(* Copyright (C) 2004-2011, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM 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.
 * 
 * HELM 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 HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

type session_id = Uuidm.t

exception UsernameCollision of string

val lookup_user : string -> (string * session_id option)

val user_of_session : session_id -> string

val create_session : string -> session_id

val get_session_owner : session_id -> string

val get_status : session_id -> MatitaEngine.status

val get_history : session_id -> MatitaEngine.status list

val set_status : session_id -> MatitaEngine.status -> unit

val set_history : session_id -> MatitaEngine.status list -> unit

val logout_user : session_id -> unit

val remove_user : string -> unit

val serialize : unit -> unit

val deserialize : unit -> unit

val add_user : string -> string -> unit