I know this is a fairly common request, and I have read the log4j short
(free) manual, FAQs, and searched this mailing list's archives for the last
few months and haven't found the definitive answer to this question yet:
I run a custom-written server that serves clients, each session lasting up
to several days. (Think of it as an instant messenger, although it does
more). I currently use my own (custom) logging code to have one logfile per
client. I've converted everything else over to log4j, and I'd like to use
log4j for this too. Currently, I'm using the following code, which seems to
work:
private void setLogfile(String filename) {
// create one log file for this client
logger = Logger.getLogger("users." + filename);
appender = new FileAppender(new org.apache.log4j.PatternLayout("[%d %-5p
%x] - %m%n"), filename+"2", true);
appender.setName(filename); // note: appender is a member
variable
logger.addAppender(appender);
logger.info("Starting logfile: "+filename);
}
and when the client's session ends, I do:
logger.removeAllAppenders();
appender.close();
Is this a decent way to handle this, or is there a cleaner way, perhaps
using MDC or NDC? The log4j FAQ or manual hints that there is a way to do
it, but I can't find it anywhere. Thanks for your comments, and thanks to
the log4j team for a great piece of work!
Chris Lamprecht
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