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%% This file is provided to you 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.
%% Copyright (c) 2007-2010 Basho Technologies, Inc. All Rights Reserved.
-module(riak_core_ring_handler).
-behaviour(gen_event).
%% gen_event callbacks
-export([init/1, handle_event/2, handle_call/2,
handle_info/2, terminate/2, code_change/3]).
-record(state, {}).
%% ===================================================================
%% gen_event callbacks
%% ===================================================================
init([]) ->
%% Pull the initial ring and make sure all vnodes are started
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
ensure_vnodes_started(Ring),
{ok, #state{}}.
handle_event({ring_update, Ring}, State) ->
%% Make sure all vnodes are started...
riak_core_ring_util:ensure_vnodes_started(Ring),
riak_core_vnode_manager:ring_changed(Ring),
{ok, State}.
handle_call(_Event, State) ->
{ok, ok, State}.
handle_info(_Info, State) ->
{ok, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%% ===================================================================
%% Internal functions
%% ===================================================================
wait_for_app(_, 0, _) ->
bummer;
wait_for_app(App, Count, Sleep) ->
case lists:keymember(App, 1, application:which_applications()) of
true ->
ok;
false ->
timer:sleep(Sleep),
wait_for_app(App, Count - 1, Sleep)
end.
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