Classes supporting the Flowable base reactive class: connectable and grouped flowables.


ConnectableFlowable<T> A ConnectableObservable resembles an ordinary Flowable, except that it does not begin emitting items when it is subscribed to, but only when its connect() method is called. 
GroupedFlowable<K, T> A Flowable that has been grouped by key, the value of which can be obtained with getKey()