Serialized Futures using for comprehension

gistfile1.scala

import scala.util._
import scala.concurrent._
import ExecutionContext.Implicits.global

val f1: Future[String] = Future {
  Thread.sleep(200)
  "done 1..."
}

val f2: Future[String] = Future {
  Thread.sleep(200)
  "done 2..."
}

def combine(s1: String, s12: String): String = "result"

val serializedFutures = for {
  val1 <- f1
  val2 <- f2
} yield combine(val1, val2)

f1 onComplete{
  case Success(result) => println(result)
  case Failure(t) => println("An error has occured: " + t.getMessage)
}

f2 onComplete{
  case Success(result) => println(result)
  case Failure(t) => println("An error has occured: " + t.getMessage)
}

serializedFutures onComplete{
 case resTry => println("Both Done: Success=" + resTry.isSuccess)
}