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Moose::Cookbook::Extending::Recipe2.3pm
Langue: en
Version: 2010-06-11 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
Moose::Cookbook::Extending::Recipe2 - Providing a role for the base object classSYNOPSIS
package MooseX::Debugging; use Moose::Exporter; Moose::Exporter->setup_import_methods( base_class_roles => ['MooseX::Debugging::Role::Object'], ); package MooseX::Debugging::Role::Object; use Moose::Role; after 'BUILDALL' => sub { my $self = shift; warn "Made a new " . ( ref $self ) . " object\n"; };
DESCRIPTION
In this example, we provide a role for the base object class that adds some simple debugging output. Every time an object is created, it spits out a warning saying what type of object it was.Obviously, a real debugging role would do something more interesting, but this recipe is all about how we apply that role.
In this case, with the combination of Moose::Exporter and Moose::Util::MetaRole, we ensure that when a module does "use MooseX::Debugging", it automatically gets the debugging role applied to its base object class.
There are a few pieces of code worth looking at more closely.
Moose::Exporter->setup_import_methods( base_class_roles => ['MooseX::Debugging::Role::Object'], );
This creates an "import" method in the "MooseX::Debugging" package. Since we are not actually exporting anything, we do not pass "setup_import_methods" any parameters related to exports, but we need to have an "import" method to ensure that our "init_meta" method is called. The "init_meta" is created by "setup_import_methods" for us, since we passed the "base_class_roles" parameter. The generated "init_meta" will in turn call Moose::Util::MetaRole::apply_base_class_roles.
AUTHOR
Dave Rolsky <autarch@urth.org>COPYRIGHT AND LICENSE
Copyright 2009 by Infinity Interactive, Inc.<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre