Allow for configuration of trace logging messages

[craigwilliams84]

Currently the log messages for entering and exiting methods are fixed, but we should add the ability to specify the messages via properties.

After comments from @sirsir, we should also allow a different message to be configured when a traced method throws an exception.

[sinsir]

Are we going to allow user to configure Advices ?

i.e

After throwing advice: Advice to be executed if a method exits by throwing an exception.
After (finally) advice: Advice to be executed regardless of the means by which a join point exits (normal or exceptional return).

[craigwilliams84]

I'm not sure we would need to allow users to configure advices directly as we're only concerned with logging entry and exit from methods. I do think it would be useful to allow a different message to be displayed when an exception is thrown though and this does seem to be supported within the CustomizableTraceInterceptor that we use (which i believe uses an Around advice under the covers).

[sinsir]

I guess that was what I was trying to say - should we allow user to log something other than straight entry and exit ?

[craigwilliams84]

We should definitely do the throwing case that you described but the finally advice will be more difficult to implement as the CustomizableTraceInterceptor doesn't support this (as far as I know), and I'm not sure it adds enough in the way of functionality to make it worthwhile. What are peoples thoughts?

[rhart]

I think if we're going to do finally then the right way is to add the capability to CustomizableTraceInterceptor first. There may even already by an issue.