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MooseX::Singleton.3pm
Langue: en
Version: 2009-09-12 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
MooseX::Singleton - turn your Moose class into a singletonSYNOPSIS
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 a new class metaclass and instance metaclass, so if you're doing metamagic you may not be able to use this.
"MooseX::Singleton" gives your class an "instance" method that can be used to get a handle on the singleton. It's actually just an alias for "new".
Alternatively, "YourPackage->method" should just work. This includes accessors.
If you need to reset your class's singleton object for some reason (e.g. tests), you can call "YourPackage->_clear_instance".
TODO
- Always more tests and doc
- Fix speed boost
- "instance" invokes "new" every time "Package->method" is called, which incurs a nontrivial runtime cost. I've implemented a short-circuit for this case, which does eliminate nearly all of the runtime cost. However, it's ugly and should be fixed in a more elegant way.
BUGS
All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to cpan-RT.AUTHORS
Shawn M Moore <sartak@gmail.com>Dave Rolsky <autarch@urth.org>
SOME CODE STOLEN FROM
Anders Nor Berle <debolaz@gmail.com>AND PATCHES FROM
Ricardo SIGNES <rjbs@cpan.org>COPYRIGHT AND LICENSE
Copyright 2007, 2008 Infinity InteractiveThis program 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