166 lines
5.8 KiB
Erlang
166 lines
5.8 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_node_groups.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Distributed named node groups based on pg2 module
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%%% Created : 1 Nov 2006 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2013 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_node_groups).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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%% API
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-export([start_link/0,
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join/1,
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leave/1,
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get_members/1,
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get_closest_node/1]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-define(PG2, pg2).
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-record(state, {}).
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%%====================================================================
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%% API
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
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%% Description: Starts the server
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%%--------------------------------------------------------------------
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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join(Name) ->
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PG = {?MODULE, Name},
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pg2:create(PG),
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pg2:join(PG, whereis(?MODULE)).
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leave(Name) ->
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PG = {?MODULE, Name},
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pg2:leave(PG, whereis(?MODULE)).
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get_members(Name) ->
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PG = {?MODULE, Name},
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[node(P) || P <- pg2:get_members(PG)].
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get_closest_node(Name) ->
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PG = {?MODULE, Name},
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node(pg2:get_closest_pid(PG)).
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init(Args) -> {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%% Description: Initiates the server
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%%--------------------------------------------------------------------
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init([]) ->
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{FE, BE} =
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case ejabberd_config:get_option(
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node_type,
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fun(frontend) -> frontend;
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(backend) -> backend;
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(generic) -> generic
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end, generic) of
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frontend ->
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{true, false};
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backend ->
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{false, true};
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generic ->
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{true, true};
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undefined ->
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{true, true}
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end,
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if
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FE ->
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join(frontend);
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true ->
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ok
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end,
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if
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BE ->
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join(backend);
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true ->
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ok
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end,
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{ok, #state{}}.
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%%--------------------------------------------------------------------
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%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} |
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%% {stop, Reason, State}
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%% Description: Handling call messages
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%%--------------------------------------------------------------------
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_cast(Msg, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling cast messages
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%%--------------------------------------------------------------------
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handle_cast(_Msg, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info(Info, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling all non call/cast messages
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%%--------------------------------------------------------------------
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handle_info(_Info, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate(Reason, State) -> void()
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%% Description: This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any necessary
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%% cleaning up. When it returns, the gen_server terminates with Reason.
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%% The return value is ignored.
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%%--------------------------------------------------------------------
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terminate(_Reason, _State) ->
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ok.
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%%--------------------------------------------------------------------
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%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
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%% Description: Convert process state when code is changed
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%%--------------------------------------------------------------------
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%--------------------------------------------------------------------
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%%% Internal functions
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%%--------------------------------------------------------------------
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