110 lines
3.3 KiB
Erlang
110 lines
3.3 KiB
Erlang
%%% ====================================================================
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%%% ``The contents of this file are subject to the Erlang Public License,
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%%% Version 1.1, (the "License"); you may not use this file except in
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%%% compliance with the License. You should have received a copy of the
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%%% Erlang Public License along with this software. If not, it can be
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%%% retrieved via the world wide web at http://www.erlang.org/.
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%%%
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%%%
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%%% Software distributed under the License is distributed on an "AS IS"
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%%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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%%% the License for the specific language governing rights and limitations
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%%% under the License.
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%%%
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%%%
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%%% The Initial Developer of the Original Code is ProcessOne.
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%%% Portions created by ProcessOne are Copyright 2006-2015, ProcessOne
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%%% All Rights Reserved.''
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%%% This software is copyright 2006-2015, ProcessOne.
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%%%
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%%%
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%%% @copyright 2006-2015 ProcessOne
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%%% @author Christophe Romain <christophe.romain@process-one.net>
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%%% [http://www.process-one.net/]
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%%% @version {@vsn}, {@date} {@time}
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%%% @end
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%%% ====================================================================
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%%% @doc The module <strong>{@module}</strong> is the PubSub node tree plugin that
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%%% allow virtual nodes handling. This prevent storage of nodes.
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%%% <p>PubSub node tree plugins are using the {@link gen_nodetree} behaviour.</p>
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%%% <p>This plugin development is still a work in progress. Due to optimizations in
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%%% mod_pubsub, this plugin can not work anymore without altering functioning.
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%%% Please, send us comments, feedback and improvements.</p>
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-module(nodetree_virtual).
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-behaviour(gen_pubsub_nodetree).
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-author('christophe.romain@process-one.net').
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-include("pubsub.hrl").
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-include("jlib.hrl").
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-export([init/3, terminate/2, options/0, set_node/1,
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get_node/3, get_node/2, get_node/1, get_nodes/2,
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get_nodes/1, get_parentnodes/3, get_parentnodes_tree/3,
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get_subnodes/3, get_subnodes_tree/3, create_node/6,
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delete_node/2]).
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init(_Host, _ServerHost, _Opts) ->
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ok.
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terminate(_Host, _ServerHost) ->
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ok.
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options() ->
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[{virtual_tree, true}].
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set_node(_Node) ->
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ok.
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get_node(Host, Node, _From) ->
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get_node(Host, Node).
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get_node(Host, Node) ->
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get_node(nodeidx(Host, Node)).
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get_node(Nidx) ->
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{Host, Node} = nodeid(Nidx),
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Record = #pubsub_node{nodeid = Node, id = Nidx},
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Module = jlib:binary_to_atom(<<"node_", (Record#pubsub_node.type)/binary>>),
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Record#pubsub_node{owners = [{<<"">>, Host, <<"">>}],
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options = Module:options()}.
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get_nodes(Host, _From) ->
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get_nodes(Host).
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get_nodes(_Host) ->
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[].
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get_parentnodes(_Host, _Node, _From) ->
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[].
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get_parentnodes_tree(Host, Node, From) ->
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case get_node(Host, Node, From) of
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Node when is_record(Node, pubsub_node) -> [{0, [Node]}];
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_Error -> []
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end.
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get_subnodes(Host, Node, _From) ->
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get_subnodes(Host, Node).
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get_subnodes(_Host, _Node) ->
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[].
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get_subnodes_tree(Host, Node, _From) ->
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get_subnodes_tree(Host, Node).
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get_subnodes_tree(_Host, _Node) ->
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[].
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create_node(Host, Node, _Type, _Owner, _Options, _Parents) ->
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{error, {virtual, {Host, Node}}}.
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delete_node(Host, Node) ->
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[get_node(Host, Node)].
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%% internal helper
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nodeidx(Host, Node) -> term_to_binary({Host, Node}).
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nodeid(Nidx) -> binary_to_term(Nidx).
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