Javadoc
Handle the completed event.
Active -> Active (invalid state)
Canceling -> Canceling (invalid state)
Completing -> Completed
Completed -> Completed
Closing -> Closing (invalid state)
Compensating -> Compensating (invalid state)
Failing-Active -> Failing-Active (invalid state)
Failing-Canceling -> Failing-Canceling (invalid state)
Failing-Completing -> Failing-Completing (invalid state)
Failing-Compensating -> Failing-Compensating (invalid state)
Exiting -> Exiting (invalid state)
NotCompleting -> NotCompleting (invalid state)
Ended -> Ended (invalid state)