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MAN page from RedHat EL 8 perl-Log-Log4perl-1.50-1.el8.noarch.rpm

Filter::Boolean

Section: User Contributed Perl Documentation (3)
Updated: 2020-07-22
Index 

NAME

Log::Log4perl::Filter::Boolean - Special filter to combine the results of others 

SYNOPSIS

    log4perl.logger = WARN, AppWarn, AppError    log4perl.filter.Match1       = sub { /let this through/ }    log4perl.filter.Match2       = sub { /and that, too/ }    log4perl.filter.MyBoolean       = Log::Log4perl::Filter::Boolean    log4perl.filter.MyBoolean.logic = Match1 || Match2    log4perl.appender.Screen        = Log::Dispatch::Screen    log4perl.appender.Screen.Filter = MyBoolean    log4perl.appender.Screen.layout = Log::Log4perl::Layout::SimpleLayout
 

DESCRIPTION

Sometimes, it's useful to combine the output of various filters toarrive at a log/no log decision. While Log4j, Log4perl's mother ship,chose to implement this feature as a filter chain, similar to Linux' IP chains,Log4perl tries a different approach.

Typically, filter results will not need to be passed along in chains but combined in a programmatic manner using boolean logic. ``Log ifthis filter says 'yes' and that filter says 'no''' is a fairly common requirement but hard to implement as a chain.

"Log::Log4perl::Filter::Boolean" is a special predefined custom filterfor Log4perl which combines the results of other custom filters in arbitrary ways, using boolean expressions:

    log4perl.logger = WARN, AppWarn, AppError    log4perl.filter.Match1       = sub { /let this through/ }    log4perl.filter.Match2       = sub { /and that, too/ }    log4perl.filter.MyBoolean       = Log::Log4perl::Filter::Boolean    log4perl.filter.MyBoolean.logic = Match1 || Match2    log4perl.appender.Screen        = Log::Dispatch::Screen    log4perl.appender.Screen.Filter = MyBoolean    log4perl.appender.Screen.layout = Log::Log4perl::Layout::SimpleLayout

"Log::Log4perl::Filter::Boolean"'s boolean expressions allow for combiningdifferent appenders by name using AND (&& or &), OR (|| or |) and NOT (!) aslogical expressions. Parentheses are used for grouping. Precedence followsstandard Perl. Here's a bunch of examples:

    Match1 && !Match2            # Match1 and not Match2    !(Match1 || Match2)          # Neither Match1 nor Match2    (Match1 && Match2) || Match3 # Both Match1 and Match2 or Match3
 

SEE ALSO

Log::Log4perl::Filter,Log::Log4perl::Filter::LevelMatch,Log::Log4perl::Filter::LevelRange,Log::Log4perl::Filter::MDC,Log::Log4perl::Filter::StringRange 

LICENSE

Copyright 2002-2013 by Mike Schilli <m@perlmeister.com> and Kevin Goess <cpanAATTgoess.org>.

This library is free software; you can redistribute it and/or modifyit 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-develAATTlists.sourceforge.net

Authors (please contact them via the list above, not directly):Mike Schilli <m@perlmeister.com>,Kevin Goess <cpanAATTgoess.org>

Contributors (in alphabetical order):Ateeq Altaf, Cory Bennett, Jens Berthold, Jeremy Bopp, HuttonDavidson, Chris R. Donnelly, Matisse Enzer, Hugh Esco, AnthonyFoiani, James FitzGibbon, Carl Franks, Dennis Gregorovic, AndyGrundman, 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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
LICENSE
AUTHOR

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