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