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" explicitely.
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.
If the caller wants to import these 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 );
COPYRIGHT AND LICENSE¶
Copyright 2002-2009 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.