-define(MSGSTR(M,L,S), lists:concat([atom_to_list(M), ".", integer_to_list(L), ": ", S, "~n"])).
-define(INFO(S, A), error_logger:info_msg(?MSGSTR(?MODULE, ?LINE, S), A)).
-define(ERR(S, A), error_logger:error_msg(?MSGSTR(?MODULE, ?LINE, S), A)).
-define(WARN(S, A), error_logger:warning_msg(?MSGSTR(?MODULE, ?LINE, S), A)).