原始使用:
lager:info("handle_call _Request = ~p",[_Request]),
最本质是调用:
lager:do_log(info,
[
{application, mongrel},
{module, mongrel},
{function, handle_call},
{line, 79},
{pid, pid_to_list(self())},
{node, node()}
| lager:md()
],
"handle_call _Request= ~p",
[_Request],
4096,
4,
__Leveldemo_lager_server42,
__Tracesdemo_lager_server42,
lager_event,
__Piddemo_lager_server42
);
do_log(Severity, Metadata, Format, Args, Size, SeverityAsInt, LevelThreshold, TraceFilters, Sink, SinkPid)
再本质:
同步:
gen_event:notify(SinkPid, {log, LagerMsg});
异步:
gen_event:sync_notify(SinkPid, {log, LagerMsg})