iPatFitter.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRKIPATFITTER_IPATFITTER_H
#define TRKIPATFITTER_IPATFITTER_H
 
#include <memory>
#include <mutex>
#include <vector>
 
#include "AthenaBaseComps/AthAlgTool.h"
#include "GaudiKernel/EventContext.h"
#include "GaudiKernel/ToolHandle.h"
#include "TrkDetDescrInterfaces/ITrackingVolumesSvc.h"
#include "TrkExInterfaces/IIntersector.h"
#include "TrkExInterfaces/IPropagator.h"
#include "TrkFitterInterfaces/ITrackFitter.h"
#include "TrkGeometry/MagneticFieldProperties.h"
#include "TrkGeometry/TrackingVolume.h"
#include "TrkParameters/TrackParameters.h"
#include "TrkToolInterfaces/IExtendedTrackSummaryTool.h"
#include "TrkTrack/Track.h"
#include "TrkTrack/TrackInfo.h"
#include "TrkTrackSummary/MuonTrackSummary.h"
#include "TrkiPatFitterUtils/FitMeasurement.h"
#include "TrkiPatFitterUtils/FitParameters.h"
#include "TrkiPatFitterUtils/FitProcedure.h"
#include "TrkiPatFitterUtils/IMaterialAllocator.h"
#include "TrkiPatFitterUtils/MessageHelper.h"
namespace Trk {
class FitQuality;
class TrackStateOnSurface;
class iPatFitter : public AthAlgTool, virtual public ITrackFitter {
 public:
  typedef IMaterialAllocator::Garbage_t Garbage_t;
 
  // standard AlgTool methods
  iPatFitter(const std::string& type, const std::string& name,
             const IInterface* parent, bool isGlobalFit = false);
  virtual ~iPatFitter() = default;
 
  // standard Athena methods
  virtual StatusCode initialize() override;
  virtual StatusCode finalize() override;
 
  // iPat Fitter settings (FIXME: to provide??):
  //    RunOutlierRemoval    - use logic to remove bad hits
 
  // refit a track
  virtual std::unique_ptr<Track> fit(
      const EventContext& ctx, const Track&,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis =
          Trk::nonInteracting) const override;
 
  // refit a track adding a PrepRawDataSet
  virtual std::unique_ptr<Track> fit(
      const EventContext& ctx, const Track&, const PrepRawDataSet&,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis =
          Trk::nonInteracting) const override;
 
  // fit a set of PrepRawData objects
  virtual std::unique_ptr<Track> fit(
      const EventContext& ctx, const PrepRawDataSet&,
      const TrackParameters& perigeeStartValue,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis =
          Trk::nonInteracting) const override;
 
  // refit a track adding a MeasurementSet
  virtual std::unique_ptr<Track> fit(
      const EventContext& ctx, const Track&, const MeasurementSet&,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis =
          Trk::nonInteracting) const override;
 
  // fit a set of MeasurementBase objects with starting value for
  // perigeeParameters
  virtual std::unique_ptr<Track> fit(
      const EventContext& ctx, const MeasurementSet&,
      const TrackParameters& perigeeStartValue,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis =
          Trk::nonInteracting) const override;
 
  // combined muon fit
  virtual std::unique_ptr<Track> fit(
      const EventContext& ctx, const Track&, const Track&,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis =
          Trk::nonInteracting) const override;
 
 protected:
  class FitState {
   public:
    ~FitState() { deleteMeasurements(); }
 
    void deleteMeasurements() {
      if (m_measurements) {
        for (auto m : *m_measurements) {
          delete m;
        }
      }
    }
 
    void newMeasurements() {
      deleteMeasurements();
      m_measurements = std::make_unique<std::vector<FitMeasurement*>>();
    }
 
    std::vector<FitMeasurement*>& getMeasurements() {
      if (m_measurements) {
        return *m_measurements;
      } else {
        throw std::runtime_error("no measurements exist");
      }
    }
 
    const std::vector<FitMeasurement*>& getMeasurements() const {
      if (m_measurements) {
        return *m_measurements;
      } else {
        throw std::runtime_error("no measurements exist");
      }
    }
 
    bool hasMeasurements() const { return m_measurements.get() != nullptr; }
 
    std::unique_ptr<FitParameters> parameters = nullptr;
    int iterations = 0;
 
   private:
    std::unique_ptr<std::vector<FitMeasurement*>> m_measurements = nullptr;
  };
 
  // fitWithState that creates and returns state
  std::pair<std::unique_ptr<Track>, std::unique_ptr<FitState>> fitWithState(
      const EventContext& ctx, const Track&,
      const RunOutlierRemoval runOutlier = false,
      const ParticleHypothesis particleHypothesis = Trk::nonInteracting) const;
 
  // class implementing the algorithmic code for fitting
  std::unique_ptr<FitProcedure> m_fitProcedure;
  mutable std::mutex m_fitProcedureMutex;
 
