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sel_application.erl
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sel_application.erl
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%%% Copyright (c) 2012, Samuel Rivas <samuelrivas@gmail.com>
%%% All rights reserved.
%%% Redistribution and use in source and binary forms, with or without
%%% modification, are permitted provided that the following conditions are met:
%%% * Redistributions of source code must retain the above copyright
%%% notice, this list of conditions and the following disclaimer.
%%% * Redistributions in binary form must reproduce the above copyright
%%% notice, this list of conditions and the following disclaimer in the
%%% documentation and/or other materials provided with the distribution.
%%% * Neither the name the author nor the names of its contributors may
%%% be used to endorse or promote products derived from this software
%%% without specific prior written permission.
%%%
%%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
%%% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
%%% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
%%% ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
%%% INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
%%% (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
%%% LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
%%% ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
%%% (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
%%% THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
%%% @doc Some useful functions to handle applications
-module(sel_application).
-export([start_app/1, stop_apps/1]).
%% @doc Starts an application and all its dependencies.
%%
%% Returns the list of actually started applications, in starting order.
%%
%% @throws too_much_recursion
-spec start_app(atom()) -> [atom()].
start_app(App) ->
lists:flatten(start_app(App, 30)).
-spec start_app(atom(),0..30) -> [atom()].
start_app(_, 0) ->
throw(too_much_recursion);
start_app(App, N) ->
case application:start(App) of
{error, {already_started, App}} ->
[];
{error, {not_started, OtherApp}} ->
[start_app(OtherApp, N - 1),
start_app(App, N - 1)];
ok ->
[App]
end.
%% @doc Stops all the applications in `Apps' in reverse order
%%
%% Useful to stop the applications started by {@link start_app/1}
-spec stop_apps([atom()]) -> 'ok'.
stop_apps(Apps) ->
lists:foreach(fun(A) -> application:stop(A) end, lists:reverse(Apps)),
ok.