/data/refman/pasoursint/CMSSW_5_2_9/src/FWCore/Framework/src/SignallingProductRegistry.cc

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// -*- C++ -*-
//
// Package:     Framework
// Class  :     SignallingProductRegistry
//
// Implementation:
//     <Notes on implementation>
//
// Original Author:  Chris Jones
//         Created:  Fri Sep 23 16:52:50 CEST 2005
//

// system include files

// user include files
#include "FWCore/Framework/src/SignallingProductRegistry.h"
#include "FWCore/Utilities/interface/Exception.h"

using namespace edm;
//
// member functions
//
namespace {
   struct StackGuard {
      StackGuard(std::string const& iTypeName, std::map<std::string, unsigned int>& ioStack, bool iFromListener) :
          numType_(++ioStack[iTypeName]), itr_(ioStack.find(iTypeName)), fromListener_(iFromListener) {
        if(iFromListener) {++(itr_->second);}
      }

      ~StackGuard() {
         --(itr_->second);
         if(fromListener_) {
            --(itr_->second);
         }
      }

      unsigned int numType_;
      std::map<std::string, unsigned int>::iterator itr_;
      bool fromListener_;
   };
}

void SignallingProductRegistry::addCalled(BranchDescription const& iProd, bool iFromListener) {
   StackGuard guard(iProd.className(), typeAddedStack_, iFromListener);
   if(guard.numType_ > 2) {
     throw cms::Exception("CircularReference")
       << "Attempted to register the production of "
       << iProd.className()
       << " from module "
       << iProd.moduleLabel()
       << " with product instance \""
       << iProd.productInstanceName()
       << "\"\n"
       << "However, this was in reaction to a registration of a production for the same type \n"
       << "from another module who was also listening to product registrations.\n"
       << "This can lead to circular Event::get* calls.\n"
       << "Please reconfigure job so it does not contain both of the modules.";
   }
   productAddedSignal_(iProd);
}