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%%% ====================================================================
%%% ``The contents of this file are subject to the Erlang Public License,
%%% Version 1.1, (the "License"); you may not use this file except in
%%% compliance with the License. You should have received a copy of the
%%% Erlang Public License along with this software. If not, it can be
%%% retrieved via the world wide web at http://www.erlang.org/.
%%%
%%% Software distributed under the License is distributed on an "AS IS"
%%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%%% the License for the specific language governing rights and limitations
%%% under the License.
%%%
%%% The Initial Developer of the Original Code is ProcessOne.
%%% Portions created by ProcessOne are Copyright 2006-2013, ProcessOne
%%% All Rights Reserved.''
%%% This software is copyright 2006-2013, ProcessOne.
%%%
%%%
%%% @copyright 2006-2013 ProcessOne
%%% @author Christophe Romain <christophe.romain@process-one.net>
%%% [http://www.process-one.net/]
%%% @version {@vsn}, {@date} {@time}
%%% @end
%%% ====================================================================
%% important note:
%% new/1 and free/2 MUST be called inside a transaction bloc
-module(pubsub_index_dev).
-author('christophe.romain@process-one.net').
-include("pubsub_dev.hrl").
-export([
init/1,
new/2,
free/3
]).
-import(pubsub_db_mnesia,
[
table/2
]).
%%
-spec(init/1 ::
(
Suffix::atom()) -> 'ok'
).
init(Suffix) ->
mnesia:create_table(table('pubsub_index_dev', Suffix),
[{disc_copies, [node()]},
{record_name, pubsub_index_dev},
{attributes, record_info(fields, pubsub_index_dev)}]).
%%
-spec(new/2 ::
(
Suffix :: atom(),
Index :: exmpp_pubsub:index())
-> Idx::exmpp_pubsub:nodeIdx()
).
new(Suffix, Index) ->
case
mnesia:read(Table_Pubsub_Index = table('pubsub_index_dev', Suffix),
Index, write)
of
[#pubsub_index_dev{free = []} = Pubsub_Index] ->
mnesia:write(Table_Pubsub_Index,
Pubsub_Index#pubsub_index_dev{
last = Idx = Pubsub_Index#pubsub_index_dev.last + 1
},
write),
Idx;
[#pubsub_index_dev{free = [Idx|Free]} = Pubsub_Index] ->
mnesia:write(Table_Pubsub_Index,
Pubsub_Index#pubsub_index_dev{
free = Free
},
write),
Idx;
_ ->
mnesia:write(Table_Pubsub_Index,
#pubsub_index_dev{index = Index, last = 1, free = []}, write),
1
end.
%%
-spec(free/3 ::
(
Suffix :: atom(),
Index :: exmpp_pubsub:index(),
Idx :: exmpp_pubsub:nodeIdx())
-> 'ok'
).
free(Suffix, Index, Idx) ->
case
mnesia:read(Table_Pubsub_Index = table('pubsub_index_dev', Suffix),
Index, write)
of
[Pubsub_Index] ->
mnesia:write(Table_Pubsub_Index,
Pubsub_Index#pubsub_index_dev{
free = [Idx | Pubsub_Index#pubsub_index_dev.free]
},
write);
_ ->
ok
end.
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