On 11.05.2012 12:47, Robert Elliot wrote:
> Short answer: no.
>
> Longer answer:
>
> The point of SLF4J is it's a common facade or interface, you then
> choose an implementation (logback, slf4j-log4j, slf4j-jdk14 etc.).
> Obviously the existing implementations only know about & support the
> levels defined on the existing interface.
Yep, as indicates (or fails to indicate) SLF4J is just an abstraction
layer for logging frameworks.
> Obviously you could write your own interface that extends the slf4j
> Logger interface and adds those methods, but what would you do with
> the calls to them? To get support for new levels you would need to
> write your own implementation which implements your new interface with
> its new methods. You'd then have a coupling between your custom
> implementation and your custom extension of the SLF4J interface, and
> in all probability a tight coupling from your custom implementation to
> an existing logging subsystem that supports defining new levels.
The above could be seen as a critique of abstraction layers or at
least it highlights the difficulty of getting abstractions layers
right.
> I believe Markers are intended to support some of the use cases that
> might otherwise be achieved by custom log levels.
Correct. Markers give you a another dimension for filtering
events. Instead of the infoPlus level, you would use the PLUS
marker. SLF4J support the following syntax:
Marker PLUS = MarkerFactory.getMarker("PLUS");
logger.info(PLUS, "some message");
HTH,
--
Ceki
http://twitter.com/#!/ceki
----- Original Message -----
From: "William Shatner"<[email protected]>
To: [email protected]
Sent: Friday, 11 May, 2012 11:27:33 AM
Subject: [slf4j-user] Extend slf4j Tracing Levels
Hi,
Is it possible to extend slf4j tracing levels to have more fine
grained levels beyond the standard error,info etc.
e.g
logger.info
logger.infoPlus
...
logger.error
logger.error1
logger.error2
..
Thanks,
Will
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