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File indexing completed on 2021-02-14 14:29:50

0001 #ifndef SimG4Core_Notification_Observer_H
0002 #define SimG4Core_Notification_Observer_H
0003 // -*- C++ -*-
0004 //
0005 // Package:     Notification
0006 // Class  :     Observer
0007 //
0008 /**\class Observer Observer.h SimG4Core/Notification/interface/Observer.h
0009 
0010 Description: Adapts the COBRA signal handling for use in the OscarProducer
0011 
0012 Usage:
0013 If a class that is loaded by OscarProducer, via its configuraiton file, inherits from Observer<T>,
0014 (e.g., Observer<const BeginOfTrack*>), the OscarProducer will make sure the appropriate signal
0015 is sent to an object of that class (e.g., the object will see the BeginOfTrack signal).  To handle
0016 the signal the class must override the 'void update(T)' method (e.g., void update(const BeginOfTrack*)).
0017 
0018 */
0019 //
0020 //
0021 
0022 template <class T>
0023 class Observer {
0024 public:
0025   Observer() {}
0026   virtual ~Observer() {}
0027 
0028   /** This method is what is called when the signal is actually sent.  The signal is not sent
0029        directly to 'update' because if we did
0030        1) If the user did not declare 'update' to be 'public' then we get a compilation failure 
0031        2) we would not have a 'hook' to allow the 'pre' and 'post' functions to be called
0032        */
0033   void slotForUpdate(T iT) { update(iT); }
0034 
0035 protected:
0036   ///This routine will be called when the appropriate signal arrives
0037   virtual void update(T) = 0;
0038 
0039 private:
0040 };
0041 
0042 #endif