[logback-dev] Replacing CallerData class

[Joern Huxhorn]

On 18.03.2009, at 17:35, Ceki Gulcu wrote:

> Joern Huxhorn wrote:
>
>> Extending StackTraceElement won't work because STE is a final class.
>
> Good point.
>
>> Why don't you simply use StackTraceElementProxy  instead of STE?  
>> That way, it could - optionally - also contain ClassPackagingData.
>
> As it stands, CallerData is almost identical to the StackTraceElement
> class. I don't expect CallerData to ever contain ClassPackagingData
> because collecting class packaging data is an extremely expensive
> operation, barely tolerable for exceptions but certainly not for every
> log statement.  I would be quite surprised if we ever wanted to
> replace CallerData/STE with STEProxy.

Well, I agree with your performance argument but the CPD field of  
STEProxy doesn't need to be used in the common case.

I'd use STEProxy simply to keep the possibility to activate such info  
on demand, i.e. while debugging but not in production.
It could certainly come in quite handy under some circumstances, e.g.  
while walking the path of jar hell.

Joern.