How do you use Flowable.generate from Kotlin

Here's a failed stub attempt at Flowable.generate (with more type annotations than I'd normally use):

val xs: Flowable<String> = Flowable.generate<Int, String>(
  java.util.concurrent.Callable<Int> { -> 0 },
  io.reactivex.functions.BiConsumer<Int, String> { t1, t2 -> }
)

The Java signature I'd like to use is:

public static <T, S> Flowable<T> generate(Callable<S> initialState, final BiConsumer<S, Emitter<T>> generator)

The error I'm getting is:

Error:(145, 12) None of the following functions can be called with the arguments supplied:
@CheckReturnValue @BackpressureSupport @SchedulerSupport public final fun <T : Any!, S : Any!> generate(p0: (() -> (???..???))!, p1: (((???..???), Emitter<(???..???)>!) -> Unit)!): Flowable<(???..???)>! defined in io.reactivex.Flowable
@CheckReturnValue @BackpressureSupport @SchedulerSupport public final fun <T : Any!, S : Any!> generate(p0: (() -> (???..???))!, p1: ((???, Emitter<(???..???)>) -> ???)!): Flowable<(???..???)>! defined in io.reactivex.Flowable
@CheckReturnValue @BackpressureSupport @SchedulerSupport public open fun <T : Any!, S : Any!> generate(p0: Callable<(???..???)>!, p1: BiConsumer<(???..???), Emitter<String!>!>!): Flowable<String!>! defined in io.reactivex.Flowable
@CheckReturnValue @BackpressureSupport @SchedulerSupport public open fun <T : Any!, S : Any!> generate(p0: Callable<Int!>!, p1: BiFunction<Int!, Emitter<(???..???)>!, Int!>!): Flowable<(???..???)>! defined in io.reactivex.Flowable

What should I be feeding the compiler?

Solution

The type for generate() should be <String, Int> and the type for BiConsumer should be <Int, Emitter<String>>.

val xs: Flowable<String> = Flowable.generate<String, Int>(
        java.util.concurrent.Callable<Int> { -> 0 },
        io.reactivex.functions.BiConsumer<Int, Emitter<String>> { t1, t2 ->  }
)