We wrote a base class which all the data classes extend. Among other things it implements a reflection-based toString() that properly interrogates superclasses and permits Modifier-based filtering. If anyone is interested I can see if it would be permissible for me to post it.
Jim Cakalic > -----Original Message----- > From: Benson Chen [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, December 18, 2001 12:39 PM > To: Log4J Developers List > Subject: Re: automatic trace insertion > > > Vincent, > > Yup, I don't doubt that that's the way to do it.... nice > clean separation of > logic and data. In order to make sense of the trace, > everyone has to make > sure that the toString() method is implemented for each data > object. Actually > this leads to another question (which might need another > thread)... does > anyone know of some code that automatically creates > toString() methods? > Possibly using reflection to get instance variables and fills in the > toString() method for you. As you can see, I'm a proponent > of any form of > automation... maybe because I'm lazy. :-) -Benson > > Vincent Massol wrote: > > > In our case, the data objects are just that ... data objects. These > > objects are manipulated by business methods (they are passed as > > parameters or returned). As you can seem, the AspectJ code I have > > provided does log all the parameters using the toString() > representation > > of an object. So each of our object has a printable toString method. > > > > -Vincent > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On > Behalf Of Benson > > Chen > > > Sent: 18 December 2001 17:15 > > > To: Log4J Developers List > > > Subject: Re: automatic trace insertion > > > > > > Well sometimes logging those setter methods are just as important > > because > > > you > > > want to know as you trace through your code that some > object's state > > has > > > been > > > modified. As to solve the volume problem, I wouldn't > enable logging > > to > > > your > > > whole system all at once unless of course you are doing system > > testing. > > > The > > > beauty of log4j is that you can have all sorts of > categories (one for > > each > > > class) to allow you to enable or disable traces depending > on what you > > are > > > interested in and the amount of volume you want to deal with. > > > Actually, one thing I was thinking about was having some sort of > > > intelligent > > > trace enablement where all traces are disabled by default but if a > > > RuntimeException is thrown, you have code that goes > through the stack > > > trace > > > and enables trace logs for classes/methods leading up to the > > exception. > > > This > > > way when you run your system again, you'll have logs tailored to > > watching > > > exactly what events occurred before your system blew up. > > > Again, I'm not dictating how you should use log4j, but I > would think > > that > > > being able to easily get at more information is always best. But > > using > > > log4j > > > in any capacity is better than none at all. :-) -Benson > > > > > > Vincent Massol wrote: > > > > > > > You are right, Paul, it is important not to log > everything, as logs > > tend > > > > to grow big very quickly and performance suffer a lot. > In my project > > we > > > > use AspectJ to log entries and exits with the following rules : > > > > > > > > - public methods that accept at least one parameter (static and > > > > non-static), > > > > - exclude the data object packages (we have all our > data objects - > > > > setter/getter objects - located in a package) > > > > > > > > These rules seem to strike a good balance (at least for > us). Then, > > we > > > > use the log4j configuration to turn on/off logging for specific > > > > categories. > > > > > > > > -Vincent > > > > > > > > > -----Original Message----- > > > > > From: Paul Glezen [mailto:[EMAIL PROTECTED]] > > > > > Sent: 18 December 2001 15:07 > > > > > To: Log4J Developers List > > > > > Subject: RE: automatic trace insertion > > > > > > > > > > Scott brings up an important point. Do you really > want to trace > > every > > > > > method? Even simple getters/setters? Not only will > there be a > > > > > performance > > > > > penalty (acceptable in some circumstances), it would > also create > > more > > > > > volume than you might want. > > > > > > > > > > Paul Glezen > > > > > Consulting IT Specialist > > > > > IBM Software Services for WebSphere > > > > > 818 539 3321 > > > > > > > > > > > > > > > Scott Coleman <[EMAIL PROTECTED]> on > 12/18/2001 06:57:50 > > AM > > > > > > > > > > Please respond to "Log4J Developers List" > > > > <[EMAIL PROTECTED]> > > > > > > > > > > To: "'Log4J Developers List'" <[EMAIL PROTECTED]> > > > > > cc: > > > > > Subject: RE: automatic trace insertion > > > > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > > I have not read the whole article yet, but I think > you will get a > > > > heavy > > > > > performance penalty if you use JPDA. > > > > > Can someone please explain to me why you would want > to log both > > entry > > > > and > > > > > exit calls, for such a thin layer in the code. I > thought that it > > was > > > > meant > > > > > to be very fast. So why would you want to add the performance > > overhead > > > > of > > > > > logging entry and exit information. If you were to go > down this > > path > > > > would > > > > > it not be better to use jdk 1.4's new assert feature ? > > > > > > > > > > Regards > > > > > Scott > > > > > > > > > > -----Original Message----- > > > > > From: Cakalic, James [mailto:[EMAIL PROTECTED]] > > > > > Sent: Monday, December 17, 2001 11:37 PM > > > > > To: 'Log4J Developers List' > > > > > Subject: RE: automatic trace insertion > > > > > > > > > > > > > > > This article about Jylog -- a JPDA based logging > generator -- just > > > > > appeared > > > > > on JavaWorld. Perhaps it relevant? > > > > > > > http://www.javaworld.com/javaworld/jw-12-2001/jw-1214-jylog.html > > > > > > > > > > Jim > > > > > > > > > > > -----Original Message----- > > > > > > From: Paul Glezen [mailto:[EMAIL PROTECTED]] > > > > > > Sent: Monday, December 17, 2001 4:25 PM > > > > > > To: Log4J Developers List > > > > > > Subject: Re: automatic trace insertion > > > > > > > > > > > > > > > > > > Hi Benson, > > > > > > > > > > > > It's not as easy as it looks to do "intelligently". > While it is > > > > often > > > > > > taught that methods should have a single entry > point and exit > > > > > > point, not > > > > > > many programmers adhear to this. It is not at all uncommon > > > > > > to find return > > > > > > statements in if-blocks and try-catch blocks. Sometimes the > > > > > > exit logic can > > > > > > get very convoluted. > > > > > > > > > > > > I've always been partial to single exit logic. I didn't > > > > > > become a fan until > > > > > > trying to insert trace statements, just as you describe, in > > > > > > other people's > > > > > > code. It can be a nightmare. > > > > > > > > > > > > - Paul > > > > > > > > > > > > Paul Glezen > > > > > > Consulting IT Specialist > > > > > > IBM Software Services for WebSphere > > > > > > 818 539 3321 > > > > > > > > > > > > > > > > > > Benson Chen <[EMAIL PROTECTED]>@porivo.com on 12/17/2001 > > 01:57:15 PM > > > > > > > > > > > > Please respond to "Log4J Developers List" > > > > > > <[EMAIL PROTECTED]> > > > > > > > > > > > > Sent by: [EMAIL PROTECTED] > > > > > > > > > > > > > > > > > > To: [EMAIL PROTECTED] > > > > > > cc: > > > > > > Subject: automatic trace insertion > > > > > > > > > > > > > > > > > > > > > > > > Hi all, > > > > > > > > > > > > I'm interested in automatically inserting log4j trace > > > > > > statements at the > > > > > > beginning of all methods and right before the end > of a method > > > > (return > > > > > > statement or thrown exception). I'm presuming most > people have > > > > worked > > > > > > on projects with extensive class libraries and it > would be great > > if > > > > > > there was a class parser that could intelligently > insert log4j > > > > > > statements automatically. If there isn't anything out there > > > > > > like that, > > > > > > does anyone know of a java class parser that can be used to > > > > > > do this sort > > > > > > of thing? Thoughts or ideas? Thanks! > > > > > > > > > > > > -- > > > > > > Benson Chen > > > > > > Director of Software Engineering > > > > > > Porivo Technologies, Inc. > > > > > > Phone: (919)806-0566x12 > > > > > > E-Mail: [EMAIL PROTECTED] > > > > > > "Measuring end-to-end Web performance" > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > To unsubscribe, e-mail: > > > > > > <mailto:[EMAIL PROTECTED]> > > > > > > For additional commands, e-mail: > > > > > > <mailto:[EMAIL PROTECTED]> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > To unsubscribe, e-mail: > > > > > > <mailto:[EMAIL PROTECTED]> > > > > > > For additional commands, e-mail: > > > > > > <mailto:[EMAIL PROTECTED]> > > > > > > > > > > > > > > > > > > > > > <font size="1">Confidentiality Warning: This e-mail contains > > > > information > > > > > intended only for the use of the individual or entity > named above. > > If > > > > the > > > > > reader of this e-mail is not the intended recipient or the > > employee or > > > > > agent > > > > > responsible for delivering it to the intended recipient, any > > > > > dissemination, > > > > > publication or copying of this e-mail is strictly > prohibited. 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