2 * Copyright (C) 2003, HELM Team.
4 * This file is part of HELM, an Hypertextual, Electronic
5 * Library of Mathematics, developed at the Computer Science
6 * Department, University of Bologna, Italy.
8 * HELM is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * HELM is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with HELM; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
23 * For details, see the HELM World-Wide-Web page,
24 * http://cs.unibo.it/helm/.
27 exception Key_already_in of string;;
28 exception Key_not_found of string;;
31 let perm = 420 in (* permission 644 in decimal notation *)
32 let open_dbm () = Dbm.opendbm dbname [ Dbm.Dbm_rdwr; Dbm.Dbm_create ] perm in
36 inherit ThreadSafe.threadSafe
38 val mutable db = open_dbm ()
40 (*initializer Gc.finalise Dbm.close db (* close db on GC *)*)
42 method add key value =
46 with Dbm.Dbm_error "Entry already exists" -> raise (Key_already_in key)
53 with Dbm.Dbm_error "dbm_delete" -> raise (Key_not_found key)
58 try Dbm.find db key with Not_found -> raise (Key_not_found key)
61 method iter (f: string -> string -> unit) =
77 let file = dbname ^ ext in
78 if Sys.file_exists file then Sys.remove file)
79 [".dir"; ".pag"; ".db"];