javaadvent_sample6.java

//What we're gonna do with the async text when available
Partial<Builder> textToApply = 
    sources.value(textf)
            .by((builder, text) -> builder.flatMapR(b -> text.mapR(b::text)));

//Same thing for the number
Partial<Builder> numberToApply = 
    sources.value(numberf)
            .by((builder, number) -> builder.flatMapR(b -> number.mapR(b::number)));