From 8db8c6f4ce3e8dd7f90553ab7866bf9991773b98 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jos=C3=A9=20Valim?= Date: Sat, 19 Jun 2010 16:44:35 +0200 Subject: Add ActiveSupport::DescendantsTracker. --- .../lib/active_support/descendants_tracker.rb | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 activesupport/lib/active_support/descendants_tracker.rb (limited to 'activesupport/lib/active_support/descendants_tracker.rb') diff --git a/activesupport/lib/active_support/descendants_tracker.rb b/activesupport/lib/active_support/descendants_tracker.rb new file mode 100644 index 0000000000..a9379bf95b --- /dev/null +++ b/activesupport/lib/active_support/descendants_tracker.rb @@ -0,0 +1,36 @@ +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 \ No newline at end of file -- cgit v1.2.3