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Config::BaseConfiguratUser)Contributed Perl DocumenConfig::BaseConfigurator(3)
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!)
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 v5.14.1 2011-05-02 Config::BaseConfigurator(3)
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