Re: Circular Dependency through Appender

Thanks Michael,

As I've implemented lot of logging in this component, I didn't feel like
wiping out all the nice logging just because of that circular dependency...

So I decided to ignore all settings from the log4j configuration file and
create a very specific Logger instance, programmatically.

Created a factory method which gives me a Logger instance, independent of
the root Logger, and has just one appender -- the ConsoleAppender.

*Instead of using *

private static Logger log = Logger.getLogger(MyClass.class);

*I use...*

private static Logger log = LoggingRescue.loggerFactory(MyClass.class);

*Fragment of the factory method...*

    public static Logger loggerFactory(Class clazz)
    {
        /** The new Logger */
        Logger log = null;

        // Gets the logger for the class
        log = Logger.getLogger(clazz);
        log.removeAllAppenders();
...
        /*
         * Creates the console appender
         */
        Layout consoleLayout = new PatternLayout(CONSOLE_LAYOUT);
        Appender dspConsoleAppender = new ConsoleAppender(consoleLayout);
        dspConsoleAppender.setName(CONSOLE_APPENDER_NAME);

        log.addAppender(dspConsoleAppender);
        log.setAdditivity(false);
        log.setLevel(level);

...
        return log;
    }

Thanks,
Ivan Z. Alencar.

On Thu, Jul 17, 2008 at 6:12 AM, Michael Erskine <michael.erskine <at> ketech.com>
wrote:

> Ivan Alencar [mailto:ialencar <at> gmail.com] wrote:
> > I've created a log4j appender (by extending AppenderSkeleton) which uses
> a
> > component that depends on log4j.
>
> If you can change the component then one technique I sometimes use is to
> pass in a Logger object which may be null. Or I suppose one could
> temporarily set the static logger for that class to null while I'm accessing
> it from an Appender. You can always programmatically disable the Logger for
> the component's class too with Logger.getLogger(whatever).setLevel()
>
> Typically I try to write components that don't rely on any particular
> logging framework at runtime - keep it optional.
>
> Regards,
> Michael Erskine.
>
>
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Ivan Zilotti Alencar
347-920-1226 (mobile)
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ialencar <at> gmail.com
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