A receiver can return an active, "done" or null delivery. The method returns null in case the receiver doesn't accept the message. The return value is unspecified when the message is submitted in the context of a transaction (tx not null).
@param observer - the component the delivery should be acknowledged to.
@see org.jboss.messaging.core.Delivery
@see org.jboss.messaging.core.DeliveryObserver
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