ListenableFuture to scala Future

Question

I am in the process of writing a small scala wrapper around a java library.

The java library has an object QueryExecutor exposing 2 methods:

• execute(query)

Answer 1

Another, slightly shorter solution:

implicit class ListenableFutureDecorator[T](val f: ListenableFuture[T]) extends AnyVal {
  def asScala(implicit e: Executor): Future[T] = {
    val p = Promise[T]()
    f.addListener(() => p.complete(Try(f.get())), e)
    p.future
  }
}