TransactionCall

Reports the same settled outcome as handle.join(), once. The future is completed before this callback.

Reports operation failures, including unknown commit outcomes. Callback exceptions do not alter the transaction result.

Reports authorisation data. Return commit()/rollback() to decide inline, or deferred() for a later handle.commit()/rollback(). Without this callback the decision is also deferred. The final future and onComplete remain pending while awaiting that decision.