FPGATrackSimPrototrackFitterAlg.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "FPGATrackSimPrototrackFitterAlg.h"
 
#include "ActsCalibBase/CalibrationContext.h"
 
constexpr bool enableBenchmark = 
#ifdef BENCHMARK_FPGATRACKSIM
    true;
#else
    false;
#endif
 
StatusCode FPGATrackSim::FPGATrackSimPrototrackFitterAlg::initialize() {
  ATH_CHECK(m_trackContainerKey.initialize());
  ATH_CHECK(m_tracksBackendHandlesHelper.initialize(ActsTrk::prefixFromTrackContainerName(m_trackContainerKey.key())));
  ATH_CHECK(m_actsFitter.retrieve()); 
  ATH_CHECK(m_trackingGeometryTool.retrieve());
  ATH_CHECK(m_extrapolationTool.retrieve());
  ATH_CHECK(m_ProtoTrackCollectionFromFPGAKey.initialize());
  ATH_CHECK(m_chrono.retrieve());
  return StatusCode::SUCCESS;
}
 
StatusCode FPGATrackSim::FPGATrackSimPrototrackFitterAlg::execute(const EventContext & ctx) const
{
  
  SG::WriteHandle<ActsTrk::TrackContainer> trackContainerHandle (m_trackContainerKey, ctx);
  SG::ReadHandle<ActsTrk::ProtoTrackCollection> myProtoTracks(m_ProtoTrackCollectionFromFPGAKey,ctx);
  
  if (!myProtoTracks.isValid()){
    ATH_MSG_WARNING("no Prototrack collections"); 
    return StatusCode::SUCCESS;
  }
  ATH_MSG_DEBUG("I received " <<myProtoTracks->size()<<" proto-tracks");
 

  const Acts::GeometryContext tgContext = m_trackingGeometryTool->getGeometryContext(ctx).context();
  const Acts::MagneticFieldContext mfContext = m_extrapolationTool->getMagneticFieldContext(ctx);
  const Acts::CalibrationContext calContext{ActsTrk::getCalibrationContext(ctx)};

  Acts::VectorTrackContainer trackBackend;
  Acts::VectorMultiTrajectory trackStateBackend;
  ActsTrk::MutableTrackContainer trackContainer( std::move(trackBackend),
                                                 std::move(trackStateBackend) );
  
  if constexpr (enableBenchmark) m_chrono->chronoStart("FPGATrackSimPrototrackFitterAlg: ACTS KF");
  // now we fit each of the proto tracks
  for (auto & proto : *myProtoTracks){
    auto res = m_actsFitter->fit(proto.measurements, *proto.parameters,
                                 tgContext, mfContext, calContext);
 
    if(!res) continue;
    if (res->size() == 0 ) continue;
    if(proto.measurements.empty()) continue;
    ATH_MSG_DEBUG(".......Done track with size "<< proto.measurements.size());
    const auto trackProxy = res->getTrack(0);
    if (not trackProxy.hasReferenceSurface()) {
      ATH_MSG_INFO("There is not reference surface for this track");
      continue;
    }
    auto destProxy = trackContainer.getTrack(trackContainer.addTrack());
    destProxy.copyFrom(trackProxy);
  }
  if constexpr (enableBenchmark) m_chrono->chronoStop("FPGATrackSimPrototrackFitterAlg: ACTS KF");
 
  // convert to const
  Acts::ConstVectorTrackContainer ctrackBackend( std::move(trackContainer.container()) );
  Acts::ConstVectorMultiTrajectory ctrackStateBackend( std::move(trackContainer.trackStateContainer()) );
  std::unique_ptr<ActsTrk::TrackContainer> constTracksContainer = std::make_unique<ActsTrk::TrackContainer>( std::move(ctrackBackend),
                                                                                                             std::move(ctrackStateBackend) );
 
  ATH_CHECK(trackContainerHandle.record(std::move(constTracksContainer)));
 
  return StatusCode::SUCCESS;
}