Log::Log4perl::Config::BaseConfigurator - Configurator Base Class
This is a virtual base class, all configurators should be derived from it.
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.
file
SomeConfigParser
url => 'http://foobar'
parse()
The base class accepts a filename or a reference to an array of text lines:
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.
text()
parse
Virtual method, needs to be defined by the derived class.
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.
category
appender
The log4perl. prefix (e.g. as used in the PropertyConfigurator class) is stripped, it's not part in the HoH structure.
log4perl.
Each Log4perl config value is indicated by the value key, as in
value
$data->{category}->{Bar}->{Twix}->{value} = "WARN, Logfile"
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.
eg/yamlparser
Log::Log4perl::Config::PropertyConfigurator
Log::Log4perl::Config::DOMConfigurator
Log::Log4perl::Config::LDAPConfigurator (tbd!)
Mike Schilli, <m@perlmeister.com>, 2004 Kevin Goess, <cpan@goess.org> Jan-2003
To install Log::Log4perl, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Log::Log4perl
CPAN shell
perl -MCPAN -e shell install Log::Log4perl
For more information on module installation, please visit the detailed CPAN module installation guide.