xAOD::BranchStats Class Reference

#include <ReadStats.h>

List of all members.

Public Member Functions
	BranchStats (const char *name="xAODBranch", const char *type="Int_t",::Int_t nTreesAccessed=0,::Long64_t nReadEntries=0,::Long64_t nUnzippedBytes=0,::Long64_t nZippedBytes=0)
	Constructor specifying all parameters.
	BranchStats (const BranchStats &parent)
	Copy constructor.
BranchStats &	operator= (const BranchStats &parent)
	Assignment operator.
BranchStats &	add (const BranchStats &rh)
	Function merging two objects.
BranchStats &	operator+= (const BranchStats &rh)
	Operator merging two objects.
Accessor/setter functions for the kept information
::Int_t	treesAccessed () const
	Get how many trees/files were accessed to read this branch.
void	setTreesAccessed (::Int_t nTreesAccessed)
	Set how many trees were accessed to read this branch.
::Long64_t	readEntries () const
	Get how many entries were read from this branch.
void	setReadEntries (::Long64_t nReadEntries)
	Set how many entries were read from this branch.
::Long64_t	unzippedBytesRead () const
	Get how many unzipped bytes were read from this branch in total.
void	setUnzippedBytesRead (::Long64_t nUnzippedBytes)
	Set how many unzipped bytes were read from this branch in total.
::Long64_t	zippedBytesRead () const
	Get how many zipped bytes were read from this branch in total.
void	setZippedBytesRead (::Long64_t nZippedBytes)
	Set how many zipped bytes were read from this branch in total.
"ROOT-specific" functions
::Int_t	Merge (::TCollection *coll)
	Function merging the information from multiple objects.
void	Print (::Option_t *option="") const
	Print information about the collected statistics.

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Detailed Description

Class describing the access statistics of one (sub-)branch

Objects of this class are used to describe a single xAOD branch's access pattern.

Author:

Attila Krasznahorkay <Attila.Krasznahorkay@cern.ch>

Revision

642099

Date

2015-01-27 17:43:18 +0100 (Tue, 27 Jan 2015)

---

Constructor & Destructor Documentation

xAOD::BranchStats::BranchStats	(	const char *	name = "xAODBranch",
		const char *	type = "Int_t",
		::Int_t	nTreesAccessed = 0,
		::Long64_t	nReadEntries = 0,
		::Long64_t	nUnzippedBytes = 0,
		::Long64_t	nZippedBytes = 0
	)

Constructor specifying all parameters.

The constructor can specify all properties of the object in one go. All the parameters take a default value, to make it possible to create the object without giving the constructor any parameters. (Needed by CINT.)

Parameters:

	name	Name of the variable being described
	type	Full type name of the variable being described
	nTreesAccessed	Number of TTrees accessed to read this variable
	nReadEntries	Number of GetEntry(...) operations performed on this branch
	nUnzippedBytes	Number of bytes read after decompression
	nZippedBytes	Number of bytes physically read from disk

xAOD::BranchStats::BranchStats

(

const BranchStats &

parent

)

Copy constructor.

It's probably not needed actually, but I wanted to be explicit about how the copy constructor should behave.

Parameters:

parent

The object that's being copied

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Member Function Documentation

Int_t xAOD::BranchStats::Merge

(

::TCollection *

coll

)

Function merging the information from multiple objects.

This function makes it possible to properly merge objects coming from PROOF workers, or to properly merge objects saved in ROOT files.

Parameters:

coll

A collection of xAOD::BranchStats objects

Returns:

0 in case of failure, a positive number in case of success

BranchStats & xAOD::BranchStats::operator=

(

const BranchStats &

parent

)

Assignment operator.

The assignment operator is quite an important piece of code, as it's used all the time when using such objects in STL containers.

Parameters:

parent

The object that's being copied

Returns:

A reference to the copied object

void xAOD::BranchStats::Print

(

::Option_t *

option = ""

)

const

Print information about the collected statistics.

Standard ROOT printing function. It prints all information about the statistics gathered about a single xAOD branch.

The option parameter understands the following value(s):

• "All": Prints the most verbose information available

Parameters:

option

Possible options for the printing verbosity

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

• /cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/xAODCore/xAODCore/tools/ReadStats.h
• /cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/xAODCore/Root/ReadStats.cxx