PythonManager.h

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//
// Smart reference + singleton to handle Python interpreter
//
//
// Original Author:  Chris D Jones & Benedikt Hegner
//         Created:  Sun Jul 22 11:03:53 CEST 2006
//

#ifndef FWCore_Python_PythonManager_h
#define FWCore_Python_PythonManager_h

#include "FWCore/PythonParameterSet/interface/BoostPython.h"

extern "C" {
   //this is the entry point into the libFWCorePython python module
   void initlibFWCorePython();
   //void initROOT();
}

void pythonToCppException(const std::string& iType);

    class PythonManagerHandle;
    
    class PythonManager {
      public:
        friend class PythonManagerHandle;
        static PythonManagerHandle handle();

      private:
         PythonManager();
         ~PythonManager() { Py_Finalize(); }
         void increment() { ++refCount_; }
         void decrement() { --refCount_; if(0==refCount_) delete this; }
         unsigned long refCount_;
         std::string initCommand_;
    };

    class PythonManagerHandle {
      public:
        ~PythonManagerHandle() { manager_.decrement(); }

        PythonManagerHandle(PythonManager& iM):
          manager_(iM) {
          manager_.increment();
        }

        PythonManagerHandle(const PythonManagerHandle& iRHS) :
          manager_(iRHS.manager_) {
          manager_.increment();
        }
        
      private:
        const PythonManagerHandle& operator=(const PythonManagerHandle&);
        PythonManager& manager_;
    };
#endif // FWCore_Python_PythonManager_h