CandidatePtrTransientTrack.h

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#ifndef TrackingTools_TransientTrack_CandTransientTrack_h
#define TrackingTools_TransientTrack_CandTransientTrack_h
 
#include <atomic>
 
#include "TrackingTools/TransientTrack/interface/BasicTransientTrack.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "TrackingTools/PatternTools/interface/TSCPBuilderNoMaterial.h"
 
#include "DataFormats/Candidate/interface/Candidate.h"
namespace reco {
 
  class CandidatePtrTransientTrack : public Track, public BasicTransientTrack {
  public:
    // constructor from persistent track
    CandidatePtrTransientTrack();
 
    CandidatePtrTransientTrack(const CandidatePtr& tk, const MagneticField* field);
    CandidatePtrTransientTrack(const CandidatePtr& tk,
                               const double time,
                               const double dtime,
                               const MagneticField* field);
 
    CandidatePtrTransientTrack(const CandidatePtr& tk,
                               const MagneticField* field,
                               const edm::ESHandle<GlobalTrackingGeometry>& trackingGeometry);
    CandidatePtrTransientTrack(const CandidatePtr& tk,
                               const double time,
                               const double dtime,
                               const MagneticField* field,
                               const edm::ESHandle<GlobalTrackingGeometry>& trackingGeometry);
 
    CandidatePtrTransientTrack(const CandidatePtrTransientTrack& tt);
 
    CandidatePtrTransientTrack& operator=(const CandidatePtrTransientTrack& tt);
 
    void setTrackingGeometry(const edm::ESHandle<GlobalTrackingGeometry>&) override;
 
    void setBeamSpot(const reco::BeamSpot& beamSpot) override;
 
    FreeTrajectoryState initialFreeState() const override { return initialFTS; }
 
    TrajectoryStateOnSurface outermostMeasurementState() const override;
 
    TrajectoryStateOnSurface innermostMeasurementState() const override;
 
    TrajectoryStateClosestToPoint trajectoryStateClosestToPoint(const GlobalPoint& point) const override {
      return builder(initialFTS, point);
    }
 
    TrajectoryStateOnSurface stateOnSurface(const GlobalPoint& point) const override;
 
    TrajectoryStateClosestToPoint impactPointTSCP() const override;
 
    TrajectoryStateOnSurface impactPointState() const override;
 
    bool impactPointStateAvailable() const override { return (m_TSOS.load() == kSet ? true : false); }
 
    TrackRef persistentTrackRef() const { return TrackRef(); }
 
    TrackBaseRef trackBaseRef() const override { return TrackBaseRef(); }
 
    TrackCharge charge() const override { return Track::charge(); }
 
    CandidatePtr candidate() const override { return ptr_; }
 
    const MagneticField* field() const override { return theField; }
 
    const Track& track() const override { return *this; }
 
    TrajectoryStateClosestToBeamLine stateAtBeamLine() const override;
 
    double timeExt() const override { return (hasTime ? timeExt_ : std::numeric_limits<double>::quiet_NaN()); }
    double dtErrorExt() const override { return (hasTime ? dtErrorExt_ : std::numeric_limits<double>::quiet_NaN()); }
 
  private:
    CandidatePtr ptr_;
    bool hasTime;
    double timeExt_, dtErrorExt_;
    const MagneticField* theField;
 
    FreeTrajectoryState initialFTS;
 
    // mutable member data, those should be treated very carefully to guarantee
    // thread safeness of the code by using atomic thread-safe helpers, see below
    mutable TrajectoryStateOnSurface initialTSOS;
    mutable TrajectoryStateClosestToPoint initialTSCP;
    mutable TrajectoryStateClosestToBeamLine trajectoryStateClosestToBeamLine;
    // thread-safe helpers to guarantee proper update of mutable member data
    mutable std::atomic<char> m_TSOS;
    mutable std::atomic<char> m_TSCP;
    mutable std::atomic<char> m_SCTBL;
 
    TSCPBuilderNoMaterial builder;
    edm::ESHandle<GlobalTrackingGeometry> theTrackingGeometry;
    reco::BeamSpot theBeamSpot;
 
    // to be used to setup thread states of class mutables
    enum CacheStates { kUnset, kSetting, kSet };
  };
 
}  // namespace reco
 
#endif