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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | (* Lightweight thread library for OCaml
* http://www.ocsigen.org/lwt
* Module Lwt_throttle
* Copyright (C) 2008 Stéphane Glondu
* Laboratoire PPS - CNRS Université Paris Diderot
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, with linking exceptions;
* either version 2.1 of the License, or (at your option) any later
* version. See COPYING file for details.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*)
(** Rate limiters *)
(** This module defines rate limiters. A rate limiter is parametrized
by its limit and a maximum waiting time. The [wait] function will
collaboratively hang for a delay necessary to respect the
limit. If that delay exceeds the maximum waiting time, [wait]
returns [false]; otherwise it returns [true]. *)
module type S = sig
type key
type t
val create : rate:int -> max:int -> n:int -> t
(**
@param rate maximum number of connections per second
@param max maximum waiting time (in seconds)
@param n initial size of the hash table
*)
val wait : t -> key -> bool Lwt.t
(** @return [false] if maximum reached, [true] else *)
end
module Make (H : Hashtbl.HashedType) : S with type key = H.t
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