T - The type of SingleSource.Subscriber.R - the type of SingleSource.public static interface SingleSource.Processor<T,R> extends SingleSource<R>, SingleSource.Subscriber<T>
SingleSource.Processor represents a processing stage that is both a SingleSource and a SingleSource.Subscriber
and obeys the contracts of both.SingleSource.Processor<T,R>, SingleSource.Subscriber<T>subscribeonError, onSubscribe, onSuccess