ServiceRegistry.h

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#ifndef ServiceRegistry_ServiceRegistry_h
#define ServiceRegistry_ServiceRegistry_h
// -*- C++ -*-
//
// Package:     ServiceRegistry
// Class  :     ServiceRegistry
//
//
// Original Author:  Chris Jones
//         Created:  Mon Sep  5 13:33:00 EDT 2005
//

// user include files
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ServiceRegistry/interface/ServiceLegacy.h"
#include "FWCore/ServiceRegistry/interface/ServiceToken.h"
#include "FWCore/ServiceRegistry/interface/ServicesManager.h"

// system include files
#include <vector>

// forward declarations
namespace edm {
  class FwkImpl;
  namespace serviceregistry {
    template <typename T>
    class ServiceWrapper;
  }

  class ServiceRegistry {
  public:
    class Operate {
    public:
      Operate(ServiceToken const& iToken) : oldToken_(ServiceRegistry::instance().setContext(iToken)) {}
      ~Operate() { ServiceRegistry::instance().unsetContext(oldToken_); }

      //override operator new to stop use on heap?
    private:
      Operate(Operate const&) = delete;                   //stop default
      Operate const& operator=(Operate const&) = delete;  //stop default
      ServiceToken oldToken_;
    };

    friend class edm::FwkImpl;
    friend int main(int argc, char* argv[]);
    friend class Operate;

    virtual ~ServiceRegistry();

    // ---------- const member functions ---------------------
    template <typename T>
    T& get() const {
      if (nullptr == manager_.get()) {
        Exception::throwThis(errors::NotFound,
                             "Service"
                             " no ServiceRegistry has been set for this thread");
      }
      return manager_->template get<T>();
    }

    template <typename T>
    bool isAvailable() const {
      if (nullptr == manager_.get()) {
        Exception::throwThis(errors::NotFound,
                             "Service"
                             " no ServiceRegistry has been set for this thread");
      }
      return manager_->template isAvailable<T>();
    }
    ServiceToken presentToken() const;
    // ---------- static member functions --------------------
    static ServiceRegistry& instance();

    // ---------- member functions ---------------------------

    static ServiceToken createServicesFromConfig(std::unique_ptr<ParameterSet> params);

  public:  // Made public (temporarily) at the request of Emilio Meschi.
    static ServiceToken createSet(std::vector<ParameterSet>&);
    static ServiceToken createSet(std::vector<ParameterSet>&,
                                  ServiceToken,
                                  serviceregistry::ServiceLegacy,
                                  bool associate = true);
    template <typename T>
    static ServiceToken createContaining(std::unique_ptr<T> iService) {
      std::vector<edm::ParameterSet> config;
      auto manager = std::make_shared<serviceregistry::ServicesManager>(config);
      auto wrapper = std::make_shared<serviceregistry::ServiceWrapper<T> >(std::move(iService));
      manager->put(wrapper);
      return manager;
    }
    template <typename T>
    static ServiceToken createContaining(std::unique_ptr<T> iService,
                                         ServiceToken iToken,
                                         serviceregistry::ServiceLegacy iLegacy) {
      std::vector<edm::ParameterSet> config;
      auto manager = std::make_shared<serviceregistry::ServicesManager>(iToken, iLegacy, config);
      auto wrapper = std::make_shared<serviceregistry::ServiceWrapper<T> >(std::move(iService));
      manager->put(wrapper);
      return manager;
    }
    template <typename T>
    static ServiceToken createContaining(std::shared_ptr<serviceregistry::ServiceWrapper<T> > iWrapper) {
      std::vector<edm::ParameterSet> config;
      auto manager = std::make_shared<serviceregistry::ServicesManager>(config);
      manager->put(iWrapper);
      return manager;
    }
    template <typename T>
    static ServiceToken createContaining(std::shared_ptr<serviceregistry::ServiceWrapper<T> > iWrapper,
                                         ServiceToken iToken,
                                         serviceregistry::ServiceLegacy iLegacy) {
      std::vector<edm::ParameterSet> config;
      auto manager = std::make_shared<serviceregistry::ServicesManager>(iToken, iLegacy, config);
      manager->put(iWrapper);
      return manager;
    }

  private:
    //returns old token
    ServiceToken setContext(ServiceToken const& iNewToken);
    void unsetContext(ServiceToken const& iOldToken);

    ServiceRegistry();
    ServiceRegistry(ServiceRegistry const&) = delete;  // stop default

    ServiceRegistry const& operator=(ServiceRegistry const&) = delete;  // stop default

    // ---------- member data --------------------------------
    std::shared_ptr<serviceregistry::ServicesManager> manager_;
  };
}  // namespace edm

#endif