%%%----------------------------------------------------------------------
%%% 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) 2002-2013 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, add_pid/2, remove_pid/2,
get_pids/1, get_random_pid/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-define(DEFAULT_POOL_SIZE, 10).
-define(DEFAULT_ODBC_START_INTERVAL, 30).
-define(CONNECT_TIMEOUT, 500).
-record(sql_pool, {host, pid}).
start_link(Host) ->
mnesia:create_table(sql_pool,
[{ram_copies, [node()]}, {type, bag},
{local_content, true},
{attributes, record_info(fields, sql_pool)}]),
mnesia:add_table_copy(sql_pool, node(), ram_copies),
F = fun () -> mnesia:delete({sql_pool, Host}) end,
mnesia:ets(F),
supervisor:start_link({local,
gen_mod:get_module_proc(Host, ?MODULE)},
?MODULE, [Host]).
init([Host]) ->
PoolSize = ejabberd_config:get_local_option(
{odbc_pool_size, Host},
fun(I) when is_integer(I), I>0 -> I end,
?DEFAULT_POOL_SIZE),
StartInterval = ejabberd_config:get_local_option(
{odbc_start_interval, Host},
fun(I) when is_integer(I), I>0 -> I end,
?DEFAULT_ODBC_START_INTERVAL),
{ok,
{{one_for_one, PoolSize * 10, 1},
lists:map(fun (I) ->
{I,
{ejabberd_odbc, start_link,
[Host, StartInterval * 1000]},
transient, 2000, worker, [?MODULE]}
end,
lists:seq(1, PoolSize))}}.
get_pids(Host) ->
Rs = mnesia:dirty_read(sql_pool, Host),
[R#sql_pool.pid || R <- Rs].
get_random_pid(Host) ->
Pids = get_pids(Host),
lists:nth(erlang:phash(now(), length(Pids)), Pids).
add_pid(Host, Pid) ->
F = fun () ->
mnesia:write(#sql_pool{host = Host, pid = Pid})
end,
mnesia:ets(F).
remove_pid(Host, Pid) ->
F = fun () ->
mnesia:delete_object(#sql_pool{host = Host, pid = Pid})
end,
mnesia:ets(F).
