genevent.erl

%%%-------------------------------------------------------------------
%%% @author {{author_name}} <{{author_email}}>
%%% @copyright (C) {{copyright_year}}, {{copyright_owner}}
%%% @doc
%%%
%%% @end
%%% Created :  {{now_ts}} by {{author_name}} <{{author_email}}>
%%%-------------------------------------------------------------------
-module('{{eventid}}').

-behaviour(gen_event).

%% API
-export([start_link/0,
         add_handler/0]).

%% gen_event callbacks
-export([init/1,
         handle_event/2,
         handle_call/2,
         handle_info/2,
         terminate/2,
         code_change/3]).

-define(SERVER, ?MODULE).

-record(state, {}).

%%%===================================================================
%%% gen_event callbacks
%%%===================================================================

%%--------------------------------------------------------------------
%% @doc
%% Creates an event manager
%%
%% @spec start_link() -> {ok, Pid} | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
    gen_event:start_link({local, ?SERVER}).

%%--------------------------------------------------------------------
%% @doc
%% Adds an event handler
%%
%% @spec add_handler() -> ok | {'EXIT', Reason} | term()
%% @end
%%--------------------------------------------------------------------
add_handler() ->
    gen_event:add_handler(?SERVER, ?MODULE, []).

%%%===================================================================
%%% gen_event callbacks
%%%===================================================================

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever a new event handler is added to an event manager,
%% this function is called to initialize the event handler.
%%
%% @spec init(Args) -> {ok, State}
%% @end
%%--------------------------------------------------------------------
init([]) ->
    {ok, #state{}}.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever an event manager receives an event sent using
%% gen_event:notify/2 or gen_event:sync_notify/2, this function is
%% called for each installed event handler to handle the event.
%%
%% @spec handle_event(Event, State) ->
%%                          {ok, State} |
%%                          {swap_handler, Args1, State1, Mod2, Args2} |
%%                          remove_handler
%% @end
%%--------------------------------------------------------------------
handle_event(Event, State) ->
    lager:warning("Can't handle event: ~p", [Event]),
    {ok, State}.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever an event manager receives a request sent using
%% gen_event:call/3,4, this function is called for the specified
%% event handler to handle the request.
%%
%% @spec handle_call(Request, State) ->
%%                   {ok, Reply, State} |
%%                   {swap_handler, Reply, Args1, State1, Mod2, Args2} |
%%                   {remove_handler, Reply}
%% @end
%%--------------------------------------------------------------------
handle_call(Request, State) ->
    lager:warning("Can't handle request: ~p", [Request]),
    {ok, {error, invalid_req}, State}.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% This function is called for each installed event handler when
%% an event manager receives any other message than an event or a
%% synchronous request (or a system message).
%%
%% @spec handle_info(Info, State) ->
%%                         {ok, State} |
%%                         {swap_handler, Args1, State1, Mod2, Args2} |
%%                         remove_handler
%% @end
%%--------------------------------------------------------------------
handle_info(Info, State) ->
    lager:warning("Can't handle info: ~p", [Info]),
    {ok, State}.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever an event handler is deleted from an event manager, this
%% function is called. It should be the opposite of Module:init/1 and
%% do any necessary cleaning up.
%%
%% @spec terminate(Reason, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
    ok.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
    {ok, State}.

%%%===================================================================
%%% Internal functions
%%%===================================================================