dmSelf is used as the address where the DM-confirmation-messages should be sent. In a sharding environment, this has to be our dispatcher which knows how to reach the sharding mechanism. If null, we'll fallback to self - useful when testing
If doUnconfirmedWarningProcessing is turned on, then override this method to try to do something useful before we give up
Override this to decide if the failed outbound durableMessage should result in a persisted event.
Called when actor has been idle for too long..
Used when processing events live - not recovering
Used when recovering events
Used when processing commands