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/**
* Copyright (C) 2012 Typesafe Inc. <http://www.typesafe.com>
*/
import language.{ reflectiveCalls, postfixOps }
import scala.concurrent.{ Future, ExecutionContext, future, Await, Promise }
import scala.concurrent.duration._
import scala.async.EndTaskException
import scala.async.Async.{ async, await, awaitCps }
import scala.util.continuations.reset
object TestManual extends App {
Fallback0ManualSpec.check()
}
class TestFallback0ManualClass {
import ExecutionContext.Implicits.global
def m1(x: Int): Future[Int] = future {
x + 2
}
def m2(y: Int): Future[Int] = {
val p = Promise[Int]()
future { reset {
val f = m1(y)
var z = 0
val res = awaitCps(f, p) + 5
if (res > 0) {
z = 2
} else {
z = 4
}
z
} }
p.future
}
/* that isn't even supported by current CPS plugin
def m3(y: Int): Future[Int] = {
val p = Promise[Int]()
future { reset {
val f = m1(y)
var z = 0
val res: Option[Int] = Some(5)
res match {
case None => z = 4
case Some(a) => z = awaitCps(f, p) - 10
}
z
} }
p.future
}
*/
}
object Fallback0ManualSpec extends MinimalScalaTest {
"An async method" should {
"support await in a simple if-else expression" in {
val o = new TestFallback0ManualClass
val fut = o.m2(10)
val res = Await.result(fut, 2 seconds)
res mustBe(2)
}
}
}
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