Config::BaseConfigurator(3pm) | User Contributed Perl Documentation | Config::BaseConfigurator(3pm) |
NAME¶
Log::Log4perl::Config::BaseConfigurator - Configurator Base Class
SYNOPSIS¶
This is a virtual base class, all configurators should be derived from it.
DESCRIPTION¶
METHODS¶
- "new"
- Constructor, typically called like
my $config_parser = SomeConfigParser->new( file => $file, ); my $data = $config_parser->parse();
Instead of "file", the derived class "SomeConfigParser" may define any type of configuration input medium (e.g. "url => 'http://foobar'"). It just has to make sure its "parse()" method will later pull the input data from the medium specified.
The base class accepts a filename or a reference to an array of text lines:
- "file"
- Specifies a file which the "parse()" method later parses.
- "text"
- Specifies a reference to an array of scalars, representing configuration
records (typically lines of a file). Also accepts a simple scalar, which
it splits at its newlines and transforms it into an array:
my $config_parser = MyYAMLParser->new( text => ['foo: bar', 'baz: bam', ], ); my $data = $config_parser->parse();
If either "file" or "text" parameters have been specified in the constructor call, a later call to the configurator's "text()" method will return a reference to an array of configuration text lines. This will typically be used by the "parse()" method to process the input.
- "parse"
- Virtual method, needs to be defined by the derived class.
Parser requirements¶
- If the parser provides variable substitution functionality, it has to implement it.
- The parser's "parse()" method returns a reference to a hash of hashes (HoH). The top-most hash contains the top-level keywords ("category", "appender") as keys, associated with values which are references to more deeply nested hashes.
- The "log4perl." prefix (e.g. as used in the PropertyConfigurator class) is stripped, it's not part in the HoH structure.
- Each Log4perl config value is indicated by the
"value" key, as in
$data->{category}->{Bar}->{Twix}->{value} = "WARN, Logfile"
EXAMPLES¶
The following Log::Log4perl configuration:
log4perl.category.Bar.Twix = WARN, Screen log4perl.appender.Screen = Log::Log4perl::Appender::File log4perl.appender.Screen.filename = test.log log4perl.appender.Screen.layout = Log::Log4perl::Layout::SimpleLayout
needs to be transformed by the parser's "parse()" method into this data structure:
{ appender => { Screen => { layout => { value => "Log::Log4perl::Layout::SimpleLayout" }, value => "Log::Log4perl::Appender::Screen", }, }, category => { Bar => { Twix => { value => "WARN, Screen" } } } }
For a full-fledged example, check out the sample YAML parser implementation in "eg/yamlparser". It uses a simple YAML syntax to specify the Log4perl configuration to illustrate the concept.
SEE ALSO¶
Log::Log4perl::Config::PropertyConfigurator
Log::Log4perl::Config::DOMConfigurator
Log::Log4perl::Config::LDAPConfigurator (tbd!)
LICENSE¶
Copyright 2002-2013 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.
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-devel@lists.sourceforge.net
Authors (please contact them via the list above, not directly): Mike Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>
Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis Gregorovic, Andy Grundman, 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.
2022-10-30 | perl v5.36.0 |