(*
- * Copyright (C) 2000, HELM Team.
+ * Copyright (C) 2003:
+ * Stefano Zacchiroli <zack@cs.unibo.it>
+ * for the HELM Team http://helm.cs.unibo.it/
*
* This file is part of HELM, an Hypertextual, Electronic
* Library of Mathematics, developed at the Computer Science
* MA 02111-1307, USA.
*
* For details, see the HELM World-Wide-Web page,
- * http://cs.unibo.it/helm/.
+ * http://helm.cs.unibo.it/
*)
exception Key_already_in of string;;
class map dbname =
let perm = 420 in (* permission 644 in decimal notation *)
- let db = Dbm.opendbm dbname [ Dbm.Dbm_rdwr; Dbm.Dbm_create ] perm in
+ let open_dbm () = Dbm.opendbm dbname [ Dbm.Dbm_rdwr; Dbm.Dbm_create ] perm in
+
object (self)
inherit ThreadSafe.threadSafe
- initializer Gc.finalise Dbm.close db (* close db on GC *)
+ val mutable db = open_dbm ()
+
+ (*initializer Gc.finalise Dbm.close db (* close db on GC *)*)
method add key value =
self#doWriter (lazy (
with Dbm.Dbm_error "Entry already exists" -> raise (Key_already_in key)
))
+ method replace key value =
+ self#doWriter (lazy (
+ Dbm.replace db key value
+ ))
+
method remove key =
self#doWriter (lazy (
try
Dbm.iter f db
))
+ method sync =
+ self#doWriter (lazy (
+ Dbm.close db;
+ db <- open_dbm ()
+ ))
+
method clear =
self#doWriter (lazy (
- Dbm.iter (fun k _ -> Dbm.remove db k) db
+ Dbm.close db;
+ List.iter
+ (fun ext ->
+ let file = dbname ^ ext in
+ if Sys.file_exists file then Sys.remove file)
+ [".dir"; ".pag"; ".db"];
+ db <- open_dbm ()
+ ))
+
+ method close =
+ self#doWriter (lazy (
+ Dbm.close db
))
end