ServiceDirector.h

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#ifndef art_Framework_EventProcessor_ServiceDirector_h
#define art_Framework_EventProcessor_ServiceDirector_h
#include "art/Framework/Services/Registry/ActivityRegistry.h"
#include "art/Framework/Services/Registry/ServiceToken.h"
#include "art/Utilities/bold_fontify.h"
#include "canvas/Utilities/Exception.h"
#include "cetlib/HorizontalRule.h"
#include "cetlib_except/demangle.h"
#include "fhiclcpp/ParameterSet.h"
#include "fhiclcpp/types/detail/validationException.h"

#include <memory>

namespace art {
  class ServiceDirector;
}

class art::ServiceDirector {
public:
  explicit ServiceDirector(fhicl::ParameterSet&& services,
                           ActivityRegistry& areg,
                           ServiceToken& token);

  template <typename SERVICE, typename... ARGS>
  void addSystemService(ARGS&&... args);

private:
  ServiceToken& serviceToken_;
};

template <typename SERVICE, typename... ARGS>
void
art::ServiceDirector::addSystemService(ARGS&&... args) try {
  serviceToken_.add(std::make_unique<SERVICE>(std::forward<ARGS>(args)...));
}
catch (fhicl::detail::validationException const& e) {
  constexpr cet::HorizontalRule rule{100};
  throw art::Exception(art::errors::Configuration)
    << "\n"
    << rule('=') << "\n\n"
    << "!! The following service has been misconfigured: !!"
    << "\n\n"
    << rule('-') << "\n\nservice_type: "
    << art::detail::bold_fontify(cet::demangle_symbol(typeid(SERVICE).name()))
    << "\n\n"
    << e.what() << "\n"
    << rule('=') << "\n\n";
}

#endif /* art_Framework_EventProcessor_ServiceDirector_h */

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