NCache provides a DeliveryOption enum which specifies how the message should be delivered to any registered subscribers. The delivery option is specified during message publishing phase. It contains the following options:
public enum DeliveryOption : byte
Delivers message to all registered subscribers, if no subscriber has been registered, it will return without any failure acknowledgment. Message will be sent to any subscriber when it registers on topic; unless message expiration has not occurred.
Delivers message to any one of the registered subscribers. If acknowledgement is not received, the message is reassigned to another subscriber till it reaches its expiration time limit.