SourceFactory.h

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#ifndef FWCore_Framework_SourceFactory_h
#define FWCore_Framework_SourceFactory_h
// -*- C++ -*-
//
// Package:     Framework
// Class  :     SourceFactory
//
//
// Author:      Chris Jones
// Created:     Wed May 25 18:01:38 EDT 2005
//

// system include files
#include <memory>
#include <string>

// user include files
#include "FWCore/Framework/interface/ComponentFactory.h"
#include "FWCore/Framework/interface/EventSetupProvider.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescriptionFillerPluginFactory.h"

// forward declarations

namespace edm {
  class EventSetupRecordIntervalFinder;
  class ParameterSet;

  namespace eventsetup {
    class DataProxyProvider;
    class EventSetupsController;

    template <class T>
    void addProviderTo(EventSetupProvider& iProvider, std::shared_ptr<T> iComponent, const DataProxyProvider*) {
      std::shared_ptr<DataProxyProvider> pProvider(iComponent);
      ComponentDescription description = pProvider->description();
      description.isSource_ = true;
      pProvider->setDescription(description);
      iProvider.add(pProvider);
    }
    template <class T>
    void addProviderTo(EventSetupProvider& /* iProvider */, std::shared_ptr<T> /*iComponent*/, const void*) {
      //do nothing
    }

    struct SourceMakerTraits {
      typedef EventSetupRecordIntervalFinder base_type;
      static std::string name();
      template <class T>
      static void addTo(EventSetupProvider& iProvider,
                        std::shared_ptr<T> iComponent,
                        ParameterSet const& iConfiguration,
                        bool matchesPreceding) {
        if (matchesPreceding) {
          logInfoWhenSharing(iConfiguration);
        }
        //a source does not always have to be a provider
        addProviderTo(iProvider, iComponent, static_cast<const T*>(nullptr));
        std::shared_ptr<EventSetupRecordIntervalFinder> pFinder(iComponent);
        iProvider.add(pFinder);
      }
      static void replaceExisting(EventSetupProvider& iProvider,
                                  std::shared_ptr<EventSetupRecordIntervalFinder> iComponent);

      static std::shared_ptr<base_type> getComponentAndRegisterProcess(EventSetupsController& esController,
                                                                       ParameterSet const& iConfiguration);

      static void putComponent(EventSetupsController& esController,
                               ParameterSet const& iConfiguration,
                               std::shared_ptr<base_type> const& component);

      static void logInfoWhenSharing(ParameterSet const& iConfiguration);
    };

    template <class TType>
    struct SourceMaker : public ComponentMaker<edm::eventsetup::SourceMakerTraits, TType> {};
    typedef ComponentFactory<SourceMakerTraits> SourceFactory;

    typedef edmplugin::PluginFactory<edm::eventsetup::ComponentMakerBase<edm::eventsetup::SourceMakerTraits>*()>
        SourcePluginFactory;
  }  // namespace eventsetup
}  // namespace edm

#define DEFINE_FWK_EVENTSETUP_SOURCE(type)                                                            \
  DEFINE_EDM_PLUGIN(edm::eventsetup::SourcePluginFactory, edm::eventsetup::SourceMaker<type>, #type); \
  DEFINE_DESC_FILLER_FOR_ESSOURCES(type)

#endif