emailler/server/lib/SubclassTracking.rb

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#derived from http://ola-bini.blogspot.com/2007/07/objectspace-to-have-or-not-to-have.html
module SubclassTracking
def self.extended(klazz)
(class <<klazz; self; end).send :attr_accessor, :subclasses
(class <<klazz; self; end).send :define_method, :inherited do |clzz|
klazz.subclasses << clzz
super
end
klazz.subclasses = []
end
end