DerivationFramework::TruthMetaDataWriter Class Reference

#include <TruthMetaDataWriter.h>

Inheritance diagram for DerivationFramework::TruthMetaDataWriter:

Collaboration diagram for DerivationFramework::TruthMetaDataWriter:

Public Member Functions
	TruthMetaDataWriter (const std::string &t, const std::string &n, const IInterface *p)
	~TruthMetaDataWriter ()
virtual StatusCode	initialize () override
virtual StatusCode	addBranches () const override

Private Attributes
ServiceHandle< StoreGateSvc >	m_metaStore
	Connection to the metadata store. More...
ServiceHandle< IHepMCWeightSvc >	m_weightSvc
	Service for retrieving the weight names. More...
xAOD::TruthMetaDataContainer *	m_tmd = nullptr
	The meta data container to be written out. More...
std::string	m_metaName
	SG key and name for meta data. More...
std::unordered_set< uint32_t >	m_existingMetaDataChan
	Set for tracking the mc channels for which we already added meta data. More...
ServiceHandle< ITagInfoMgr >	m_tagInfoMgr
	TagInfoMgr to get information out of /TagInfo. More...
SG::ReadHandleKey< xAOD::EventInfo >	m_eventInfoKey {this, "EventInfoKey", "EventInfo", "EventInfo key"}

Detailed Description

Definition at line 32 of file TruthMetaDataWriter.h.

Constructor & Destructor Documentation

TruthMetaDataWriter()

DerivationFramework::TruthMetaDataWriter::TruthMetaDataWriter	(	const std::string &	t,
		const std::string &	n,
		const IInterface *	p
	)

Definition at line 25 of file TruthMetaDataWriter.cxx.

  : base_class(t,n,p)
  , m_metaStore( "MetaDataStore", n )
  , m_weightSvc( "HepMCWeightSvc/HepMCWeightSvc" , n )
{
    declareProperty( "MetaObjectName", m_metaName = "TruthMetaData" );
    declareProperty( "MetaDataStore", m_metaStore );
}

~TruthMetaDataWriter()

DerivationFramework::TruthMetaDataWriter::~TruthMetaDataWriter

(

)

Definition at line 37 of file TruthMetaDataWriter.cxx.

                                                             {
}

Member Function Documentation

addBranches()

StatusCode DerivationFramework::TruthMetaDataWriter::addBranches ( ) const

overridevirtual

Definition at line 64 of file TruthMetaDataWriter.cxx.

{
    const EventContext& ctx = Gaudi::Hive::currentContext();
 
    //The mcChannelNumber is used as a unique identifier for which truth meta data belongs to
    uint32_t mcChannelNumber = 0;
    // If this fails, we are running on a datatype with no EventInfo.  Such data types should
    //  definitely not be mixing MC samples, so this should be safe (will fall back to 0 above)
    SG::ReadHandle<xAOD::EventInfo> eventInfo(m_eventInfoKey, ctx);
    if (eventInfo.isPresent()) {
      mcChannelNumber = eventInfo->mcChannelNumber();
    }
 
    //Inserting in a (unordered_)set returns an <iterator, boolean> pair, where the boolean
    //is used to check if the key already exists (returns false in the case it exists)
    if( m_existingMetaDataChan.insert(mcChannelNumber).second ) {
        xAOD::TruthMetaData* md = new xAOD::TruthMetaData();
        m_tmd->push_back( md );
 
        // Get the list of weights from the metadata
        std::map<std::string,std::size_t> weight_name_map = m_weightSvc->weightNames();
 
        std::vector<std::string> orderedWeightNameVec;
        orderedWeightNameVec.reserve( weight_name_map.size() );
        for (auto& entry: weight_name_map) {
            orderedWeightNameVec.push_back(entry.first);
        }
 
