTopLevel
kNoFileCache

Definition at line 101 of file TTreeCloner.h.

Constructor & Destructor Documentation

◆ TTreeCloner() [1/2]

TTreeCloner::TTreeCloner ( const TTreeCloner & )

privatedelete

◆ TTreeCloner() [2/2]

TTreeCloner::TTreeCloner	(	TTree *	from,
		TTree *	to,
		Option_t *	method,
		UInt_t	options = `kNone`
	)

Constructor.

This object would transfer the data from 'from' to 'to' using the method indicated in method.

The value of the parameter 'method' determines in which order the branches' baskets are written to the output file.

When a TTree is filled the data is stored in the individual branches' basket. Each basket is written individually to the disk as soon as it is full. In consequence the baskets of branches that contain 'large' data chunk are written to the disk more often.

There is currently 3 supported sorting order:

SortBasketsByOffset (the default)
SortBasketsByBranch
SortBasketsByEntry

When using SortBasketsByOffset the baskets are written in the output file in the same order as in the original file (i.e. the basket are sorted on their offset in the original file; Usually this also means that the baskets are sorted on the index/number of the last entry they contain)

When using SortBasketsByBranch all the baskets of each individual branches are stored contiguously. This tends to optimize reading speed when reading a small number (1->5) of branches, since all their baskets will be clustered together instead of being spread across the file. However it might decrease the performance when reading more branches (or the full entry).

When using SortBasketsByEntry the baskets with the lowest starting entry are written first. (i.e. the baskets are sorted on the index/number of the first entry they contain). This means that on the file the baskets will be in the order in which they will be needed when reading the whole tree sequentially.

Definition at line 103 of file TTreeCloner.cxx.

◆ ~TTreeCloner()

TTreeCloner::~TTreeCloner ( )

virtual

TTreeCloner destructor.

Definition at line 216 of file TTreeCloner.cxx.

Member Function Documentation

◆ CloseOutWriteBaskets()

void TTreeCloner::CloseOutWriteBaskets ( )

Before we can start adding new basket, we need to flush to disk the partially filled baskets (the WriteBasket)

Definition at line 232 of file TTreeCloner.cxx.

◆ CollectBaskets()

void TTreeCloner::CollectBaskets ( )

Collect the information about the on-file basket that need to be copied.

Definition at line 418 of file TTreeCloner.cxx.

◆ CollectBranches() [1/3]

UInt_t TTreeCloner::CollectBranches	(	TBranch *	from,
		TBranch *	to
	)

Fill the array of branches, adding the branch 'from' and 'to', and matching the sub-branches of the 'from' and 'to' branches.

Returns the total number of baskets in all the from branch and it sub-branches.

Definition at line 246 of file TTreeCloner.cxx.

◆ CollectBranches() [2/3]

UInt_t TTreeCloner::CollectBranches	(	TObjArray *	from,
		TObjArray *	to
	)

Fill the array of branches, matching the branches of the 'from' and 'to' arrays.

Returns the total number of baskets in all the branches.

Definition at line 332 of file TTreeCloner.cxx.

◆ CollectBranches() [3/3]

UInt_t TTreeCloner::CollectBranches ( )

Fill the array of branches, matching the branches of the 'from' and 'to' TTrees Returns the total number of baskets in all the branches.

Definition at line 397 of file TTreeCloner.cxx.

◆ CopyMemoryBaskets()

void TTreeCloner::CopyMemoryBaskets ( )

Transfer the basket from the input file to the output file.

Definition at line 480 of file TTreeCloner.cxx.

◆ CopyProcessIds()

void TTreeCloner::CopyProcessIds ( )

Make sure that all the needed TStreamerInfo are present in the output file.

Definition at line 507 of file TTreeCloner.cxx.

◆ CopyStreamerInfos()

void TTreeCloner::CopyStreamerInfos ( )

Make sure that all the needed TStreamerInfo are present in the output file.

Definition at line 439 of file TTreeCloner.cxx.

◆ CreateCache()

void TTreeCloner::CreateCache ( )

private

Create a TFileCacheRead if it was requested.

Definition at line 560 of file TTreeCloner.cxx.

◆ Exec()

Bool_t TTreeCloner::Exec ( )

Execute the cloning.

Definition at line 194 of file TTreeCloner.cxx.

◆ FillCache()

UInt_t TTreeCloner::FillCache ( UInt_t from )

private

Fill the file cache with the next set of basket.

Parameters

from	index of the first lement of fFromBranches to start caching

Returns: The index of first element of fFromBranches that is not in the cache

Definition at line 659 of file TTreeCloner.cxx.

◆ GetWarning()

const char* TTreeCloner::GetWarning ( ) const

inline

Definition at line 119 of file TTreeCloner.h.

◆ ImportClusterRanges()

void TTreeCloner::ImportClusterRanges ( )

private

Set the entries and import the cluster range of the.

Definition at line 590 of file TTreeCloner.cxx.

◆ IsValid()

Bool_t TTreeCloner::IsValid ( )

inline

Definition at line 121 of file TTreeCloner.h.

◆ NeedConversion()

Bool_t TTreeCloner::NeedConversion ( )

inline

Definition at line 122 of file TTreeCloner.h.

◆ operator=()

TTreeCloner& TTreeCloner::operator= ( const TTreeCloner & )

privatedelete

◆ RestoreCache()

void TTreeCloner::RestoreCache ( )

private

Restore the TFileCacheRead to its previous value.

Definition at line 579 of file TTreeCloner.cxx.

◆ SetCacheSize()

void TTreeCloner::SetCacheSize ( Int_t size )

Set the TFile cache size to be used.

Note that the default is to use the same size as the default TTreeCache for the input tree.

Parameters

size	Size of the cache. Zero disable the use of the cache.

