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Mike Schilli


Log::Log4perl::Level - Predefined log levels


  use Log::Log4perl::Level;
  print $ERROR, "\n";

  # -- or --

  use Log::Log4perl qw(:levels);
  print $ERROR, "\n";


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:


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 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.