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%% @author Justin Sheehy <justin@basho.com>
%% @author Andy Gross <andy@basho.com>
%% @copyright 2007-2008 Basho Technologies
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%% @doc Supervisor for the webmachine application.
-module(webmachine_sup).
-behaviour(supervisor).
%% External exports
-export([start_link/0, upgrade/0, start_logger/1]).
-export([start_perf_logger/1]).
%% supervisor callbacks
-export([init/1]).
%% @spec start_link() -> ServerRet
%% @doc API for starting the supervisor.
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
start_logger(BaseDir) ->
LoggerModule =
case application:get_env(webmachine, webmachine_logger_module) of
{ok, Val} -> Val;
_ -> webmachine_logger
end,
ChildSpec =
{webmachine_logger,
{LoggerModule, start_link, [BaseDir]},
permanent, 5000, worker, dynamic},
supervisor:start_child(?MODULE, ChildSpec).
start_perf_logger(BaseDir) ->
ChildSpec =
{webmachine_perf_logger,
{webmachine_perf_logger, start_link, [BaseDir]},
permanent, 5000, worker, [webmachine_perf_logger]},
supervisor:start_child(?MODULE, ChildSpec).
%% @spec upgrade() -> ok
%% @doc Add processes if necessary.
upgrade() ->
{ok, {_, Specs}} = init([]),
Old = sets:from_list(
[Name || {Name, _, _, _} <- supervisor:which_children(?MODULE)]),
New = sets:from_list([Name || {Name, _, _, _, _, _} <- Specs]),
Kill = sets:subtract(Old, New),
sets:fold(fun (Id, ok) ->
supervisor:terminate_child(?MODULE, Id),
supervisor:delete_child(?MODULE, Id),
ok
end, ok, Kill),
[supervisor:start_child(?MODULE, Spec) || Spec <- Specs],
ok.
%% @spec init([]) -> SupervisorTree
%% @doc supervisor callback.
init([]) ->
Processes = [],
{ok, {{one_for_one, 9, 10}, Processes}}.
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