clear_cache

# File activesupport/lib/active_support/notifications/fanout.rb, line 105
      def clear_cache(key = nil) # :nodoc:
        if key
          @all_listeners_for.delete(key)
          @groups_for.delete(key)
          @silenceable_groups_for.delete(key)
        else
          @all_listeners_for.clear
          @groups_for.clear
          @silenceable_groups_for.clear
        end
      end