dump method
Implementation
@override
void dump() {
final now = DateTime.now();
final year = now.year;
final month = now.month.toString().padLeft(2, '0');
final day = now.day.toString().padLeft(2, '0');
final hour = now.hour.toString().padLeft(2, '0');
final minute = now.minute.toString().padLeft(2, '0');
final second = now.second.toString().padLeft(2, '0');
_fileName = '$year$month$day$hour$minute$second-${uid4() + uid4()}.txt';
}