What is the Scala equivalent of F#'s async workflows?

Question

What is the Scala equivalent of F#\'s async workflows?

For example, how would following F# snippet translate to idiomatic Scala?

open System.Net
open         


        

Answer 1

You code more or less directly can be translated to Scala using Futures (with some important features lost, though):

import scala.actors.Futures
import Futures._

val urlList = Map("Microsoft.com" -> "http://www.microsoft.com/",
                "MSDN" -> "http://msdn.microsoft.com/",
                "Bing" -> "http://www.bing.com")


def fetchAsync(name: String, url: String) = future {
    // lengthy operation simulation
    Thread.sleep(1000)
    println("Fetching from %s: %s" format(name, url))
}

def runAll = 
    //Futures.awaitAll(  <- if you want to synchronously wait for the futures to complete 
    urlList.map{case (name, url) => fetchAsync(name, url)}
    //)