On Wednesday, Aug 13, 2003, at 17:33 Europe/London, Gareth Bryan wrote:
I think runtime swapping of log levels is a very powerful feature: we should have this feature if it is at all feasible.
Also:
I have written loggers in the past which fail **very** quickly if a
particular level is not enabled. The logger implementation uses a
delegate mechanism whereby when setLogLevel() is called (ie during init),
any log levels which are not operational have their request mapped
through to a NullLogger. Thus the only overhead of calling a log method
for a level which is not enabled is the method location + stack overhead.
Don't forget that any argument will still be evaluated prior to that logging call. That's why some of the earliest oggers used methods that took an array of Object expressions, and then only ran the string contat stuff if the logging was enabled.
A NullLogger would work very quickly, but you'd still need to catch out for all those expression evaluations prior to the log message being ignored.
Alex
