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import scala.concurrent.{
Future,
Promise,
TimeoutException,
SyncVar,
ExecutionException
}
trait TestBase {
def future[T](body: =>T): Future[T]
def promise[T]: Promise[T]
def once(body: (() => Unit) => Unit) {
val sv = new SyncVar[Boolean]
body(() => sv put true)
sv.take()
}
}
trait FutureCallbacks extends TestBase {
def testOnSuccess(): Unit = once {
done =>
var x = 0
val f = future {
x = 1
}
f onSuccess { _ =>
done()
assert(x == 1)
}
}
def testOnSuccessWhenCompleted(): Unit = once {
done =>
var x = 0
val f = future {
x = 1
}
f onSuccess { _ =>
assert(x == 1)
x = 2
f onSuccess { _ =>
assert(x == 2)
done()
}
}
}
def testOnSuccessWhenFailed(): Unit = once {
done =>
val f = future[Unit] {
done()
throw new Exception
}
f onSuccess { _ =>
assert(false)
}
}
def testOnFailure(): Unit = once {
done =>
var x = 0
val f = future[Unit] {
x = 1
throw new Exception
}
f onSuccess { _ =>
done()
assert(false)
}
f onFailure {
case _ =>
done()
assert(x == 1)
}
}
def testOnFailureWhenSpecialThrowable(num: Int, cause: Throwable): Unit = once {
done =>
val f = future[Unit] {
throw cause
}
f onSuccess { _ =>
done()
assert(false)
}
f onFailure {
case e: ExecutionException if (e.getCause == cause) =>
done()
case _ =>
done()
assert(false)
}
}
def testOnFailureWhenTimeoutException(): Unit = once {
done =>
val f = future[Unit] {
throw new TimeoutException()
}
f onSuccess { _ =>
done()
assert(false)
}
f onFailure {
case e: TimeoutException =>
done()
case other =>
done()
assert(false)
}
}
testOnSuccess()
testOnSuccessWhenCompleted()
testOnSuccessWhenFailed()
testOnFailure()
testOnFailureWhenSpecialThrowable(5, new Error)
testOnFailureWhenSpecialThrowable(6, new scala.util.control.ControlThrowable { })
testOnFailureWhenSpecialThrowable(7, new InterruptedException)
testOnFailureWhenTimeoutException()
}
trait FutureCombinators extends TestBase {
}
trait FutureProjections extends TestBase {
}
trait Promises extends TestBase {
def testSuccess(): Unit = once {
done =>
val p = promise[Int]
val f = p.future
f.onSuccess { x =>
done()
assert(x == 5)
} onFailure { case any =>
done()
assert(false)
}
p.success(5)
}
testSuccess()
}
trait Exceptions extends TestBase {
}
object Test
extends App
with FutureCallbacks
with FutureCombinators
with FutureProjections
with Promises
with Exceptions
{
def future[T](body: =>T) = scala.concurrent.future(body)
def promise[T] = scala.concurrent.promise[T]
}
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