Used by a Requestor to begin and maintain a subscription, as specified using a DOFQuery and a context, to be notified of changes to a property's value. DOFSubscription will select one matching provider and subscribe to its matching property. If there is no matching provider, then DOFSubscription will wait for one. If the provider goes away, then the search will resume for a matching provider.

To cancel the subscription, call DOFSubscription.destroy() .

NOTE: The Property's current value is always returned when the subscription is started.

NOTE: Intermediate changes that occur more frequently than minPeriod may be dropped to save bandwidth, but the most current value of the Property is always returned.

NOTE: An application must first express interest by calling beginInterest(DOFObjectID, DOFInterestLevel) . Interest goes out on the network and looks for matching providers. The query, on the other hand, searches through the local set of known providers (those already found through interest). If no interest is specified, then no non-local providers will be found.

public DOFSubscription createSubscription(
	DOFQuery query,
	DOFInterfaceProperty property,
	int minPeriod,
	DOFSubscriptionListener listener
)