Level(3pm) User Contributed Perl Documentation Level(3pm)
NAME
Log::Log4perl::Level - Predefined log levels
SYNOPSIS
use Log::Log4perl::Level;
print $ERROR, "\n";
# -- or --
use Log::Log4perl qw(:levels);
print $ERROR, "\n";
DESCRIPTION
"Log::Log4perl::Level" simply exports a predefined set of Log4perl log
levels into the caller's name space. It is used internally by
"Log::Log4perl". The following scalars are defined:
$OFF
$FATAL
$ERROR
$WARN
$INFO
$DEBUG
$TRACE
$ALL
"Log::Log4perl" also exports these constants into the caller's
namespace if you pull it in providing the ":levels" tag:
use Log::Log4perl qw(:levels);
This is the preferred way, there's usually no need to call
"Log::Log4perl::Level" explicitly.
The numerical values assigned to these constants are purely virtual,
only used by Log::Log4perl internally and can change at any time, so
please don't make any assumptions. You can test for numerical equality
by directly comparing two level values, that's ok:
if( get_logger()->level() == $DEBUG ) {
print "The logger's level is DEBUG\n";
}
But if you want to figure out which of two levels is more verbose, use
Log4perl's own comparator:
if( Log::Log4perl::Level::isGreaterOrEqual( $level1, $level2 ) ) {
print Log::Log4perl::Level::to_level( $level1 ),
" is equal or more verbose than ",
Log::Log4perl::Level::to_level( $level2 ), "\n";
}
If the caller wants to import level constants into a different
namespace, it can be provided with the "use" command:
use Log::Log4perl::Level qw(MyNameSpace);
After this $MyNameSpace::ERROR, $MyNameSpace::INFO etc. will be
defined accordingly.
Numeric levels and Strings
Level variables like $DEBUG or $WARN have numeric values that are
internal to Log4perl. Transform them to strings that can be used in a
Log4perl configuration file, use the c<to_level()> function provided by
Log::Log4perl::Level:
use Log::Log4perl qw(:easy);
use Log::Log4perl::Level;
# prints "DEBUG"
print Log::Log4perl::Level::to_level( $DEBUG ), "\n";
To perform the reverse transformation, which takes a string like
"DEBUG" and converts it into a constant like $DEBUG, use the
to_priority() function:
use Log::Log4perl qw(:easy);
use Log::Log4perl::Level;
my $numval = Log::Log4perl::Level::to_priority( "DEBUG" );
after which $numval could be used where a numerical value is required:
Log::Log4perl->easy_init( $numval );
LICENSE
Copyright 2002-2013 by Mike Schilli <m@perlmeister.com> and Kevin Goess
<cpan@goess.org>.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
AUTHOR
Please contribute patches to the project on Github:
http://github.com/mschilli/log4perl
Send bug reports or requests for enhancements to the authors via our
MAILING LIST (questions, bug reports, suggestions/patches):
log4perl-devel@lists.sourceforge.net
Authors (please contact them via the list above, not directly): Mike
Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>
Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens
Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse
Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis
Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier David
Hull, Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter,
Brett Rann, Peter Rabbitson, Erik Selberg, Aaron Straup Cope, Lars
Thegler, David Viner, Mac Yang.
perl v5.36.0 2022-10-30 Level(3pm)
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