Scala Programming Projects

Callback

Another way to get the result is to use a callback function. In this case, we stay asynchronous to get the value. The syntax is as follows:

Import scala.concurrent.{Await, Future}
import scala.util.{Failure, Success}
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration._

val f: Future[String] = Future {
  Thread.sleep(1000)
  “Finished”
}
f.onComplete {
  case Success(value) => println(value)
  case Failure(e) => e.printStackTrace()
}

First, Future is created and assigned to f; then, we handle the success case, and then, the failure case.