Composing Futures
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import akka.dispatch.Future | |
import akka.actor.ActorSystem | |
object FutureMonadic extends App { | |
implicit val system = ActorSystem("future") | |
val startTime = System.currentTimeMillis | |
// we construct List[Future[Int]] | |
val futureList = List(1, 2, 3) map { case number => Future(timeTakingIdentityFunction(number)) } | |
val future = Future.sequence(futureList) | |
future onSuccess { | |
case results => | |
val elapsedTime = ((System.currentTimeMillis - startTime) / 1000.0) | |
println("Sum of 1, 2 and 3 is " + results.sum + " calculated in " + elapsedTime + " seconds") | |
} | |
def timeTakingIdentityFunction(number: Int) = { | |
Thread.sleep(3000) | |
number | |
} | |
} |
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