If the Resume Reading feature is not enabled:
Data-read Stop Then Restart: Any unread data at the end of the file is ignored.
Resume Reading in Progress: If there is a resume-reading operation in progress from a previous execution, an error is generated, and an exception is thrown.
If there is a resume-reading operation in progress it cannot be interrupted and must be completed. The executeBusinessRules() method must be called enough times to fully consume the file. In other words, do not discontinue processing the file before it has been completely consumed.