Moose::Manual::MooseX(3pm) User Contributed Perl Documentation Moose::Manual::MooseX(3pm)
NAME
Moose::Manual::MooseX - Recommended Moose extensions
VERSION
version 2.0603
MooseX?
It's easy to extend and change Moose, and this is part of what makes Moose so powerful. You can use the MOP API to do things your own way,
add new features, and generally customize your Moose.
Writing your own extensions does require a good understanding of the meta-model. You can start learning about this with the
Moose::Manual::MOP docs. There are also several extension recipes in the Moose::Cookbook.
Explaining how to write extensions is beyond the scope of this manual. Fortunately, lots of people have already written extensions and put
them on CPAN for you.
This document covers a few of the ones we like best.
MooseX::AttributeHelpers
The functionality of this MooseX module has been moved into Moose core. See Moose::Meta::Attribute::Native.
Moose::Autobox
MooseX::AttributeHelpers, but turned inside out, Moose::Autobox provides methods on both arrays/hashes/etc. but also references to them,
using Moose roles, allowing you do to things like:
use Moose::Autobox;
$somebody_elses_object->orders->push($order);
Lexically scoped and not to everybody's taste, but very handy for sugaring up other people's APIs and your own code.
MooseX::StrictConstructor
By default, Moose lets you pass any old junk into a class's constructor. If you load MooseX::StrictConstructor, your class will throw an
error if it sees something it doesn't recognize;
package User;
use Moose;
use MooseX::StrictConstructor;
has 'name';
has 'email';
User->new( name => 'Bob', emali => 'bob@example.com' );
With MooseX::StrictConstructor, that typo ("emali") will cause a runtime error. With plain old Moose, the "emali" attribute would be
silently ignored.
MooseX::Params::Validate
We have high hopes for the future of MooseX::Method::Signatures and MooseX::Declare. However, these modules, while used regularly in
production by some of the more insane members of the community, are still marked alpha just in case backwards incompatible changes need to
be made.
If you don't want to risk that, for now we recommend the decidedly more clunky (but also faster and simpler) MooseX::Params::Validate. This
module lets you apply Moose types and coercions to any method arguments.
package User;
use Moose;
use MooseX::Params::Validate;
sub login {
my $self = shift;
my ($password)
= validated_list( @_, password => { isa => 'Str', required => 1 } );
...
}
MooseX::Getopt
This is a role which adds a "new_with_options" method to your class. This is a constructor that takes the command line options and uses
them to populate attributes.
This makes writing a command-line application as a module trivially simple:
package App::Foo;
use Moose;
with 'MooseX::Getopt';
has 'input' => (
is => 'ro',
isa => 'Str',
required => 1
);
has 'output' => (
is => 'ro',
isa => 'Str',
required => 1
);
sub run { ... }
Then in the script that gets run we have:
use App::Foo;
App::Foo->new_with_options->run;
From the command line, someone can execute the script:
foo@example> foo --input /path/to/input --output /path/to/output
MooseX::Singleton
To be honest, using a singleton is just a way to have a magic global variable in languages that don't actually have global variables.
In perl, you can just as easily use a global. However, if your colleagues are Java-infected, they might prefer a singleton. Also, if you
have an existing class that isn't a singleton but should be, using MooseX::Singleton is the easiest way to convert it.
package Config;
use MooseX::Singleton; # instead of Moose
has 'cache_dir' => ( ... );
It's that simple.
EXTENSIONS TO CONSIDER
There are literally dozens of other extensions on CPAN. This is a list of extensions that you might find useful, but we're not quite ready
to endorse just yet.
MooseX::Declare
Extends Perl with Moose-based keywords using "Devel::Declare". Very cool, but still new and experimental.
class User {
has 'name' => ( ... );
has 'email' => ( ... );
method login (Str $password) { ... }
}
MooseX::Types
This extension helps you build a type library for your application. It also lets you predeclare type names and use them as barewords.
use MooseX::Types -declare => ['PositiveInt'];
use MooseX::Types::Moose 'Int';
subtype PositiveInt,
as Int,
where { $_ > 0 },
message { "Int is not larger than 0" };
One nice feature is that those bareword names are actually namespaced in Moose's type registry, so multiple applications can use the same
bareword names, even if the type definitions differ.
MooseX::Types::Structured
This extension builds on top of MooseX::Types to let you declare complex data structure types.
use MooseX::Types -declare => [ qw( Name Color ) ];
use MooseX::Types::Moose qw(Str Int);
use MooseX::Types::Structured qw(Dict Tuple Optional);
subtype Name
=> as Dict[ first => Str, middle => Optional[Str], last => Str ];
subtype Color
=> as Tuple[ Int, Int, Int, Optional[Int] ];
Of course, you could always use objects to represent these sorts of things too.
MooseX::ClassAttribute
This extension provides class attributes for Moose classes. The declared class attributes are introspectable just like regular Moose
attributes.
package User;
use Moose;
use MooseX::ClassAttribute;
has 'name' => ( ... );
class_has 'Cache' => ( ... );
Note however that this class attribute does not inherit like a Class::Data::Inheritable or similar attribute - calling
$subclass->Cache($cache);
will set it for the superclass as well. Additionally, class data is usually The Wrong Thing To Do in a strongly OO program since it makes
testing a lot harder - consider carefully whether you'd be better off with an object that's passed around instead.
MooseX::Daemonize
This is a role that provides a number of methods useful for creating a daemon, including methods for starting and stopping, managing a PID
file, and signal handling.
MooseX::Role::Parameterized
If you find yourself wanting a role that customizes itself for each consumer, this is the tool for you. With this module, you can create a
role that accepts parameters and generates attributes, methods, etc. on a customized basis for each consumer.
MooseX::POE
This is a small wrapper that ties together a Moose class with "POE::Session", and gives you an "event" sugar function to declare event
handlers.
MooseX::FollowPBP
Automatically names all accessors Perl Best Practices-style, "get_size" and "set_size".
MooseX::SemiAffordanceAccessor
Automatically names all accessors with an explicit set and implicit get, "size" and "set_size".
MooseX::NonMoose
MooseX::NonMoose allows for easily subclassing non-Moose classes with Moose, taking care of the annoying details connected with doing this,
such as setting up proper inheritance from Moose::Object and installing (and inlining, at make_immutable time) a constructor that makes
sure things like BUILD methods are called.
AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for
details.
COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Infinity Interactive, Inc..
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
perl v5.14.2 2012-06-28 Moose::Manual::MooseX(3pm)