groups_for

# File activesupport/lib/active_support/notifications/fanout.rb, line 191
      def groups_for(name) # :nodoc:
        groups = @groups_for.compute_if_absent(name) do
          all_listeners_for(name).reject(&:silenceable).group_by(&:group_class).transform_values do |s|
            s.map(&:delegate)
          end
        end

        silenceable_groups = @silenceable_groups_for.compute_if_absent(name) do
          all_listeners_for(name).select(&:silenceable).group_by(&:group_class).transform_values do |s|
            s.map(&:delegate)
          end
        end

        unless silenceable_groups.empty?
          groups = groups.dup
          silenceable_groups.each do |group_class, subscriptions|
            active_subscriptions = subscriptions.reject { |s| s.silenced?(name) }
            unless active_subscriptions.empty?
              groups[group_class] = (groups[group_class] || []) + active_subscriptions
            end
          end
        end

        groups
      end