DD4hep_service.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) 2022, 2023 Whitney Armstrong, Wouter Deconinck, David Lawrence
//
 
#pragma once
 
#include <DD4hep/Detector.h>
#include <DDRec/CellIDPositionConverter.h>
#include <JANA/JApplicationFwd.h>
#include <JANA/JServiceFwd.h>
#include <spdlog/logger.h>
#include <gsl/pointers>
#include <memory>
#include <mutex>
#include <string>
#include <vector>
 
class DD4hep_service : public JService {
public:
  DD4hep_service(JApplication* app) : m_app(app) {}
  virtual ~DD4hep_service();
 
  virtual gsl::not_null<const dd4hep::Detector*> detector();
  virtual gsl::not_null<const dd4hep::rec::CellIDPositionConverter*> converter();
 
protected:
  void Initialize();
 
private:
  DD4hep_service() = default;
  void acquire_services(JServiceLocator*) override;
 
  std::once_flag init_flag;
  JApplication* m_app                                                            = nullptr;
  std::unique_ptr<const dd4hep::Detector> m_dd4hepGeo                            = nullptr;
  std::unique_ptr<const dd4hep::rec::CellIDPositionConverter> m_cellid_converter = nullptr;
  std::vector<std::string> m_xml_files;
 
  static std::string resolveFileName(const std::string& filename, char* detector_path_env);
 
  std::shared_ptr<spdlog::logger> m_log;
};