        //The map from the HepMC record pairs the weight names with a corresponding index,
        //it is not guaranteed that the indices are ascending when iterating over the map
        std::sort(orderedWeightNameVec.begin(), orderedWeightNameVec.end(),
                  [&](const std::string& i, const std::string& j){return weight_name_map.at(i) < weight_name_map.at(j);});
 
        md->setMcChannelNumber(mcChannelNumber);
        md->setWeightNames( orderedWeightNameVec );
 
        md->setLhefGenerator( m_tagInfoMgr->findTag("lhefGenerator") );
        md->setGenerators( m_tagInfoMgr->findTag("generators") );
        md->setEvgenProcess( m_tagInfoMgr->findTag("evgenProcess") );
        md->setEvgenTune( m_tagInfoMgr->findTag("evgenTune") );
        md->setHardPDF( m_tagInfoMgr->findTag("hardPDF") );
        md->setSoftPDF( m_tagInfoMgr->findTag("softPDF") );
        // Done getting things from the TagInfo
 
    } // Done making the new truth metadata object
    return StatusCode::SUCCESS;
}

initialize()

StatusCode DerivationFramework::TruthMetaDataWriter::initialize ( )

overridevirtual

Definition at line 41 of file TruthMetaDataWriter.cxx.

{
    ATH_MSG_VERBOSE("initialize() ...");
 
    ATH_CHECK( m_eventInfoKey.initialize() );
 
    // Initialize the service handles
    CHECK( m_metaStore.retrieve() );
    CHECK( m_weightSvc.retrieve() );
    CHECK( m_tagInfoMgr.retrieve() );
 
    // Create an empty truth meta data container:
    xAOD::TruthMetaDataAuxContainer* aux = new xAOD::TruthMetaDataAuxContainer();
    m_tmd = new xAOD::TruthMetaDataContainer();
    m_tmd->setStore( aux );
    // Record it in the metadata store
    CHECK( m_metaStore->record( aux, m_metaName + "Aux." ) );
    CHECK( m_metaStore->record( m_tmd, m_metaName ) );
 
    return StatusCode::SUCCESS;
}

Member Data Documentation

m_eventInfoKey

SG::ReadHandleKey<xAOD::EventInfo> DerivationFramework::TruthMetaDataWriter::m_eventInfoKey {this, "EventInfoKey", "EventInfo", "EventInfo key"}

private

Definition at line 55 of file TruthMetaDataWriter.h.

m_existingMetaDataChan

std::unordered_set<uint32_t> DerivationFramework::TruthMetaDataWriter::m_existingMetaDataChan

mutableprivate

Set for tracking the mc channels for which we already added meta data.

Definition at line 50 of file TruthMetaDataWriter.h.

m_metaName

std::string DerivationFramework::TruthMetaDataWriter::m_metaName

private

SG key and name for meta data.

Definition at line 48 of file TruthMetaDataWriter.h.

m_metaStore

ServiceHandle< StoreGateSvc > DerivationFramework::TruthMetaDataWriter::m_metaStore

private

Connection to the metadata store.

Definition at line 42 of file TruthMetaDataWriter.h.

m_tagInfoMgr

ServiceHandle< ITagInfoMgr > DerivationFramework::TruthMetaDataWriter::m_tagInfoMgr

private

Initial value:

{
        "TagInfoMgr", name()}

TagInfoMgr to get information out of /TagInfo.

Definition at line 52 of file TruthMetaDataWriter.h.

m_tmd

xAOD::TruthMetaDataContainer* DerivationFramework::TruthMetaDataWriter::m_tmd = nullptr

private

The meta data container to be written out.

Definition at line 46 of file TruthMetaDataWriter.h.

m_weightSvc

ServiceHandle< IHepMCWeightSvc > DerivationFramework::TruthMetaDataWriter::m_weightSvc

private

Service for retrieving the weight names.

Definition at line 44 of file TruthMetaDataWriter.h.

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

• TruthMetaDataWriter.h
• TruthMetaDataWriter.cxx