code: def _on_file_created(self, event: FileSystemEvent):
          
          if not event.is_directory and self.is_data_file(event.src_path):
              assert event.src_path not in self._origin_mapped_data
              self._origin_mapped_data[event.src_path] = self.no_error_extract_data_from_file(event.src_path)
              self.notify_listeners(FileSystemChange.CREATE)
docs: Called when a file in the monitored directory has been created.
          :param event: the file system event