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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 = {}
class << self
def direct_descendants(klass)
@@direct_descendants[klass] || []
end
def descendants(klass)
arr = []
accumulate_descendants(klass, arr)
arr
end
def 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
# This is the only method that is not thread safe, but is only ever called
# during the eager loading phase.
def store_inherited(klass, descendant)
(@@direct_descendants[klass] ||= []) << descendant
end
private
def accumulate_descendants(klass, acc)
if direct_descendants = @@direct_descendants[klass]
acc.concat(direct_descendants)
direct_descendants.each { |direct_descendant| accumulate_descendants(direct_descendant, acc) }
end
end
end
def inherited(base)
DescendantsTracker.store_inherited(self, base)
super
end
def direct_descendants
DescendantsTracker.direct_descendants(self)
end
def descendants
DescendantsTracker.descendants(self)
end
end
end
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