create
Creates a new instance of FutureObserver.
In case if the stream is completed with no value, the future view completed with null.
Return
new FutureObserver
Parameters
<T>
the type of the observed stream
Creates a new instance of FutureObserver.
In case if the stream is completed with no value, the future view completed with null.
new FutureObserver
the type of the observed stream