Class: Dependency

Inherits:
Object show all
Defined in:
lib/volt/reactive/dependency.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Dependency

Returns a new instance of Dependency.



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# File 'lib/volt/reactive/dependency.rb', line 31

def initialize
  @dependencies = Set.new
end

Instance Method Details

#changed! ⇒ Object 



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# File 'lib/volt/reactive/dependency.rb', line 53

def changed!
  deps = @dependencies

  # If no deps, dependency has been removed
  return unless deps

  @dependencies = Set.new

  deps.each do |dep|
    dep.invalidate!
  end
end

#depend ⇒ Object 



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# File 'lib/volt/reactive/dependency.rb', line 35

def depend
  # If there is no @dependencies, don't depend because it has been removed
  return unless @dependencies

  current = Computation.current
  if current
    added = @dependencies.add?(current)

    if added
      # puts "Added #{self.inspect} to #{current.inspect}"
      current.on_invalidate do
        # If @dependencies is nil, this Dependency has been removed
        @dependencies.delete(current) if @dependencies
      end
    end
  end
end

#remove ⇒ Object

Called when a dependency is no longer needed



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# File 'lib/volt/reactive/dependency.rb', line 67

def remove
  changed!
  @dependencies = nil
end