  // flag to indicate global fitter, only used for logging
  const bool m_globalFit = false;
 
 private:
  // add MeasurementSet
  void addMeasurements(const EventContext& ctx,
                       std::vector<FitMeasurement*>& measurements,
                       const MeasurementSet& measurementSet,
                       const FitParameters& parameters) const;
 
  // add TrackStateOnSurfaces (true means material already allocated on
  // trackTSOS)
  bool addMeasurements(
      const EventContext& ctx, std::vector<FitMeasurement*>& measurements,
      const FitParameters& parameters, ParticleHypothesis particleHypothesis,
      const Trk::TrackStates& trackTSOS) const;
 
  // perform fit
  std::unique_ptr<Track> performFit(
      const EventContext& ctx,
      FitState& fitState, const ParticleHypothesis particleHypothesis,
      const TrackInfo& trackInfo,
      const Trk::TrackStates* leadingTSOS,
      const FitQuality* perigeeQuality, Garbage_t& garbage) const;
 
  // print TSOS on a track (debugging aid)
  void printTSOS(const Track&) const;
 
  void refit(const EventContext& ctx, FitState& fitState, const Track& track,
             const RunOutlierRemoval runOutlier,
             const ParticleHypothesis particleHypothesis) const;
 
  // configurables (tools and options)
  Gaudi::Property<bool> m_aggregateMaterial{this, "AggregateMaterial", true};
  Gaudi::Property<bool> m_asymmetricCaloEnergy{this, "AsymmetricCaloEnergy",
                                               true};
  Gaudi::Property<bool> m_fullCombinedFit{this, "FullCombinedFit", true};
  Gaudi::Property<bool> m_lineFit{this, "LineFit", false};
  Gaudi::Property<double> m_lineMomentum{this, "LineMomentum",
                                         100. * Gaudi::Units::GeV};
 
  ToolHandle<IMaterialAllocator> m_materialAllocator{
      this, "MaterialAllocator", "Trk::MaterialAllocator/MaterialAllocator"};
  ToolHandle<IIntersector> m_rungeKuttaIntersector{
      this, "RungeKuttaIntersector",
      "Trk::RungeKuttaIntersector/RungeKuttaIntersector"};
  ToolHandle<IIntersector> m_solenoidalIntersector{
      this, "SolenoidalIntersector",
      "Trk::SolenoidalIntersector/SolenoidalIntersector"};
  ToolHandle<IPropagator> m_stepPropagator{
      this, "Propagator", "Trk::STEP_Propagator/AtlasSTEP_Propagator"};
  ToolHandle<IIntersector> m_straightLineIntersector{
      this, "StraightLineIntersector",
      "Trk::StraightLineIntersector/StraightLineIntersector"};
  ServiceHandle<ITrackingVolumesSvc> m_trackingVolumesSvc{
      this, "TrackingVolumesSvc", "Trk::TrackingVolumesSvc/TrackingVolumesSvc"};
  ToolHandle<Trk::IExtendedTrackSummaryTool> m_trackSummaryTool{
      this, "TrackSummaryTool", "MuonTrackSummaryTool"};
 
  // configurable tolerances, warnings
  Gaudi::Property<double> m_orderingTolerance{this, "OrderingTolerance",
                                              1. * Gaudi::Units::mm};
  Gaudi::Property<unsigned> m_maxWarnings{
      this, "MaxNumberOfWarnings", 10,
      "Maximum number of permitted WARNING messages per message type."};
 
  // configurables for validation purposes
  Gaudi::Property<bool> m_constrainedAlignmentEffects{
      this, "ConstrainedAlignmentEffects", false};
  Gaudi::Property<bool> m_extendedDebug{this, "ExtendedDebug", false};
  Gaudi::Property<int> m_forcedRefitsForValidation{
      this, "ForcedRefitsForValidation", 0};
  Gaudi::Property<int> m_maxIterations{this, "MaxIterations", 25};
 
  // constants
  std::unique_ptr<Trk::Volume> m_calorimeterVolume;
  std::unique_ptr<Trk::Volume> m_indetVolume;
  Trk::MagneticFieldProperties m_stepField;
 
  // counters
  mutable std::atomic<unsigned> m_countFitAttempts = 0;
  mutable std::atomic<unsigned> m_countGoodFits = 0;
  mutable std::atomic<unsigned> m_countIterations = 0;
  mutable std::atomic<unsigned> m_countRefitAttempts = 0;
  mutable std::atomic<unsigned> m_countGoodRefits = 0;
  mutable std::atomic<unsigned> m_countRefitIterations = 0;
 
  // count warnings
  std::unique_ptr<MessageHelper> m_messageHelper;
};
 
}  // end of namespace Trk
 
#endif  // TRKIPATFITTER_IPATFITTER_H