MooseX::Singleton - turn your Moose class into a singleton
version 0.29
package MyApp; use MooseX::Singleton; has env => ( is => 'rw', isa => 'HashRef[Str]', default => sub { \%ENV }, ); package main; delete MyApp->env->{PATH}; my $instance = MyApp->instance; my $same = MyApp->instance;
A singleton is a class that has only one instance in an application. MooseX::Singleton lets you easily upgrade (or downgrade, as it were) your Moose class to a singleton.
MooseX::Singleton
All you should need to do to transform your class is to change use Moose to use MooseX::Singleton. This module uses metaclass roles to do its magic, so it should cooperate with most other MooseX modules.
use Moose
use MooseX::Singleton
MooseX
A singleton class will have the following additional methods:
This returns the singleton instance for the given package. This method does not accept any arguments. If the instance does not yet exist, it is created with its defaults values. This means that if your singleton requires arguments, calling instance will die if the object has not already been initialized.
instance
This method can be called only once per class. It explicitly initializes the singleton object with the given arguments.
This clears the existing singleton instance for the class. Obviously, this is meant for use only inside the class itself.
This method currently works like a hybrid of initialize and instance. However, calling new directly will probably be deprecated in a future release. Instead, call initialize or instance as appropriate.
initialize
new
Please report any bugs or feature requests to bug-moosex-singleton@rt.cpan.org, or through the web interface at http://rt.cpan.org. We will be notified, and then you'll automatically be notified of progress on your bug as we make changes.
bug-moosex-singleton@rt.cpan.org
Anders Nor Berle <debolaz@gmail.com>
Ricardo SIGNES <rjbs@cpan.org>
Shawn M Moore <sartak@gmail.com>
This software is copyright (c) 2011 by Shawn M Moore.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install MooseX::Singleton, copy and paste the appropriate command in to your terminal.
cpanm
cpanm MooseX::Singleton
CPAN shell
perl -MCPAN -e shell install MooseX::Singleton
For more information on module installation, please visit the detailed CPAN module installation guide.