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Composing Futures with a for-comprehension
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| // Credit: http://blog.knoldus.com/2013/01/27/akka-futures-using-for-comprehensions/ | |
| import akka.actor.ActorSystem | |
| import scala.concurrent.{future, Future, Await } | |
| import scala.concurrent.ExecutionContext.Implicits.global | |
| object FutureComposingWithFor extends App { | |
| def longRunningFunction(number: Int) = { | |
| // Sleep for 3 seconds and return number | |
| Thread.sleep(3000) | |
| number | |
| } | |
| val system = ActorSystem("future") | |
| val startTime = System.currentTimeMillis | |
| val future1 = future { longRunningFunction(1) } | |
| val future2 = future { longRunningFunction(2) } | |
| val future3 = future { longRunningFunction(3) } | |
| val futuresum = for { | |
| a <- future1 | |
| b <- future2 | |
| c <- future3 | |
| } yield (a + b + c) | |
| futuresum onSuccess { | |
| case sum => | |
| val elapsedTime = ((System.currentTimeMillis - startTime) / 1000.0) | |
| println("Sum of 1, 2, and 3 is " + sum + " calculated in " + elapsedTime + " seconds") | |
| } | |
| } |
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