Aspect::Library::Singleton - A singleton aspect
use Aspect; use Aspect::Singleton; aspect Singleton => 'Foo::new'; my $f1 = Foo->new; my $f2 = Foo->new; # Both $f1 and $f2 refer to the same object
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):
Class::Singleton
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.
instance()
_new_instance()
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.
No package variable or method is added to the callers namespace
Note that this is just a special case of memoizing.
Adam Kennedy <adamk@cpan.org>
Marcel Grünauer <marcel@cpan.org>
Ran Eilam <eilara@cpan.org>
Copyright 2001 by Marcel Grünauer
Some parts copyright 2009 - 2012 Adam Kennedy.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install Aspect, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Aspect
CPAN shell
perl -MCPAN -e shell install Aspect
For more information on module installation, please visit the detailed CPAN module installation guide.