------------------------------------------------------------------------------
--                              Ada Web Server                              --
--                                                                          --
--                     Copyright (C) 2000-2014, AdaCore                     --
--                                                                          --
--  This library is free software;  you can redistribute it and/or modify   --
--  it under terms of the  GNU General Public License  as published by the  --
--  Free Software  Foundation;  either version 3,  or (at your  option) any --
--  later version. This library is distributed in the hope that it will be  --
--  useful, but WITHOUT ANY WARRANTY;  without even the implied warranty of --
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                    --
--                                                                          --
--  As a special exception under Section 7 of GPL version 3, you are        --
--  granted additional permissions described in the GCC Runtime Library     --
--  Exception, version 3.1, as published by the Free Software Foundation.   --
--                                                                          --
--  You should have received a copy of the GNU General Public License and   --
--  a copy of the GCC Runtime Library Exception along with this program;    --
--  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see   --
--  <http://www.gnu.org/licenses/>.                                         --
--                                                                          --
--  As a special exception, if other files instantiate generics from this   --
--  unit, or you link this unit with other files to produce an executable,  --
--  this  unit  does not  by itself cause  the resulting executable to be   --
--  covered by the GNU General Public License. This exception does not      --
--  however invalidate any other reasons why the executable file  might be  --
--  covered by the  GNU Public License.                                     --
------------------------------------------------------------------------------

pragma Ada_2012;

--  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;
with AWS.Utils;

package AWS.Dispatchers is

   type Handler is abstract new Ada.Finalization.Controlled
     and AWS.Utils.Clonable with private;

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

   function Ref_Counter (Dispatcher : 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 resources.

   type Handler_Class_Access is access all Handler'Class;

   procedure Free (Dispatcher : in out Handler_Class_Access) with Inline;
   --  Release memory associated with the dispatcher

private

   type Handler is abstract new Ada.Finalization.Controlled
     and AWS.Utils.Clonable
   with record
      Ref_Counter : Utils.Counter_Access;
   end record;

   overriding procedure Initialize (Dispatcher : in out Handler);
   overriding procedure Adjust     (Dispatcher : in out Handler);
   overriding 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.

end AWS.Dispatchers;