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Re: Question about loggers

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On 3/7/2012 1:52 PM, Novice wrote:
> My impression from the "Aspect Questions" thread was that the "best
> practices" approach to logging was to use named loggers, where, in essence,
> each method that needs to write to the log creates a named logger via
>
> Logger logger = Logger.getLogger(getClass().getName());


I could see an app that was divided into functional parts, like maybe 
"DATABASE" and "GUI", etc. where the logging was specified to use those 
names:

   Logger log = Logger.getLogger( "GUI" );

But while I could see this, I've never actually heard of anyone 
specifying it.  Loggers by class name is all I've ever seen.

>
> Also, Stelting mentions that you can use the LogManager to "cache Logger
> objects for repeat use". What circumstances would justify using LogManager?
> I was under the impression that simply doing Logger.getLogger() was
> perfectly adequate for a professional quality program. Why would LogManager
> be any better than simply making the logger a class variable?


I think I've done this, exactly once in my life:

public class MyLogger extends Logger {
   ...
}

...
   MyLogger log = new MyLogger();
   LogManager.getLogManager().addLogger( log );

If you go through the Logger.getLogger( name ) method this is done for 
you.  If you make your own logger for some reason, you can still use the 
LogManger to cache it.


> Then, I wrote a version using a named logger and a single class variable
> and the whole thing looks a lot simpler and cleaner:


It's kind of six of one and half dozen of another.  Do what makes you 
happiest.  But assume any given shop might have different ideas what is 
best, and be prepared to adjust.

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Thread

Question about loggers Novice <novice@example..com> - 2012-03-07 21:52 +0000
  Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-07 17:16 -0500
    Re: Question about loggers Novice <novice@example..com> - 2012-03-07 23:57 +0000
      Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-07 19:24 -0500
        Re: Question about loggers Lew <noone@lewscanon.com> - 2012-03-08 07:22 -0800
          Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-08 10:27 -0500
            Re: Question about loggers Lew <lewbloch@gmail.com> - 2012-03-08 11:58 -0800
              Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-08 15:49 -0500
          Re: Question about loggers Robert Klemme <shortcutter@googlemail.com> - 2012-03-08 08:15 -0800
            Re: Question about loggers markspace <-@.> - 2012-03-08 10:05 -0800
              Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-08 13:50 -0500
              Re: Question about loggers Robert Klemme <shortcutter@googlemail.com> - 2012-03-09 07:11 -0800
                Re: Question about loggers Lew <noone@lewscanon.com> - 2012-03-09 07:45 -0800
                Re: Question about loggers markspace <-@.> - 2012-03-09 07:54 -0800
                Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-09 11:03 -0500
                Re: Question about loggers markspace <-@.> - 2012-03-09 09:10 -0800
                Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-09 12:27 -0500
                Re: Question about loggers Lew <lewbloch@gmail.com> - 2012-03-09 10:56 -0800
                Re: Question about loggers Robert Klemme <shortcutter@googlemail.com> - 2012-03-09 20:29 +0100
                Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-09 11:04 -0500
                Re: Question about loggers markspace <-@.> - 2012-03-09 09:14 -0800
                Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-09 12:22 -0500
                Re: Question about loggers Lew <lewbloch@gmail.com> - 2012-03-09 10:58 -0800
  Re: Question about loggers markspace <-@.> - 2012-03-07 15:21 -0800
    Re: Question about loggers Novice <novice@example..com> - 2012-03-08 00:01 +0000
    Re: Question about loggers Arne Vajhøj <arne@vajhoej.dk> - 2012-03-07 19:21 -0500
      Re: Question about loggers Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2012-03-08 06:18 -0400

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