compile

# File activesupport/lib/active_support/callbacks.rb, line 553
      def compile
        @callbacks || @mutex.synchronize do
          final_sequence = CallbackSequence.new { |env| Filters::ENDING.call(env) }
          @callbacks ||= @chain.reverse.inject(final_sequence) do |callback_sequence, callback|
            callback.apply callback_sequence
          end
        end
      end