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List:       avalon-dev
Subject:    Re: Logging change for Avalon Framework
From:       Berin Loritsch <bloritsch () apache ! org>
Date:       2001-10-31 18:58:11
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Stephen McConnell wrote:
> 
> Berin:
> 
> Have just tried building the current Avalon cvs (without the Log4J jar).
> Even through the build file declares that the Log4J logger source should be
> excluded if log4j is not present, it's still compiled and generating errors
> (because of the absence of the Log4J classes) - I guess its a problem with
> the "available" statement for "log4j.present" - can you confirm.

Try current CVS now.  It is working in my environment.

> 
> Steve.
> 
> > -----Original Message-----
> > From: Berin Loritsch [mailto:bloritsch@apache.org]
> > Sent: Wednesday, 31 October, 2001 17:15
> > To: cocoon-dev@xml.apache.org; avalon-dev@jakarta.apache.org
> > Subject: Logging change for Avalon Framework
> > 
> > 
> > The Avalon folks realized that forcing users of Avalon to use
> > LogKit was not necessarily a good thing.  Several projects want
> > to use Log4J, and others will want to use JDK 1.4 logging.
> > 
> > You are in luck!  The current CVS version of Avalon has a new
> > interface that abstracts away the implementation of the Logger
> > you are using.  This allows you to keep the same API, and switch
> > logging implementations whenever you feel like it.  One of the
> > benefits is that your code will never have to be rewritten
> > again.
> > 
> > The Avalon team has deprecated the method that is LogKit specific,
> > and introduced a new method that uses the new Logger interface.
> > There are two wrappers: 1 for LogKit, and 1 for Log4J.
> > 
> > If you have extended AbstractLoggable for your components, there
> > is nothing else that needs to be done.
> > 
> > However, if you have to handle the Logger class explicitly, then
> > all you have to do is import the
> > org.apache.avalon.framework.logger.Logger interface instead.
> > 
> > Several people are deeply in favor of such an API change, even if
> > it breaks backwards compatibility.  We strove to minimize the
> > impact as much as possible.  The new Logger interface matches
> > the old LogKit Logger interface, and AbstractLoggable automatically
> > takes care of the transition for you.  No method names need to
> > change.
> > 
> > I would very much like to have some feedback on how much affect
> > it has on any of your projects before we release the new version
> > of Framework.  I have verified that the change does not affect
> > Avalon Excalibur at all.  Everyone that is responsible for their
> > projects, I kindly ask that you get a fresh CVS of Avalon Framework,
> > and test for yourselves.  There might be some impact to some of
> > Cocoon's classes.
> > 
> > Please let me know ASAP.  If there are no issues, then I can
> > get busy preparing a new release of Avalon Framework.  If the impact
> > is much worse than anticipated I need to know.  That way I can back
> > out the changes or add a different Loggable equivalent interface
> > that uses the new Logger interface.
> > 
> > If all goes well, there should be little to no impact on your
> > projects.
> > 
> > --
> > 
> > "Those who would trade liberty for
> > temporary security deserve neither"
> > - Benjamin Franklin
> > 
> > --
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"Those who would trade liberty for
 temporary security deserve neither"
                - Benjamin Franklin

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