Definition at line 613 of file TTreeCloner.cxx.

◆ SortBaskets()

void TTreeCloner::SortBaskets ( )

Sort the basket according to the user request.

Definition at line 631 of file TTreeCloner.cxx.

◆ WriteBaskets()

void TTreeCloner::WriteBaskets ( )

Transfer the basket from the input file to the output file.

Definition at line 686 of file TTreeCloner.cxx.

Friends And Related Function Documentation

◆ CompareEntry

friend class CompareEntry

friend

Definition at line 89 of file TTreeCloner.h.

◆ CompareSeek

friend class CompareSeek

friend

Definition at line 88 of file TTreeCloner.h.

Member Data Documentation

◆ fBasketBranchNum

UInt_t* TTreeCloner::fBasketBranchNum

private

[fMaxBaskets] Index of the branch(es) of the basket.

Definition at line 51 of file TTreeCloner.h.

◆ fBasketEntry

Long64_t* TTreeCloner::fBasketEntry

private

[fMaxBaskets] list of basket start entries.

Definition at line 55 of file TTreeCloner.h.

◆ fBasketIndex

UInt_t* TTreeCloner::fBasketIndex

private

[fMaxBaskets] ordered list of basket indices to be written.

Definition at line 56 of file TTreeCloner.h.

◆ fBasketNum

UInt_t* TTreeCloner::fBasketNum

private

[fMaxBaskets] index of the basket within the branch.

Definition at line 52 of file TTreeCloner.h.

◆ fBasketSeek

Long64_t* TTreeCloner::fBasketSeek

private

[fMaxBaskets] list of basket position to be read.

Definition at line 54 of file TTreeCloner.h.

◆ fCacheSize

Int_t TTreeCloner::fCacheSize

private

Requested size of the file cache.

Definition at line 63 of file TTreeCloner.h.

◆ fCloneMethod

UInt_t TTreeCloner::fCloneMethod

private

Indicates which cloning method was selected.

Definition at line 60 of file TTreeCloner.h.

◆ fFileCache

TFileCacheRead* TTreeCloner::fFileCache

private

File Cache used to reduce the number of individual reads.

Definition at line 64 of file TTreeCloner.h.

◆ fFromBranches

TObjArray TTreeCloner::fFromBranches

private

Definition at line 47 of file TTreeCloner.h.

◆ fFromTree

TTree* TTreeCloner::fFromTree

private

Definition at line 44 of file TTreeCloner.h.

◆ fIsValid

Bool_t TTreeCloner::fIsValid

private

Definition at line 41 of file TTreeCloner.h.

◆ fMaxBaskets

UInt_t TTreeCloner::fMaxBaskets

private

Definition at line 50 of file TTreeCloner.h.

◆ fMethod

Option_t* TTreeCloner::fMethod

private

Definition at line 46 of file TTreeCloner.h.

◆ fNeedConversion

Bool_t TTreeCloner::fNeedConversion

private

True if the fast merge is not possible but a slow merge might possible.

Definition at line 42 of file TTreeCloner.h.

◆ fOptions

UInt_t TTreeCloner::fOptions

private

Definition at line 43 of file TTreeCloner.h.

◆ fPidOffset

UShort_t TTreeCloner::fPidOffset

private

Offset to be added to the copied key/basket.

Definition at line 58 of file TTreeCloner.h.

◆ fPrevCache

TFileCacheRead* TTreeCloner::fPrevCache

private

Cache that set before the TTreeCloner ctor for the 'from' TTree if any.

Definition at line 65 of file TTreeCloner.h.

◆ fToBranches

TObjArray TTreeCloner::fToBranches

private

Definition at line 48 of file TTreeCloner.h.

◆ fToStartEntries

Long64_t TTreeCloner::fToStartEntries

private

Number of entries in the target tree before any addition.

Definition at line 61 of file TTreeCloner.h.

◆ fToTree

TTree* TTreeCloner::fToTree

private

Definition at line 45 of file TTreeCloner.h.

◆ fWarningMsg

TString TTreeCloner::fWarningMsg

private

Text of the error message lead to an 'invalid' state.

Definition at line 39 of file TTreeCloner.h.

Libraries for TTreeCloner:

[legend]

Classes

Public Types

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Friends

Member Enumeration Documentation

◆ ECloneMethod

◆ EClonerOptions

Constructor & Destructor Documentation

◆ TTreeCloner() [1/2]

◆ TTreeCloner() [2/2]

◆ ~TTreeCloner()

Member Function Documentation

◆ CloseOutWriteBaskets()

◆ CollectBaskets()

◆ CollectBranches() [1/3]

◆ CollectBranches() [2/3]

◆ CollectBranches() [3/3]

◆ CopyMemoryBaskets()

◆ CopyProcessIds()

◆ CopyStreamerInfos()

◆ CreateCache()

◆ Exec()

◆ FillCache()

◆ GetWarning()

◆ ImportClusterRanges()

◆ IsValid()

◆ NeedConversion()

◆ operator=()

◆ RestoreCache()

◆ SetCacheSize()

◆ SortBaskets()

◆ WriteBaskets()

Friends And Related Function Documentation

◆ CompareEntry

◆ CompareSeek

Member Data Documentation

◆ fBasketBranchNum

◆ fBasketEntry

◆ fBasketIndex

◆ fBasketNum

◆ fBasketSeek

◆ fCacheSize

◆ fCloneMethod

◆ fFileCache

◆ fFromBranches

◆ fFromTree

◆ fIsValid

◆ fMaxBaskets

◆ fMethod

◆ fNeedConversion

◆ fOptions

◆ fPidOffset

◆ fPrevCache

◆ fToBranches

◆ fToStartEntries

◆ fToTree

◆ fWarningMsg