------------------------------------------------------------------------------
--                              Ada Web Server                              --
--                                                                          --
--                     Copyright (C) 2003-2009, AdaCore                     --
--                                                                          --
--  This library is free software; you can redistribute it and/or modify    --
--  it under the terms of the GNU General Public License as published by    --
--  the Free Software Foundation; either version 2 of the License, 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.  See the GNU       --
--  General Public License for more details.                                --
--                                                                          --
--  You should have received a copy of the GNU General Public License       --
--  along with this library; if not, write to the Free Software Foundation, --
--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.          --
--                                                                          --
--  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.                                     --
------------------------------------------------------------------------------

with AWS.Default;
with AWS.Resources.Streams;

package AWS.Services.Transient_Pages is

   function Get_URI return String;
   --  Create a unique URI, must be used to register a transient web page

   procedure Register
     (URI      : String;
      Resource : AWS.Resources.Streams.Stream_Access;
      Lifetime : Duration := Default.Transient_Lifetime);
   --  Register a new transient page, this page will be deleted after Lifetime
   --  seconds.

   function Get (URI : String) return AWS.Resources.Streams.Stream_Access;
   --  Returns the stream access for the URI or null if this URI has not been
   --  registered.

private

   -------------------
   --  Cleaner task --
   -------------------

   task type Cleaner is
      entry Stop;
   end Cleaner;

   type Cleaner_Access is access Cleaner;

   Cleaner_Task : Cleaner_Access;

   ---------------------
   -- Cleaner_Control --
   ---------------------

   protected Cleaner_Control is

      procedure Register
        (Transient_Check_Interval : Duration;
         Need_Start               : out Boolean);
      --  Increment number of registerd servers. Set Need_Start flag to True
      --  if it is necessary to start cleaner task.

      procedure Stop (Need_Release : out Boolean);
      --  Stop the cleaner task when there is no more server using it.
      --  Need_Release is set to True if the Cleaner_Task can be released.

   private
      Server_Count : Natural := 0;
   end Cleaner_Control;

end AWS.Services.Transient_Pages;
