GeneratorService.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#ifndef ALICEO2_GENERATORSERVICE_H_
#define ALICEO2_GENERATORSERVICE_H_
 
#include <utility> // for pair
#include <vector>
#include <SimulationDataFormat/MCEventHeader.h>
#include <SimulationDataFormat/MCTrack.h>
#include <Generators/PrimaryGenerator.h> // could be forward declaration
#include <DetectorsBase/Stack.h>
 
namespace o2
{
 
namespace dataformats
{
class MeanVertexObject;
}
 
namespace eventgen
{
 
struct VertexOption {
  virtual ~VertexOption() = default; /* this is making the class polymorphic */
};
 
// some specialized structs allow to pass different options
struct NoVertexOption : public VertexOption {
 
}; // this means to apply no Vertex
 
struct DiamondParamVertexOption : public VertexOption {
};
 
struct MeanVertexObjectOption : public VertexOption {
  // the mean vertex object
  o2::dataformats::MeanVertexObject* meanVertexObject = nullptr;
};
 
struct CollisionContextVertexOption : public VertexOption {
};
 
class GeneratorService
{
 
 public:
  void initService(std::string const& generatorName,
                   std::string const& triggerName,
                   VertexOption const& vtxOption);
 
  std::pair<std::vector<MCTrack>, o2::dataformats::MCEventHeader> generateEvent();
 
  void generateEvent_MCTracks(std::vector<MCTrack>& tracks, o2::dataformats::MCEventHeader& header);
  void generateEvent_TParticles(std::vector<TParticle>& tparts, o2::dataformats::MCEventHeader& header);
 
 private:
  PrimaryGenerator mPrimGen;
  o2::data::Stack mStack;
};
 
} // namespace eventgen
} // namespace o2
 
#endif