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/*
* Copyright (C) 2012 Typesafe Inc. <http://www.typesafe.com>
*/
package scala.async
package run
package anf
import language.{reflectiveCalls, postfixOps}
import scala.concurrent.{Future, ExecutionContext, future, Await}
import scala.concurrent.duration._
import scala.async.Async.{async, await}
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
class AnfTestClass {
import ExecutionContext.Implicits.global
def base(x: Int): Future[Int] = future {
x + 2
}
def m(y: Int): Future[Int] = async {
val blerg = base(y)
await(blerg)
}
def m2(y: Int): Future[Int] = async {
val f = base(y)
val f2 = base(y + 1)
await(f) + await(f2)
}
def m3(y: Int): Future[Int] = async {
val f = base(y)
var z = 0
if (y > 0) {
z = await(f) + 2
} else {
z = await(f) - 2
}
z
}
def m4(y: Int): Future[Int] = async {
val f = base(y)
val z = if (y > 0) {
await(f) + 2
} else {
await(f) - 2
}
z + 1
}
def futureUnitIfElse(y: Int): Future[Unit] = async {
val f = base(y)
if (y > 0) {
State.result = await(f) + 2
} else {
State.result = await(f) - 2
}
}
}
object State {
@volatile var result: Int = 0
}
@RunWith(classOf[JUnit4])
class AnfTransformSpec {
@Test
def `simple ANF transform`() {
val o = new AnfTestClass
val fut = o.m(10)
val res = Await.result(fut, 2 seconds)
res mustBe (12)
}
@Test
def `simple ANF transform 2`() {
val o = new AnfTestClass
val fut = o.m2(10)
val res = Await.result(fut, 2 seconds)
res mustBe (25)
}
@Test
def `simple ANF transform 3`() {
val o = new AnfTestClass
val fut = o.m3(10)
val res = Await.result(fut, 2 seconds)
res mustBe (14)
}
@Test
def `ANF transform of assigning the result of an if-else`() {
val o = new AnfTestClass
val fut = o.m4(10)
val res = Await.result(fut, 2 seconds)
res mustBe (15)
}
@Test
def `Unit-typed if-else in tail position`() {
val o = new AnfTestClass
val fut = o.futureUnitIfElse(10)
Await.result(fut, 2 seconds)
State.result mustBe (14)
}
@Test
def `inlining block does not produce duplicate definition`() {
import scala.async.AsyncId
AsyncId.async {
val f = 12
val x = AsyncId.await(f)
{
type X = Int
val x: X = 42
println(x)
}
type X = Int
x: X
}
}
@Test
def `inlining block in tail position does not produce duplicate definition`() {
import scala.async.AsyncId
AsyncId.async {
val f = 12
val x = AsyncId.await(f)
{
val x = 42
x
}
} mustBe (42)
}
@Test
def `match as expression 1`() {
import ExecutionContext.Implicits.global
val result = AsyncId.async {
val x = "" match {
case _ => AsyncId.await(1) + 1
}
x
}
result mustBe (2)
}
@Test
def `match as expression 2`() {
import ExecutionContext.Implicits.global
val result = AsyncId.async {
val x = "" match {
case "" if false => AsyncId.await(1) + 1
case _ => 2 + AsyncId.await(1)
}
val y = x
"" match {
case _ => AsyncId.await(y) + 100
}
}
result mustBe (103)
}
@Test
def nestedAwaitAsBareExpression() {
import ExecutionContext.Implicits.global
import _root_.scala.async.AsyncId.{async, await}
val result = async {
await(await("").isEmpty)
}
result mustBe (true)
}
@Test
def nestedAwaitInBlock() {
import ExecutionContext.Implicits.global
import _root_.scala.async.AsyncId.{async, await}
val result = async {
()
await(await("").isEmpty)
}
result mustBe (true)
}
@Test
def nestedAwaitInIf() {
import ExecutionContext.Implicits.global
import _root_.scala.async.AsyncId.{async, await}
val result = async {
if ("".isEmpty)
await(await("").isEmpty)
else 0
}
result mustBe (true)
}
@Test
def byNameExpressionsArentLifted() {
import _root_.scala.async.AsyncId.{async, await}
def foo(ignored: => Any, b: Int) = b
val result = async {
foo(???, await(1))
}
result mustBe (1)
}
@Test
def evaluationOrderRespected() {
import scala.async.AsyncId.{async, await}
def foo(a: Int, b: Int) = (a, b)
val result = async {
var i = 0
def next() = {i += 1; i}
foo(next(), await(next()))
}
result mustBe ((1, 2))
}
}
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