        def next
          now = Time.new.to_i

          counter = @mutex.synchronize do
            last_timestamp, @last_timestamp = @last_timestamp, now

            if last_timestamp == now
              @counter += 1
            else
              @counter = 0
            end
          end

          generate(now, counter)
        end
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.