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%% -------------------------------------------------------------------
%%
%% Riak: A lightweight, decentralized key-value store.
%%
%% Copyright (c) 2007-2010 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).
-export([stop/0, stop/1]).
-export([register_vnode_module/1, vnode_modules/0]).

%% @spec stop() -> ok
%% @doc Stop the riak application and the calling process.
stop() -> stop("riak stop requested").
stop(Reason) ->
    % we never do an application:stop because that makes it very hard
    % to really halt the runtime, which is what we need here.
    error_logger:info_msg(io_lib:format("~p~n",[Reason])),
    init:stop().

vnode_modules() ->
    case application:get_env(riak_core, vnode_modules) of
        undefined -> [];
        {ok, Mods} -> Mods
    end.

register_vnode_module(VNodeMod) when is_atom(VNodeMod) ->
    case application:get_env(riak_core, vnode_modules) of
        undefined ->
            application:set_env(riak_core, vnode_modules, [VNodeMod]);
        {ok, Mods} ->
            application:set_env(riak_core, vnode_modules, [VNodeMod|Mods])
    end,
    riak_core_ring_events:force_sync_update().
    
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