xmpp.chapril.org-ejabberd/src/randoms.erl

%%%----------------------------------------------------------------------
%%% File    : randoms.erl
%%% Author  : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Random generation number wrapper
%%% Created : 13 Dec 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2010   ProcessOne
%%%
%%% This program 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 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
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU 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
%%%
%%%----------------------------------------------------------------------

-module(randoms).
-author('alexey@process-one.net').

-export([get_string/0]).

-export([start/0, init/0]).


start() ->
    case erlang:whereis(random_generator) of
        Pid when is_pid(Pid) ->
            true;
        undefined ->
            register(random_generator, spawn(randoms, init, []))
    end.

init() ->
    {A1, A2, A3} = now(),
    random:seed(A1,A2,A3),
    loop().

loop() ->
    receive
	{From, get_random, N} ->
	    From ! {random, random:uniform(N)},
	    loop();
	_ ->
	    loop()
    end.


get_string() ->
    random_generator ! {self(), get_random, 65536*65536},
    receive
	{random, R} ->
	    integer_to_list(R)
    end.