    def flush(ops = queue)
      operations, callbacks = ops.transpose

      logging(operations) do
        ensure_connected do
          connection.write operations
          replies = connection.receive_replies(operations)

          replies.zip(callbacks).map do |reply, callback|
            callback ? callback[reply] : reply
          end.last
        end
      end
    ensure
      ops.clear
    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.