public class SubscriptionConstraints
Collects constraints to be applied on a subscription, to change the
currently set parameters for all the involved items.
They can only be used in order to restrict the constraints set
by Lightstreamer Server Metadata Adapter.
Currently, only a constraint on the maximum update frequency is supported.
Maximum update frequency constraint; a 0 value means that no frequency
limit should be set. It can only be used in order to lower
the frequency granted by the Metadata Adapter.
A null value means that no change of the update frequency constraint
is requested; it is useless, but reserved for future extensions.
The update frequency limit is obeyed only for MERGE, DISTINCT and COMMAND
Items mode; in the latter case, the limit only applies to consecutive UPDATE
events for the same key value.
If unfiltered dispatching has been requested for the Items, the change
will be refused.
Note that a further global frequency limit is also imposed by the
Server, if it is running in Presto edition; by the way, this specific limit
also applies to RAW mode and to unfiltered dispatching.
Creates a subscription constraints bean object with no constraints