Hello,
I've been using log4j for some time now and it's working really fine. However i
have trouble with setting the log-levels right.
I am working on a server that gets quite some load.
At first I set the log-level to debug. This was very convenient for, well,
debugging. When the server got heavier load this got impractical because the
log files would inflate and IO caused by logging became noticeable.
So i set the log level to warn. That solved those problems. But now when the
occasional error occurs it has become much harder to figure out why. Before I
had the debug statements from which I could tell, what was wrong. Now i just
have a Exception and a stacktrace, which sometimes just isn't enough
information.
So what I'd really like would be a compromise of these two options. I was
thinking about a possibility to configure a logger so it would add the last X
log
messages of lower levels whenever an log of the "regular" level would be
written.
A Simple example:
public double getAvgAge(List<Person> persons){
LOG.debug("Calulating average age for persons: "+persons);
try{
int total_age = getTotalAge(persons);
double avg_age = total_age / persons.size();
return avg_age;
} catch (Exception e ){
LOG.error("Could not calculate average age");
throw e;
}
}
I'd like to be able to set up log4j so that it doesn't log anyting if the code
works(calls no LOG.error). But when it does call LOG.error i'd like to also see
the previous debug statements in my log so I can figure out why my code failed.
So i would read something like this in my log:
DEBUG AverageAgeCalculator: Calulating average age for persons: [ ]
ERROR AverageAgeCalculator: DivideByZeroError
....stacktrace....
But no unnecessary statements like:
DEBUG AverageAgeCalculator: Calulating average age for persons: [Mary, Peter ]
DEBUG AverageAgeCalculator: Calulating average age for persons: [Carlos, Hans,
Klaus]
I happen to have some free time on my hands so i'd like to try to code this
myself.
But before i start thinking about implementation, I would like to know some
things.
Does something like this already exist?
Do you think this would be useful?
Greetings, Carlos Freund
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