[slf4j-user] Question: supporting ALL, OFF level

[Ceki Gülcü]

Hello Dongjin,

Thank you very much for your very well researched message.

While the SLF4J API allows for logging at levels TRACE, DEBUG, INFO,
WARN and ERROR, the API does *not* allow the user to set the level of a
logger.

I would say that given that it makes no sense to log at levels OFF or
ON, it follows that there is no need to introduce these levels in SLF4J.

I would like to take you up for your offer for help, Do you have other
ideas for contribution?

Best

-- 
Ceki Gülcü

Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch



On 1/27/2022 2:36 PM, Dongjin Lee wrote:
> Hi, slf4j community,
> 
> I have a question on slf4j-api's Level definition.
> 
> As far as I know, the slf4j community is planning to support the dynamic
> logging level change feature with https://jira.qos.ch/browse/SLF4J-124
> <https://jira.qos.ch/browse/SLF4J-124>. However, since slf4j-api only
> defines five levels, omitting `ALL` and `OFF` (below), we can't call a
> method like `logger.setLevel(Level.OFF)` - which is available in other
> logging frameworks.
> 
> https://github.com/qos-ch/slf4j/blob/master/slf4j-api/src/main/java/org/slf4j/event/EventConstants.java
> <https://github.com/qos-ch/slf4j/blob/master/slf4j-api/src/main/java/org/slf4j/event/EventConstants.java>
> 
> For example, logback supports seven levels (i.e., five common ones +
> ALL, OFF):
> 
> https://github.com/qos-ch/logback/blob/master/logback-classic/src/main/java/ch/qos/logback/classic/Level.java
> <https://github.com/qos-ch/logback/blob/master/logback-classic/src/main/java/ch/qos/logback/classic/Level.java>
> 
> Log4j supports 8 levels (i.e., five common ones + FATAL, ALL, OFF):
> 
> https://logging.apache.org/log4j/2.x/log4j-api/apidocs/org/apache/logging/log4j/Level.html
> <https://logging.apache.org/log4j/2.x/log4j-api/apidocs/org/apache/logging/log4j/Level.html>
> 
> Java's official logging level definition is a little bit different, but
> they also support ALL, OFF:
> 
> https://docs.oracle.com/javase/7/docs/api/java/util/logging/Level.html
> <https://docs.oracle.com/javase/7/docs/api/java/util/logging/Level.html>
> 
> So, in my humble opinion, to make the dynamic logging level change
> feature more complete, slf4j-api is much better to support ALL and OFF
> levels. What do you think?
> 
> If you agree and open an issue, I am willing to contribute.
> 
> Best,
> Dongjin
> 
> --
> 
> Dongjin Lee
> 
> A hitchhiker in the mathematical world.
> 
> github: github.com/dongjinleekr <http://github.com/dongjinleekr>
> keybase: https://keybase.io/dongjinleekr <https://keybase.io/dongjinleekr>
> linkedin: kr.linkedin.com/in/dongjinleekr
> <http://kr.linkedin.com/in/dongjinleekr>
> speakerdeck: speakerdeck.com/dongjin <http://speakerdeck.com/dongjin>
> //
> 
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