Welcome to the Log::Log4perl recipe of the week. Today:
My application is already logging to a file. How
can I duplicate all messages to also go to the
screen?
Assuming that you already have a Log4perl
configuration file like
log4perl.logger = DEBUG, FileApp
log4perl.appender.FileApp = Log::Dispatch::File
log4perl.appender.FileApp.filename = test.log
log4perl.appender.FileApp.layout = PatternLayout
log4perl.appender.FileApp.layout.ConversionPattern = %d> %m%n
and log statements all over your code, it's very
easy with Log4perl to have the same messages
both printed to the logfile and the screen. No
reason to change your code, of course, just add
another appender to the configuration file and
you're done:
log4perl.logger = DEBUG, FileApp, ScreenApp
log4perl.appender.FileApp = Log::Dispatch::File
log4perl.appender.FileApp.filename = test.log
log4perl.appender.FileApp.layout = PatternLayout
log4perl.appender.FileApp.layout.ConversionPattern = %d> %m%n
log4perl.appender.ScreenApp = Log::Dispatch::Screen
log4perl.appender.ScreenApp.stderr = 0
log4perl.appender.ScreenApp.layout = PatternLayout
log4perl.appender.ScreenApp.layout.ConversionPattern = %d> %m%n
The configuration file above is assuming that
both appenders are active in the same logger
hierarchy, in this case the "root" category. But
even if you've got file loggers defined in
several parts of your system, belonging to
different logger categories, each logging to
different files, you can gobble up all logged
messages by defining a root logger with a screen
appender, which would duplicate messages from all
your file loggers to the screen due to Log4perl's
appender inheritance. Check
http://www.perl.com/pub/a/2002/09/11/log4perl.html
for details. Have fun!
--
-- Mike
############################
# Mike Schilli #
# log...@pe... #
# http://perlmeister.com #
# log4perl.sourceforge.net #
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