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> > // > > _______________________________________________ > slf4j-user mailing list > slf4j-user@qos.ch > http://mailman.qos.ch/mailman/listinfo/slf4j-user _______________________________________________ slf4j-user mailing list slf4j-user@qos.ch http://mailman.qos.ch/mailman/listinfo/slf4j-user
