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%%%----------------------------------------------------------------------
%%% File : ejabberd_odbc_sup.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : ODBC connections supervisor
%%% Created : 22 Dec 2004 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(ejabberd_odbc_sup).
-author('alexey@process-one.net').
%% API
-export([start_link/1,
init/1,
get_pids/1,
get_random_pid/1
]).
-include("ejabberd.hrl").
-define(DEFAULT_POOL_SIZE, 10).
-define(DEFAULT_ODBC_START_INTERVAL, 30). % 30 seconds
% time to wait for the supervisor to start its child before returning
% a timeout error to the request
-define(CONNECT_TIMEOUT, 500). % milliseconds
start_link(Host) ->
supervisor:start_link({local, gen_mod:get_module_proc(Host, ?MODULE)},
?MODULE, [Host]).
init([Host]) ->
PoolSize = case ejabberd_config:get_local_option({odbc_pool_size, Host}) of
I when is_integer(I) ->
I;
undefined ->
?DEFAULT_POOL_SIZE;
Other ->
?ERROR_MSG("Wrong odbc_pool_size definition '~p' "
"for host ~p, default to ~p~n",
[Other, Host, ?DEFAULT_POOL_SIZE]),
?DEFAULT_POOL_SIZE
end,
StartInterval = case ejabberd_config:get_local_option({odbc_start_interval,
Host}) of
Interval when is_integer(Interval) ->
Interval;
undefined ->
?DEFAULT_ODBC_START_INTERVAL;
_Other2 ->
?ERROR_MSG("Wrong odbc_start_interval "
"definition '~p' for host ~p, "
"defaulting to ~p~n",
[_Other2, Host,
?DEFAULT_ODBC_START_INTERVAL]),
?DEFAULT_ODBC_START_INTERVAL
end,
{ok, {{one_for_one, PoolSize+1, StartInterval},
lists:map(
fun(I) ->
{I,
{ejabberd_odbc, start_link, [Host, StartInterval*1000]},
transient,
brutal_kill,
worker,
[?MODULE]}
end, lists:seq(1, PoolSize))}}.
get_pids(Host) ->
Proc = gen_mod:get_module_proc(Host, ?MODULE),
% throw an exception if supervisor is not ready (i.e. if it cannot
% start its children, if the database is down for example)
sys:get_status(Proc, ?CONNECT_TIMEOUT),
[Child ||
{_Id, Child, _Type, _Modules} <- supervisor:which_children(Proc),
Child /= undefined].
get_random_pid(Host) ->
Pids = get_pids(Host),
lists:nth(erlang:phash(now(), length(Pids)), Pids).
|
