Gaudi::Histograming::Sink Namespace Reference

Namespaces
	details

Classes
class	Base
struct	Root
struct	Traits
	templated Traits dealing with Root Histogram filling for standard histograms More...
struct	Traits< false, RootHisto, N >
	Specialization of Traits dealing with non profile Root Histograms. More...
struct	Traits< true, RootHisto, N >
	Specialization of Traits dealing with profile Root Histograms. More...

Functions
template<typename Traits >
std::tuple< typename Traits::Histo, std::string >	jsonToRootHistogram (std::string &dir, std::string &name, nlohmann::json const &j)
	generic function to convert json to a ROOT Histogram More...
template<typename Histo >
nlohmann::json	rootHistogramTojson (Histo const &)
	generic function to convert a ROOT Histogram to json More...
template<typename Traits >
void	saveRootHisto (TFile &file, std::string dir, std::string name, nlohmann::json const &j)
	generic method to save histograms to files, based on Traits More...
template<unsigned int N, bool isProfile, typename ROOTHisto >
void	saveRootHisto (TFile &file, std::string dir, std::string name, nlohmann::json const &j)
	generic method to save regular histograms to files More...

Function Documentation

jsonToRootHistogram()

template<typename Traits >

std::tuple< typename Traits::Histo, std::string > Gaudi::Histograming::Sink::jsonToRootHistogram	(	std::string &	dir,
		std::string &	name,
		nlohmann::json const &	j
	)

generic function to convert json to a ROOT Histogram

returns the Root histogram and the dir where to save it in the Root file This may be different from input dir in case name has slashes

Definition at line 378 of file Utils.h.

                                                                                               {
    return details::jsonToRootHistogramInternal<Traits>( dir, name, j, std::make_index_sequence<Traits::Dimension>() );
  }

rootHistogramTojson()

template<typename Histo >

nlohmann::json Gaudi::Histograming::Sink::rootHistogramTojson

(

Histo const &

)

generic function to convert a ROOT Histogram to json

essentially used for backward compatibility of old HistogramService with MonitoringHub

saveRootHisto() [1/2]

template<typename Traits >

void Gaudi::Histograming::Sink::saveRootHisto	(	TFile &	file,
		std::string	dir,
		std::string	name,
		nlohmann::json const &	j
	)

generic method to save histograms to files, based on Traits

Definition at line 384 of file Utils.h.

                                                                                          {
    // get the Root histogram
    auto [histo, newDir] = jsonToRootHistogram<Traits>( dir, name, j );
    // Change to the proper directory in the ROOT file
    auto previousDir = details::changeDir( file, newDir );
    // write to file
    histo.Write();
    // switch back to the previous directory
    previousDir->cd();
  }

saveRootHisto() [2/2]

template<unsigned int N, bool isProfile, typename ROOTHisto >

void Gaudi::Histograming::Sink::saveRootHisto	(	TFile &	file,
		std::string	dir,
		std::string	name,
		nlohmann::json const &	j
	)

generic method to save regular histograms to files

Can be used in most cases as the handler function to register into Sink::Base contains all the boiler plate code and redirects specific code to the adapted Traits template

Definition at line 396 of file Utils.h.

                                                                                          {
    saveRootHisto<Traits<isProfile, ROOTHisto, N>>( file, std::move( dir ), std::move( name ), j );
  }