diff options
| author | José Valim <jose.valim@gmail.com> | 2010-06-19 16:44:35 +0200 |
|---|---|---|
| committer | José Valim <jose.valim@gmail.com> | 2010-06-19 16:44:35 +0200 |
| commit | 8db8c6f4ce3e8dd7f90553ab7866bf9991773b98 (patch) | |
| tree | 38b7b95a5215266ec0836d4c4b0cc097b10280e5 /activesupport | |
| parent | a186431414de8a0f0db9f60254f421a3536cee12 (diff) | |
| download | rails-8db8c6f4ce3e8dd7f90553ab7866bf9991773b98.tar.gz rails-8db8c6f4ce3e8dd7f90553ab7866bf9991773b98.tar.bz2 rails-8db8c6f4ce3e8dd7f90553ab7866bf9991773b98.zip | |
Add ActiveSupport::DescendantsTracker.
Diffstat (limited to 'activesupport')
| -rw-r--r-- | activesupport/lib/active_support.rb | 1 | ||||
| -rw-r--r-- | activesupport/lib/active_support/descendants_tracker.rb | 36 | ||||
| -rw-r--r-- | activesupport/test/descendants_tracker_test.rb | 72 |
3 files changed, 109 insertions, 0 deletions
diff --git a/activesupport/lib/active_support.rb b/activesupport/lib/active_support.rb index e34e46b4cf..f93b351655 100644 --- a/activesupport/lib/active_support.rb +++ b/activesupport/lib/active_support.rb @@ -51,6 +51,7 @@ module ActiveSupport autoload :Concern autoload :Configurable autoload :Deprecation + autoload :DescendantsTracker autoload :Gzip autoload :Inflector autoload :JSON 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 diff --git a/activesupport/test/descendants_tracker_test.rb b/activesupport/test/descendants_tracker_test.rb new file mode 100644 index 0000000000..57c97b45d2 --- /dev/null +++ b/activesupport/test/descendants_tracker_test.rb @@ -0,0 +1,72 @@ +require 'abstract_unit' +require 'test/unit' +require 'active_support' + +class DescendantsTrackerTest < Test::Unit::TestCase + class Parent + extend ActiveSupport::DescendantsTracker + end + + class Child1 < Parent + end + + class Child2 < Parent + end + + class Grandchild1 < Child1 + end + + class Grandchild2 < Child1 + end + + def test_descendants + assert_equal [Child1, Grandchild1, Grandchild2, Child2], Parent.descendants + assert_equal [Grandchild1, Grandchild2], Child1.descendants + assert_equal [], Child2.descendants + end + + def test_direct_descendants + assert_equal [Child1, Child2], Parent.direct_descendants + assert_equal [Grandchild1, Grandchild2], Child1.direct_descendants + assert_equal [], Child2.direct_descendants + end + + def test_clear_with_autoloaded_parent_children_and_granchildren + mark_as_autoloaded Parent, Child1, Child2, Grandchild1, Grandchild2 do + ActiveSupport::DescendantsTracker.clear + assert_equal Hash.new, ActiveSupport::DescendantsTracker.descendants + end + end + + def test_clear_with_autoloaded_children_and_granchildren + mark_as_autoloaded Child1, Grandchild1, Grandchild2 do + ActiveSupport::DescendantsTracker.clear + assert_equal [Child2], Parent.descendants + assert_equal [], Child2.descendants + end + end + + def test_clear_with_autoloaded_granchildren + mark_as_autoloaded Grandchild1, Grandchild2 do + ActiveSupport::DescendantsTracker.clear + assert_equal [Child1, Child2], Parent.descendants + assert_equal [], Child1.descendants + assert_equal [], Child2.descendants + end + end + + protected + + def mark_as_autoloaded(*klasses) + old_autoloaded = ActiveSupport::Dependencies.autoloaded_constants.dup + ActiveSupport::Dependencies.autoloaded_constants = klasses.map(&:name) + + old_descendants = ActiveSupport::DescendantsTracker.descendants.dup + old_descendants.each { |k, v| old_descendants[k] = v.dup } + + yield + ensure + ActiveSupport::Dependencies.autoloaded_constants = old_autoloaded + ActiveSupport::DescendantsTracker.descendants = old_descendants + end +end
\ No newline at end of file |