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author | José Valim <jose.valim@gmail.com> | 2010-06-19 16:44:35 +0200 |
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committer | José Valim <jose.valim@gmail.com> | 2010-06-19 16:44:35 +0200 |
commit | 8db8c6f4ce3e8dd7f90553ab7866bf9991773b98 (patch) | |
tree | 38b7b95a5215266ec0836d4c4b0cc097b10280e5 /activesupport/lib/active_support | |
parent | a186431414de8a0f0db9f60254f421a3536cee12 (diff) | |
download | rails-8db8c6f4ce3e8dd7f90553ab7866bf9991773b98.tar.gz rails-8db8c6f4ce3e8dd7f90553ab7866bf9991773b98.tar.bz2 rails-8db8c6f4ce3e8dd7f90553ab7866bf9991773b98.zip |
Add ActiveSupport::DescendantsTracker.
Diffstat (limited to 'activesupport/lib/active_support')
-rw-r--r-- | activesupport/lib/active_support/descendants_tracker.rb | 36 |
1 files changed, 36 insertions, 0 deletions
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
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