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%% -------------------------------------------------------------------
%% Copyright (c) 2007-2011 Basho Technologies, Inc. All Rights Reserved.
%%
%% 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.
%%
%% -------------------------------------------------------------------
-module(riak_core_vnode_proxy_sup).
-behaviour(supervisor).
-export([start_link/0, init/1]).
-export([start_proxy/2, stop_proxy/2, start_proxies/1]).
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
init([]) ->
%% Populate supervisor list with proxies for already registered vnode
%% modules. Ensures restart of proxies after a crash of this supervisor.
Indices = get_indices(),
VMods = riak_core:vnode_modules(),
Proxies = [proxy_ref(Mod, Index) || {_, Mod} <- VMods,
Index <- Indices],
{ok, {{one_for_one, 5, 10}, Proxies}}.
start_proxy(Mod, Index) ->
Ref = proxy_ref(Mod, Index),
Pid = case supervisor:start_child(?MODULE, Ref) of
{ok, Child} -> Child;
{error, {already_started, Child}} -> Child
end,
Pid.
stop_proxy(Mod, Index) ->
supervisor:terminate_child(?MODULE, {Mod, Index}),
supervisor:delete_child(?MODULE, {Mod, Index}),
ok.
start_proxies(Mod) ->
lager:debug("Starting vnode proxies for: ~p", [Mod]),
Indices = get_indices(),
[start_proxy(Mod, Index) || Index <- Indices],
ok.
%% @private
proxy_ref(Mod, Index) ->
{{Mod, Index}, {riak_core_vnode_proxy, start_link, [Mod, Index]},
permanent, 5000, worker, [riak_core_vnode_proxy]}.
%% @private
get_indices() ->
{ok, Ring} = riak_core_ring_manager:get_raw_ring(),
AllOwners = riak_core_ring:all_owners(Ring),
[Idx || {Idx, _} <- AllOwners].
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