mirror of
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125 lines
3.5 KiB
Erlang
125 lines
3.5 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_odbc_sup.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : ODBC connections supervisor
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%%% Created : 22 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2010 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_odbc_sup).
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-author('alexey@process-one.net').
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%% API
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-export([start_link/1,
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init/1,
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add_pid/2,
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remove_pid/2,
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get_pids/1,
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get_random_pid/1
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]).
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-include("ejabberd.hrl").
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-define(DEFAULT_POOL_SIZE, 10).
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-define(DEFAULT_ODBC_START_INTERVAL, 30). % 30 seconds
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% time to wait for the supervisor to start its child before returning
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% a timeout error to the request
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-define(CONNECT_TIMEOUT, 500). % milliseconds
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-record(sql_pool, {host, pid}).
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start_link(Host) ->
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mnesia:create_table(sql_pool,
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[{ram_copies, [node()]},
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{type, bag},
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{local_content, true},
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{attributes, record_info(fields, sql_pool)}]),
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mnesia:add_table_copy(local_config, node(), ram_copies),
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F = fun() ->
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mnesia:delete({sql_pool, Host})
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end,
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mnesia:ets(F),
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supervisor:start_link({local, gen_mod:get_module_proc(Host, ?MODULE)},
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?MODULE, [Host]).
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init([Host]) ->
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PoolSize = case ejabberd_config:get_local_option({odbc_pool_size, Host}) of
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I when is_integer(I) ->
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I;
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undefined ->
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?DEFAULT_POOL_SIZE;
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Other ->
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?ERROR_MSG("Wrong odbc_pool_size definition '~p' "
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"for host ~p, default to ~p~n",
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[Other, Host, ?DEFAULT_POOL_SIZE]),
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?DEFAULT_POOL_SIZE
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end,
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StartInterval = case ejabberd_config:get_local_option({odbc_start_interval,
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Host}) of
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Interval when is_integer(Interval) ->
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Interval;
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undefined ->
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?DEFAULT_ODBC_START_INTERVAL;
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_Other2 ->
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?ERROR_MSG("Wrong odbc_start_interval "
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"definition '~p' for host ~p, "
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"defaulting to ~p~n",
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[_Other2, Host,
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?DEFAULT_ODBC_START_INTERVAL]),
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?DEFAULT_ODBC_START_INTERVAL
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end,
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{ok, {{one_for_one, PoolSize+1, StartInterval},
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lists:map(
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fun(I) ->
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{I,
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{ejabberd_odbc, start_link, [Host, StartInterval*1000]},
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transient,
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brutal_kill,
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worker,
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[?MODULE]}
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end, lists:seq(1, PoolSize))}}.
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get_pids(Host) ->
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Rs = mnesia:dirty_read(sql_pool, Host),
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[R#sql_pool.pid || R <- Rs].
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get_random_pid(Host) ->
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Pids = get_pids(Host),
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lists:nth(erlang:phash(now(), length(Pids)), Pids).
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add_pid(Host, Pid) ->
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F = fun() ->
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mnesia:write(
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#sql_pool{host = Host,
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pid = Pid})
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end,
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mnesia:ets(F).
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remove_pid(Host, Pid) ->
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F = fun() ->
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mnesia:delete_object(
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#sql_pool{host = Host,
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pid = Pid})
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end,
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mnesia:ets(F).
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