Hi Alan,
On Wed, Sep 11, 2002 at 04:21:21PM +0000, Alan Hodgkinson wrote:
>
> Can someone give me a hint on how to implement Cocoon logging
> in Java classes that don't extend from the 'Abstract{Cocoon}
> classes (I.e. AbstractAction, AbstractReader, etc.)?
>
> For example, how would I implement logging in a really simple
> Java Bean, that otherwise wouldn't have to know anything about
> cocoon?
Is this class to be used from within Cocoon, or is it a completely
separate application ?
If it's within Cocoon, read on, if not, then have a look at the
logkit examples on jakarta.apache.org.
> I had hoped that I could 'extend AbstractLogEnabled' and 'implement
> LogEnabled' in my class. I've searched for clues in all the
> examples, but they always extend some Cocoon-specific class (that
> magically make the logging work).
>
> My code is roughly the following:
>
> import org.apache.avalon.framework.logger.AbstractLogEnabled;
> import org.apache.avalon.framework.logger.LogEnabled;
> import org.apache.avalon.framework.logger.Logger;
>
> public class MyClass
> extends AbstractLogEnabled
> implements LogEnabled
> {
> private Logger logger;
> public void enableLogging(Logger logger) {
> this.logger = logger;
> }
you don't need this method and variable if you extend from
AbstractLogEnabled, as they are already provided for you in the
AbstractLogEnabled class.
> public void myMethod() {
> getLogger().debug( "msg.." ); // <-- getLogger() returns null!
> }
> }
>
> The problem is that getLogger() always returns null. I suspect
> that I need to implement some other interface too.
Yes, getLogger() returns null if logging hasn't been enabled on
that object. :)
LogEnabled is actually an Avalon Component lifecycle stage and the
method enableLogging() is automatically invoked on components that
implement this interface by the Avalon component manager (thats the
magic part you're referring to).
That may sound confusing if you've never heard of Avalon before :)
so if you're not writing a Component, and simply want to do some
logging in your object from within your Cocoon application, call
the enableLogging() method on your object (defined in
AbstractLogEnabled) and pass into it a Logger object retrieved
from Cocoon somewhere (ie. sitemap component, logkit manager, etc).
Hope that helps.
Cheers,
Marcus
--
.....
,,$$$$$$$$$, Marcus Crafter
;$' '$$$$: Computer Systems Engineer
$: $$$$: ManageSoft GmbH
$ o_)$$$: 82-84 Mainzer Landstrasse
;$, _/\ &&:' 60327 Frankfurt Germany
' /( &&&
\_&&&&'
&&&&.
&&&&&&&:
---------------------------------------------------------------------
Please check that your question has not already been answered in the
FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
To unsubscribe, e-mail: <[EMAIL PROTECTED]>
For additional commands, e-mail: <[EMAIL PROTECTED]>
