scala - dispatch example not working

Question

I'm following the very first example in the dispatchdocs -

    val svc = url("http://api.hostip.info/country.php")
    val country = Http(svc OK as.String)
    for (c <- country)
      println(c)

I do not get any output printed. When I change it to below to make blocking call then I get the output.

val res = country()
println(res)

Need help with this.

Full program-

import dispatch._
object DispatchTest {

  def main(args: Array[String]) {
    val svc = url("http://api.hostip.info/country.php")
    val country = Http(svc OK as.String)
    for (c <- country)
      println(c)
  }
}

Answer 1

Hmm, not sure here, but maybe the problem is that your main thread is finished so fast, that background thread (in which Dispatch works asynchronously) has no time for taking action?

To check this you may try to insert a delay:

for (c <- country) // Here we spawn a background thread!
  println(c)

Thread.sleep(500) // So let's wait half a second for it to work

Of course, in real program you should never need to do this.

Another option for delay is simply a readLine() in the end of main.