futureStuff.scala

import scala.concurrent.Future

object FutureStuff extends App {

  import scala.concurrent.ExecutionContext.Implicits.global

  val f1 = Future{
    Thread.sleep(10000)
    println("HI1")
    1
  }

  val f2 = Future{
    Thread.sleep(3000)
    println("HI2")
    2
  }

  val f3 = Future{
    Thread.sleep(1000)
    println("HI3")
    3
  }


  val future = for {
    v1 <- f1
    v2 <- f2
    v3 <- f3
  } yield (v1, v2, v3)


  future.onSuccess {
    case (_, _, _) => println(s"DONE!")
  }

  Thread.sleep(15000)
}