new

# File activesupport/lib/active_support/notifications/fanout.rb, line 70
        def self.new(pattern, listener)
          if listener.respond_to?(:start) and listener.respond_to?(:finish)
            subscriber = Evented.new pattern, listener
          else
            subscriber = Timed.new pattern, listener
          end

          unless pattern
            AllMessages.new(subscriber)
          else
            subscriber
          end
        end