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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.
/// \author S. Wenzel - September 2023
#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
{
/// Helper class
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 {
};
/// @brief A class offering convenient generator configuration and encapsulation of lower level classes.
/// Meant to reduce code duplication for places where events need to be generated.
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