Module: ActiveSupport::DescendantsTracker

Included in:
AbstractController::Base, ActionMailer::Preview, ActiveRecord::Base
Defined in:
activesupport/lib/active_support/descendants_tracker.rb

Overview

This module provides an internal implementation to track descendants which is faster than iterating through ObjectSpace.

Defined Under Namespace

Classes: DescendantsArray

Constant Summary collapse

@@direct_descendants = 
{}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.clear ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 23

def clear
  if defined? ActiveSupport::Dependencies
    @@direct_descendants.each do |klass, descendants|
      if Dependencies.autoloaded?(klass)
        @@direct_descendants.delete(klass)
      else
        descendants.reject! { |v| Dependencies.autoloaded?(v) }
      end
    end
  else
    @@direct_descendants.clear
  end
end

.descendants(klass) ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 17

def descendants(klass)
  arr = []
  accumulate_descendants(klass, arr)
  arr
end

.direct_descendants(klass) ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 12

def direct_descendants(klass)
  descendants = @@direct_descendants[klass]
  descendants ? descendants.to_a : []
end

.store_inherited(klass, descendant) ⇒ Object

This is the only method that is not thread safe, but is only ever called during the eager loading phase.



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 39

def store_inherited(klass, descendant)
  (@@direct_descendants[klass] ||= DescendantsArray.new) << descendant
end

Instance Method Details

#descendants ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 63

def descendants
  DescendantsTracker.descendants(self)
end

#direct_descendants ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 59

def direct_descendants
  DescendantsTracker.direct_descendants(self)
end

#inherited(base) ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 54

def inherited(base)
  DescendantsTracker.store_inherited(self, base)
  super
end