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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) 2002-2013 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").
-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
-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 = 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*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).
|
