log::log4perl::layout::nooplayout(3) [suse man page]
Layout::NoopLayout(3) User Contributed Perl Documentation Layout::NoopLayout(3)NAME
Log::Log4perl::Layout::NoopLayout - Pass-thru Layout
SYNOPSIS
use Log::Log4perl::Layout::NoopLayout;
my $layout = Log::Log4perl::Layout::NoopLayout->new();
DESCRIPTION
This is a no-op layout, returns the logging message unaltered, useful for implementing the DBI logger.
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.
perl v5.12.1 2010-02-07 Layout::NoopLayout(3)
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Filter::Boolean(3) User Contributed Perl Documentation Filter::Boolean(3)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 to arrive 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 if
this 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 filter for 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 combining different appenders by name using AND (&& or &), OR (|| or |)
and NOT (!) as logical expressions. Parentheses are used for grouping. Precedence follows standard 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::StringRange
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.
perl v5.12.1 2010-02-07 Filter::Boolean(3)
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