public interface FilteredSubscriptionSymbol
TimeSeriesSubscriptionSymbol) that attach "filters" to the actual symbols. Filtered subscription symbols implement their
Object.hashCode()methods based on their symbol only, without considering their "filter" part (for example, a
fromTimefilter on a time range of events).
DXFeedSubscription has the following behavior for filtered symbols. There can be only one
active filter per symbol. Adding new filtered symbol with the same symbol but different filter
removes the old one from subscription, adds the new one, and notifies
ObservableSubscriptionChangeListener about this subscription change.
The later is a special behaviour for filtered subscription symbols, because on other types of
String, for example) there is no notification when replacing one symbol
with the other that is "equal" to the first one.
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