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MooseX::Singleton(3)                 User Contributed Perl Documentation                MooseX::Singleton(3)



NAME
       MooseX::Singleton - turn your Moose class into a singleton

VERSION
       version 0.29

SYNOPSIS
           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;

DESCRIPTION
       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.

       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.

METHODS
       A singleton class will have the following additional methods:

   Singleton->instance
       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.

   Singleton->initialize(%args)
       This method can be called only once per class. It explicitly initializes the singleton object with
       the given arguments.

   Singleton->_clear_instance
       This clears the existing singleton instance for the class. Obviously, this is meant for use only
       inside the class itself.

   Singleton->new
       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.

BUGS
       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.

SOME CODE STOLEN FROM
       Anders Nor Berle <debolaz@gmail.com>

AND PATCHES FROM
       Ricardo SIGNES <rjbs@cpan.org>

AUTHOR
       Shawn M Moore <sartak@gmail.com>

COPYRIGHT AND LICENSE
       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.



perl v5.16.2                                     2011-12-08                             MooseX::Singleton(3)