ICache.hpp

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#pragma once

#include "Status.hpp"

#include <set>
#include <algorithm>

namespace dcrud {

   class ClassID;
   class GUID;
   class Shareable;

   typedef bool ( * shareablePredicate_t)( const Shareable & shareable );

   typedef std::set<Shareable *>  shareables_t;
   typedef shareables_t::iterator shareablesIter_t;

   class ICache {
   public:

      virtual ~ ICache() {}

      virtual void setOwnership( bool enabled ) = 0;

      virtual bool owns( const GUID & id ) const = 0;

      virtual Status      create( Shareable & item )       = 0;
      virtual Shareable * read  ( const GUID & id  ) const = 0;
      virtual Status      update( Shareable & item )       = 0;
      virtual Status      deleTe( Shareable & item )       = 0;

      virtual void values( shareables_t & snapshot ) const = 0;
      virtual bool select( shareablePredicate_t query, shareables_t & snapshot ) const = 0;

      virtual void publish( void ) = 0;

      virtual void subscribe( const ClassID & id ) = 0;

      virtual void refresh( void ) = 0;

      template<class T>
      T * get( const GUID & id ) const {
         return dynamic_cast<T *>( read( id ));
      }
   };
}