presto-atop/src/main/java/io/prestosql/plugin/atop/AtopProcessFactory.java/AtopProcessFactory/next
class AtopProcessFactory:        @Override
        public String next()
        {
            if (line == null) {
                throw new NoSuchElementException();
            }
            String currentLine = line;
            try {
                line = reader.readLine();
            }
            catch (IOException e) {
                line = null;
            }
            catch (UncheckedTimeoutException e) {
                throw new PrestoException(ATOP_READ_TIMEOUT, "Timeout reading from atop process");
            }

            return currentLine;
        }