92 lines
2.6 KiB
Erlang
92 lines
2.6 KiB
Erlang
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%% @author Lo<4C>c Hoguin <essen@dev-extend.eu>
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%% @copyright 2010 Lo<4C>c Hoguin.
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%% @doc EGS shops database.
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%%
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%% This file is part of EGS.
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%%
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%% EGS is free software: you can redistribute it and/or modify
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%% it under the terms of the GNU Affero General Public License as
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%% published by the Free Software Foundation, either version 3 of the
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%% License, or (at your option) any later version.
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%%
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%% EGS 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
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%% GNU Affero General Public License for more details.
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%%
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%% You should have received a copy of the GNU Affero General Public License
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%% along with EGS. If not, see <http://www.gnu.org/licenses/>.
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-module(egs_shops_db).
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-behavior(gen_server).
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-export([start_link/0, stop/0, nth/2, read/1, reload/0]). %% API.
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]). %% gen_server.
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%% Use the module name for the server's name.
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-define(SERVER, ?MODULE).
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%% API.
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%% @spec start_link() -> {ok,Pid::pid()}
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start_link() ->
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gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
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%% @spec stop() -> stopped
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stop() ->
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gen_server:call(?SERVER, stop).
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%% @spec nth(ShopID, N) -> ItemID | undefined
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nth(ShopID, N) ->
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gen_server:call(?SERVER, {nth, ShopID, N}).
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%% @spec read(ShopID) -> list() | undefined
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read(ShopID) ->
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gen_server:call(?SERVER, {read, ShopID}).
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%% @spec reload() -> ok
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reload() ->
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gen_server:cast(?SERVER, reload).
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%% gen_server.
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init([]) ->
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case file:consult("priv/shops.conf") of
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{ok, Terms} ->
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error_logger:info_report("egs_shops_db started"),
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{ok, Terms};
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Error ->
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error_logger:error_report(["An error occurred when trying to load the shops configuration file:", Error]),
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Error
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end.
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handle_call({nth, ShopID, N}, _From, State) ->
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ListingID = proplists:get_value({shop, ShopID}, State),
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List = proplists:get_value({listing, ListingID}, State),
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{reply, lists:nth(N, List), State};
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handle_call({read, ShopID}, _From, State) ->
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ListingID = proplists:get_value({shop, ShopID}, State),
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{reply, proplists:get_value({listing, ListingID}, State), State};
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handle_call(stop, _From, State) ->
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{stop, normal, stopped, State};
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handle_call(_Request, _From, State) ->
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{reply, ignored, State}.
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handle_cast(reload, _State) ->
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{ok, Terms} = file:consult("priv/shops.conf"),
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{noreply, Terms};
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info(_Info, State) ->
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{noreply, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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