File : aws-dispatchers.ads


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--  $Id: aws-dispatchers.ads,v 1.1 2003/10/05 19:59:54 Jano Exp $


--  This package provides a service to build Callbacks which can support

--  user's data. It is possible to build a new dispatcher by inheriting the

--  handler type and to provides the Dispatch routine.


with Ada.Finalization;

with AWS.Response;
with AWS.Status;

package AWS.Dispatchers is

   type Handler is abstract new Ada.Finalization.Controlled with private;

   procedure Initialize (Dispatcher : in out Handler);
   procedure Adjust     (Dispatcher : in out Handler);
   procedure Finalize   (Dispatcher : in out Handler);
   --  Initialize/Adjust/Finalize is doing the reference counting, children

   --  should just call these routines if possible. It is possible to know if

   --  no more object are referenced by calling Ref_Counter below.


   function Dispatch
     (Dispatcher : in Handler;
      Request    : in Status.Data)
     return Response.Data is abstract;
   --  Call the appropriate inherited dispatcher


   function Ref_Counter (Dispatcher : in Handler) return Natural;
   --  Returns the reference counter for Handler. If 0 is returned then this

   --  object is not referenced anymore, it is safe to deallocate ressources.


   type Handler_Class_Access is access all Handler'Class;

   procedure Free (Dispatcher : in out Handler_Class_Access);
   pragma Inline (Free);

private

   type Natural_Access is access all Natural;

   type Handler is abstract new Ada.Finalization.Controlled with record
      Ref_Counter : Natural_Access := null;
   end record;

end AWS.Dispatchers;