-spec get_history(binary(), pos_integer()) -> [map()].

-spec handle_call(term(), gen_server:from(), map()) -> {reply, term(), map(), pos_integer()}.

-spec handle_cast(term(), map()) -> {noreply, map(), pos_integer()}.

-spec handle_info(term(), map()) -> {noreply, map(), pos_integer()} | {stop, normal, map()}.

-spec init({binary(), binary()}) -> {ok, map(), pos_integer()}.

-spec join(binary(), pid()) -> ok.

-spec leave(binary(), pid()) -> ok.

-spec send_message(binary(), binary(), binary()) -> ok.

-spec start_link(binary(), binary()) -> gen_server:start_ret().

-spec terminate(term(), map()) -> ok.