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Aspect::Library::Singleton.3pm
Langue: en
Version: 2010-05-27 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
Aspect::Library::Singleton - A singleton aspectSYNOPSIS
use Aspect::Singleton; aspect Singleton => 'Foo::new'; my $f1 = Foo->new; my $f2 = Foo->new; # now $f1 and $f2 refer to the same object
SUPER
Aspect::ModularDESCRIPTION
A reusable aspect that forces singleton behavior on a constructor. The constructor is defined by a pointcut spec: a string. regexp, or code ref.It is slightly different from "Class::Singleton" (<http://search.cpan.org/~abw/Class-Singleton/Singleton.pm>):
- •
- No specific name requirement on the constructor for the external interface, or for the implementation ("Class::Singleton" requires clients use "instance()", and that subclasses override "_new_instance()"). With aspects, you can change the cardinality of your objects without changing the clients, or the objects themselves.
- •
- No need to inherit from anything- use pointcuts to specify the constructors you want to memoize. Instead of pulling singleton behavior from a base class, you are pushing it in, using the aspect.
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- No package variable or method is added to the callers namespace
Note that this is just a special case of memoizing.
AUTHORS
Adam Kennedy <adamk@cpan.org>Marcel Gru.nauer <marcel@cpan.org>
Ran Eilam <eilara@cpan.org>
COPYRIGHT
Copyright 2001 by Marcel Gru.nauerSome parts copyright 2009 - 2010 Adam Kennedy.
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