John,
Thanks for the pointer. Neat idea. One comment though: the approach is intrusive in
the sense that instantiation for objects to be traced at the method level must be
performed by a factory class (or method) not by a constructor. This is a
non-negligible restriction.. Can it be circumvented? Thanks again, Ceki
At 09:34 22.03.2001 -0500, you wrote:
>Alex,
>
>I don't beleive that there is anything like this built into Log4j. You can
>fairly easily do it yourself though. Rather than describe it here I'll just
>point to in the right direction.
>
>Take a look at the Proxy & InvokationHandler classes. NOTE: This is only
>available with JDK 1.3 I believe. If you've followed a factory pattern this
>is easy to implement. If not (if you just go and "new FooBarClass()"
>directly you'll have more work to do.
>
>Hmm, there was an article that described this, wait a minute... Okay: the
>article's name is "Friction Free Debuging with Proxies" it at:
>http://www.java-pro.com/upload/free/features/javapro/2000/11nov00/jm0011/jm0
>011.asp
>
>It doen't use Log4j, but it's easy enough to alter. Take your time and read
>it, it's not too difficult to follow. There are some caveats to using it
>('this' pointer related) but nothing dreadful. (Except performance!)
>
>
>Hope this helps
>
>John Volkar
>Senior Software Engineer II
>E-Transport, a division of Descartes (DSGX)
>[EMAIL PROTECTED]
>
>
>-----Original Message-----
>From: Alex Colic [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, March 22, 2001 9:18 AM
>To: [EMAIL PROTECTED]
>Subject: wrapper for Log4j for method entrance/exit?
>
>
>Hi,
>
>I am adding more debugging to my app. As my program runs I would like to
>print to a file as it enters methods and exits them. I know that at the
>beginning of the method and at the end I could do something like
>
>log("Entered method: MyMethod()");
>
>but that would be tedious.
>
>Is there some time of wrapper class that I could pass the class to in a
>constructor that as methods in the class are called, logging occurs?
>
>Thanks for any help.
>
>Alex
>
>
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I hope to see you at my ApacheCon 2001 presentation
entitled "Log4j, A Logging Package for Java".
See http://ApacheCon.Com/2001/US/ for more details.
----
Ceki Gülcü Web: http://qos.ch
av. de Rumine 5 email: [EMAIL PROTECTED] (preferred)
CH-1005 Lausanne [EMAIL PROTECTED]
Switzerland Tel: ++41 21 351 23 15
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