Erlang Behaviour Templates

new_gen_event.erl

-module().

-behavior(gen_event).

% Callbacks
-export([init/1]).
-export([handle_event/2]).
-export([handle_call/2]).
-export([handle_info/2]).
-export([terminate/2]).

%--- Callbacks -----------------------------------------------------------------

init(_Args) -> {ok, undefined}.

handle_event(Event, _State) -> error({unknown_event, Event}).

handle_call(Request, _State) -> error({unknown_request, Request}).

handle_info(Info, _State) -> error({unknown_info, Info}).

terminate(_Arg, _State) -> undefined.

new_gen_server.erl

-module().

-behavior(gen_server).

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

% Callbacks
-export([init/1]).
-export([handle_call/3]).
-export([handle_cast/2]).
-export([handle_info/2]).

%--- API -----------------------------------------------------------------------

start_link() -> gen_server:start_link({local, ?MODULE}, ?MODULE, undefined, []).

%--- Callbacks -----------------------------------------------------------------

init(undefined) -> {ok, undefined}.

handle_call(Request, From, _State) -> error({unknown_request, Request, From}).

handle_cast(Request, _State) -> error({unknown_cast, Request}).

handle_info(Info, _State) -> error({unknown_info, Info}).

new_gen_statem.erl

-module().

-behavior(gen_statem).

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

% Callbacks
-export([init/1]).
-export([callback_mode/0]).
-export([handle_event/4]).

%--- API -----------------------------------------------------------------------

start_link() -> gen_statem:start_link({local, ?MODULE}, ?MODULE, undefined, []).

%--- Callbacks -----------------------------------------------------------------

init(undefined) -> {ok, state, data}.

callback_mode() -> handle_event_function.

handle_event({call, _From}, EventData, State, _Data) ->
    error({unhandled_call, EventData, State});
handle_event(Event, EventData, State, _Data) ->
    error({unhandled_event, Event, EventData, State}).

new_supervisor.erl

-module().

-behaviour(supervisor).

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

% Callbacks
-export([init/1]).

%--- API -----------------------------------------------------------------------

start_link() ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, []).

%--- Callbacks -----------------------------------------------------------------

init([]) ->
    {ok, {#{}, []}}.