CbmKfOriginalField.h

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/* Copyright (C) 2024 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Sergey Gorbunov[committer] */
 
 
#pragma once  // include this header only once per compilation unit
 
#include "FairField.h"
#include "FairRunAna.h"
 
#include <mutex>
#include <tuple>
 
namespace cbm::kf
{
  class OriginalField {
   public:
    std::tuple<double, double, double> operator()(double x, double y, double z) const
    {
      assert(FairRunAna::Instance());
      assert(FairRunAna::Instance()->GetField());
      double pos[3] = {x, y, z};
      double B[3]   = {0., 0., 0.};
      // protect the field access
      // TODO: make CbmField thread-safe
      static std::mutex mymutex;
      mymutex.lock();
      FairRunAna::Instance()->GetField()->GetFieldValue(pos, B);
      mymutex.unlock();
      return std::tuple(B[0], B[1], B[2]);
    }
  };
 
  class ZeroField {
   public:
    std::tuple<double, double, double> operator()(double, double, double) const { return std::tuple(0., 0., 0.); }
  };
}  // namespace cbm::kf