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require 'active_support/dependencies'
module ActiveSupport
# This module provides an internal implementation to track descendants
# which is faster than iterating through ObjectSpace.
module DescendantsTracker
mattr_accessor :descendants
@@descendants = Hash.new { |h, k| h[k] = [] }
def self.clear
@@descendants.each do |klass, descendants|
if ActiveSupport::Dependencies.autoloaded?(klass)
@@descendants.delete(klass)
else
descendants.reject! { |v| ActiveSupport::Dependencies.autoloaded?(v) }
end
end
end
def inherited(base)
self.direct_descendants << base
super
end
def direct_descendants
@@descendants[self]
end
def descendants
@@descendants[self].inject([]) do |descendants, klass|
descendants << klass
descendants.concat klass.descendants
end
end
end
end
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