A.12. Command Cancellation

Commands submitted to JBoss Data Virtualization may be aborted in several scenarios:

Unlike the other execution methods, which are handled in a single-threaded manner, calls to cancel happen asynchronously with respect to the execution thread.

Your connector implementation may choose to do nothing in response to this cancellation message. In this instance, JBoss Data Virtualization will call close() on the execution object after current processing has completed. Implementing the cancel() method allows for faster termination of queries being processed and may allow the underlying data source to terminate its operations faster as well.