Aspect::Library::Singleton - A singleton aspect
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"
- 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
- No package variable or method is added to the callers
Note that this is just a special case of memoizing.
Adam Kennedy <firstname.lastname@example.org>
Marcel Gruenauer <email@example.com>
Ran Eilam <firstname.lastname@example.org>
Copyright 2001 by Marcel Gruenauer
Some parts copyright 2009 - 2013 Adam Kennedy.
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.