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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
// $Id: ServiceRegistry.h,v 1.11 2007/10/27 21:46:43 chrjones Exp $
//

// system include files

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

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

   public:
      
      class Operate {
        public:
         Operate(const ServiceToken& iToken) : 
         oldToken_(ServiceRegistry::instance().setContext(iToken))
         {}
         ~Operate() {
            ServiceRegistry::instance().unsetContext(oldToken_);
         }
         
         //override operator new to stop use on heap?
        private:
         Operate(const Operate&); //stop default
         const Operate& operator=(const Operate&); //stop default
         ServiceToken oldToken_;
      };
      
      friend class edm::FwkImpl;
      friend int main(int argc, char* argv[]);
      friend class Operate;

      virtual ~ServiceRegistry();

      // ---------- const member functions ---------------------
      template<class T>
         T& get() const {
            if(0 == manager_.get()) {
               throw edm::Exception(edm::errors::NotFound,"Service")
               <<" no ServiceRegistry has been set for this thread";
            }
            return manager_-> template get<T>();
         }
      
      template<class T>
         bool isAvailable() const {
            if(0 == manager_.get()) {
               throw edm::Exception(edm::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(const std::string& config);

   public: // Made public (temporarily) at the request of Emilio Meschi.
      static ServiceToken createSet(const std::vector<ParameterSet>&);
      static ServiceToken createSet(const std::vector<ParameterSet>&,
                                    ServiceToken,
                                    serviceregistry::ServiceLegacy);
      template<class T>
         static ServiceToken createContaining(std::auto_ptr<T> iService){
            std::vector<edm::ParameterSet> config;
            boost::shared_ptr<serviceregistry::ServicesManager> manager( new serviceregistry::ServicesManager(config) );
            boost::shared_ptr<serviceregistry::ServiceWrapper<T> >
               wrapper(new serviceregistry::ServiceWrapper<T>(iService));
            manager->put(wrapper);
            return manager;
         }
      template<class T>
         static ServiceToken createContaining(std::auto_ptr<T> iService,
                                              ServiceToken iToken,
                                              serviceregistry::ServiceLegacy iLegacy){
            std::vector<edm::ParameterSet> config;
            boost::shared_ptr<serviceregistry::ServicesManager> manager( new serviceregistry::ServicesManager(iToken,
                                                                                                              iLegacy,
                                                                                                              config) );
            boost::shared_ptr<serviceregistry::ServiceWrapper<T> >
            wrapper(new serviceregistry::ServiceWrapper<T>(iService));
            manager->put(wrapper);
            return manager;
         }
      template<class T>
         static ServiceToken createContaining(boost::shared_ptr<serviceregistry::ServiceWrapper<T> > iWrapper) {
            std::vector<edm::ParameterSet> config;
            boost::shared_ptr<serviceregistry::ServicesManager> manager( new serviceregistry::ServicesManager(config) );
            manager->put(iWrapper);
            return manager;
         }
      template<class T>
         static ServiceToken createContaining(boost::shared_ptr<serviceregistry::ServiceWrapper<T> > iWrapper,
                                              ServiceToken iToken,
                                              serviceregistry::ServiceLegacy iLegacy){
            std::vector<edm::ParameterSet> config;
            boost::shared_ptr<serviceregistry::ServicesManager> manager( new serviceregistry::ServicesManager(iToken,
                                                                                                              iLegacy,
                                                                                                              config) );
            manager->put(iWrapper);
            return manager;
         }
      
private:
      
      //returns old token
      ServiceToken setContext(const ServiceToken& iNewToken);
      void unsetContext(const ServiceToken& iOldToken);
      
      ServiceRegistry();
      ServiceRegistry(const ServiceRegistry&); // stop default

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

      // ---------- member data --------------------------------
      boost::shared_ptr<serviceregistry::ServicesManager> manager_;
   };
}

#endif

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