ProducerBase.cc

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#include "FWCore/Framework/interface/ProducerBase.h"
#include "DataFormats/Provenance/interface/ModuleDescription.h"
#include "DataFormats/Provenance/interface/ProductRegistry.h"

#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Framework/interface/ConstProductRegistry.h"

#include <sstream>

namespace edm {
  ProducerBase::ProducerBase() : ProductRegistryHelper(), callWhenNewProductsRegistered_() {}
  ProducerBase::~ProducerBase() { }

   std::function<void(BranchDescription const&)> ProducerBase::registrationCallback() const {
      return callWhenNewProductsRegistered_;
   }


   namespace {
     class CallbackWrapper {
       public:  
        CallbackWrapper(ProducerBase* iProd,
                        std::function<void(BranchDescription const&)> iCallback,
                        ProductRegistry* iReg,
                        const ModuleDescription& iDesc):
        prod_(iProd), callback_(iCallback), reg_(iReg), mdesc_(iDesc),
        lastSize_(iProd->typeLabelList().size()) {}
        
        void operator()(BranchDescription const& iDesc) {
           callback_(iDesc);
           addToRegistry();
        }
        
        void addToRegistry() {
           ProducerBase::TypeLabelList const& plist = prod_->typeLabelList();
           
           if(lastSize_!=plist.size()){
              ProducerBase::TypeLabelList::const_iterator pStart = plist.begin();
              advance(pStart, lastSize_);
              ProductRegistryHelper::addToRegistry(pStart, plist.end() ,mdesc_, *reg_);
              lastSize_ = plist.size();
           }
        }

      private:
        ProducerBase* prod_;
        std::function<void(BranchDescription const&)> callback_;
        ProductRegistry* reg_;
        ModuleDescription mdesc_;
        unsigned int lastSize_;
         
     };
  }


  void ProducerBase::registerProducts(ProducerBase* producer,
                ProductRegistry* iReg,
                ModuleDescription const& md)
  {
    if (typeLabelList().empty() && !registrationCallback()) {
      return;
    }
    //If we have a callback, first tell the callback about all the entries already in the
    // product registry, then add any items this producer wants to add to the registry 
    // and only after that do we register the callback. This is done so the callback does not
    // get called for items registered by this producer (avoids circular reference problems)
    bool isListener = false;
    if(registrationCallback()) {
       isListener=true;
       iReg->callForEachBranch(registrationCallback());
    }
    TypeLabelList const& plist = typeLabelList();

    ProductRegistryHelper::addToRegistry(plist.begin(), plist.end(), md, *(iReg), isListener);
    if(registrationCallback()) {
       Service<ConstProductRegistry> regService;
       regService->watchProductAdditions(CallbackWrapper(producer, registrationCallback(), iReg, md));
    }
  }
}