unsubscribe

# File activesupport/lib/active_support/notifications/fanout.rb, line 28
      def unsubscribe(subscriber_or_name)
        synchronize do
          case subscriber_or_name
          when String
            @subscribers.reject! { |s| s.matches?(subscriber_or_name) }
          else
            @subscribers.delete(subscriber_or_name)
          end

          @listeners_for.clear
        end
      end