SVK::Log::FilterPipeline(3) User Contributed Perl Documentation SVK::Log::FilterPipeline(3)NAME
SVK::Log::FilterPipeline - a pipeline of log filter objects
DESCRIPTION
An SVK::Log::FilterPipeline represents a particular collection of log filter objects each of which needs to be called in turn.
METHODS
new
Construct a new SVK::Log::FilterPipeline object by constructing the specific filters that will handle the details and preparing for the
first revision.
build_filter_object
Given the name of a filter, try and construct an appropriate filter object. Search @INC for modules that match the name given. If no
appropriate classes are available, we die with an appropriate warning.
This method creates an object for the filter by calling its new() method
filter
SVK::Command::Log calls this routine when it wants to display (or process) a revision. The method then dispatches the information to the
methods of the necessary filter objects in the pipeline to perform the real work.
finished
Tell all the filters that their jobs are done by calling "footer" and "teardown" on each one.
get_pipeline_command
Examine an exception to determine if it's a pipeline control exception. If it is, return the desired pipeline command. If it's not,
rethrow the exception. If no exception is provided, the command 'continue' is returned.
present_revision
Display a single revision by passing it to the pipeline's presentation filter.
run_pipeline
Send a revision down the pipeline. Provide revision information to the revision() method of each filter in the pipeline until one of them
says to stop. Then return the pipeline command.
set_up_presentation
Handle initial set up for the presentation filter. This should only be called once during an SVK::Log::FilterPipeline's lifetime.
set_up_selection
Handle initial set up for the selection filter pipeline. This should only be called once during "SVK::Log::FilterPipeline"'s lifetime.
split_filter
Split a string into a filter name and an arbitrary argument string.
split_selectors
Split the description of the selection filter pipeline into individual filter names and their arguments. Each filter is separated by a '|'
character. Literal pipe characters are included with '|'.
perl v5.10.0 2008-08-04 SVK::Log::FilterPipeline(3)
Check Out this Related Man Page
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)