PrdAssociationAlg.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#include "src/PrdAssociationAlg.h"
#include "Acts/EventData/TrackStateType.hpp"
#include "ActsGeometry/ATLASSourceLink.h"
#include "xAODMeasurementBase/MeasurementDefs.h"
#include <utility>
 
namespace ActsTrk {
 
  PrdAssociationAlg::PrdAssociationAlg(const std::string& name,
                       ISvcLocator* pSvcLocator)
    : AthReentrantAlgorithm(name, pSvcLocator)
  {}
 
  StatusCode PrdAssociationAlg::initialize()
  {
    ATH_MSG_DEBUG("Initializing " << name() << " ...");
 
    ATH_CHECK(m_inputTrackCollections.initialize());
    ATH_CHECK(m_inputPrdMap.initialize(not m_inputPrdMap.empty()));
    ATH_CHECK(m_outputPrdMap.initialize());
    
    return StatusCode::SUCCESS;
  }
 
  StatusCode PrdAssociationAlg::execute(const EventContext& ctx) const
  {
    ATH_MSG_DEBUG("Executing " << name() << " ...");
    
    ATH_MSG_DEBUG("Retrieving track collection with key: " << m_inputTrackCollections.key());
    SG::ReadHandle< ActsTrk::TrackContainer > trackHandle = SG::makeHandle( m_inputTrackCollections, ctx );
    ATH_CHECK( trackHandle.isValid() );
    const ActsTrk::TrackContainer *tracks = trackHandle.cptr();
    ATH_MSG_DEBUG("   \\__ Number of retrieved tracks: " << tracks->size());
 
    const ActsTrk::PrepRawDataAssociation *inputPrdMap = nullptr;
    if (not m_inputPrdMap.empty()) {
      ATH_MSG_DEBUG("Retrieving Prd map from previous Acts Tracking Pass with key: " << m_inputPrdMap.key());
      SG::ReadHandle< ActsTrk::PrepRawDataAssociation > inputPrdMapHandle = SG::makeHandle( m_inputPrdMap, ctx );
      ATH_CHECK( inputPrdMapHandle.isValid() );
      inputPrdMap = inputPrdMapHandle.cptr();
      ATH_MSG_DEBUG("   \\__ Number of already used measurement from previous passes: " << inputPrdMap->size());
    }
    
    ATH_MSG_DEBUG("Creating new Prd Map for ACTS measurements with key: " << m_outputPrdMap.key());
    SG::WriteHandle< ActsTrk::PrepRawDataAssociation > outputPrdMapHandle = SG::makeHandle( m_outputPrdMap, ctx );
    if (inputPrdMap == nullptr) {
      ATH_CHECK( outputPrdMapHandle.record( std::make_unique< ActsTrk::PrepRawDataAssociation >() ) );
    } else {
      ATH_CHECK( outputPrdMapHandle.record( std::make_unique< ActsTrk::PrepRawDataAssociation >( *inputPrdMap ) ) );
    }
    ActsTrk::PrepRawDataAssociation *prdMap = outputPrdMapHandle.ptr();
 
    ATH_MSG_DEBUG("Filling map");
    enum class RecordStatus : int {UNKNOWN=0, SUCCESS, NOSOURCELINK, NULLSOURCELINK, ALREADYSTORED};   
    std::size_t nMeasurements = 0ul;
    RecordStatus status = RecordStatus::UNKNOWN;
    
    for (std::size_t i(0ul); i<tracks->size(); ++i) {
      tracks->trackStateContainer().visitBackwards(tracks->getTrack(i).tipIndex(),
                           [&prdMap, &nMeasurements, &status]
                           (const typename ActsTrk::TrackStateBackend::ConstTrackStateProxy state) -> bool
                           {
                             // only consider measurements
                             if (not state.typeFlags().test(Acts::TrackStateFlag::MeasurementFlag)) return true;
                             ++nMeasurements;
                             // Check it has link to uncalibrated cluster
                             if ( not state.hasUncalibratedSourceLink() ) {
                               status = RecordStatus::NOSOURCELINK;
                               return false;
                             }
                             // Get the uncalibrated measurement
                             const ActsTrk::ATLASUncalibSourceLink sl = state.getUncalibratedSourceLink().template get<ActsTrk::ATLASUncalibSourceLink>();
                             if (sl == nullptr) {
                               status = RecordStatus::NULLSOURCELINK;
                               return false;
                             }
                             const xAOD::UncalibratedMeasurement &uncalibMeas = ActsTrk::getUncalibratedMeasurement(sl);                             
                             // Store the identifier
                             const auto& [itr, inserted] = prdMap->markAsUsed(uncalibMeas.identifier());
                             if (not inserted) {
                               status = RecordStatus::ALREADYSTORED;
                               return true;
                             }
                             status = RecordStatus::SUCCESS;
                             return true;
                           });
      if (status == RecordStatus::SUCCESS) continue;
 
      switch(status) {
      case RecordStatus::NOSOURCELINK:
    { ATH_MSG_ERROR("There was a problem when storing the Prd collections");
      ATH_MSG_ERROR("Source link was not available."); }
    return StatusCode::FAILURE;
      case RecordStatus::NULLSOURCELINK:
    { ATH_MSG_ERROR("There was a problem when storing the Prd collections");
      ATH_MSG_ERROR("Source link was nullptr."); }
    return StatusCode::FAILURE;
      case RecordStatus::ALREADYSTORED:
    // do not stop execution, right now it is still possible at this stage two
    // tracks use the same measurement
    { ATH_MSG_WARNING("There was a problem when storing the Prd collections");
      ATH_MSG_WARNING("Measurement was already stored."); }
    break;
      default:
    { ATH_MSG_WARNING("There was a problem when storing the Prd collections");
      ATH_MSG_WARNING("No iteration on track states has been performed."); }
    break;
      }
    } // loop on tracks
 
    ATH_MSG_DEBUG("Number of used measurements: " << prdMap->size() << " from " << tracks->size() << " tracks");
    ATH_MSG_DEBUG("   \\__ Found a total of " << nMeasurements << " measurements");
    
    return StatusCode::SUCCESS;
  }
  
}