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/*
* Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.channels
import kotlinx.coroutines.*
import kotlin.test.*
class RendezvousChannelTest : TestBase() {
@Test
fun testSimple() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
check(q.isEmpty && q.isFull)
expect(1)
val sender = launch {
expect(4)
q.send(1) // suspend -- the first to come to rendezvous
expect(7)
q.send(2) // does not suspend -- receiver is there
expect(8)
}
expect(2)
val receiver = launch {
expect(5)
check(q.receive() == 1) // does not suspend -- sender was there
expect(6)
check(q.receive() == 2) // suspends
expect(9)
}
expect(3)
sender.join()
receiver.join()
check(q.isEmpty && q.isFull)
finish(10)
}
@Test
fun testClosedReceiveOrNull() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
check(q.isEmpty && q.isFull && !q.isClosedForSend && !q.isClosedForReceive)
expect(1)
launch {
expect(3)
assertEquals(42, q.receiveOrNull())
expect(4)
assertEquals(null, q.receiveOrNull())
expect(6)
}
expect(2)
q.send(42)
expect(5)
q.close()
check(!q.isEmpty && !q.isFull && q.isClosedForSend && q.isClosedForReceive)
yield()
check(!q.isEmpty && !q.isFull && q.isClosedForSend && q.isClosedForReceive)
finish(7)
}
@Test
fun testClosedExceptions() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(4)
try { q.receive() }
catch (e: ClosedReceiveChannelException) {
expect(5)
}
}
expect(2)
q.close()
expect(3)
yield()
expect(6)
try { q.send(42) }
catch (e: ClosedSendChannelException) {
finish(7)
}
}
@Test
fun testOfferAndPool() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
assertFalse(q.offer(1))
expect(1)
launch {
expect(3)
assertEquals(null, q.poll())
expect(4)
assertEquals(2, q.receive())
expect(7)
assertEquals(null, q.poll())
yield()
expect(9)
assertEquals(3, q.poll())
expect(10)
}
expect(2)
yield()
expect(5)
assertTrue(q.offer(2))
expect(6)
yield()
expect(8)
q.send(3)
finish(11)
}
@Test
fun testIteratorClosed() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(3)
q.close()
expect(4)
}
expect(2)
for (x in q) {
expectUnreached()
}
finish(5)
}
@Test
fun testIteratorOne() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(3)
q.send(1)
expect(4)
q.close()
expect(5)
}
expect(2)
for (x in q) {
expect(6)
assertEquals(1, x)
}
finish(7)
}
@Test
fun testIteratorOneWithYield() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(3)
q.send(1) // will suspend
expect(6)
q.close()
expect(7)
}
expect(2)
yield() // yield to sender coroutine right before starting for loop
expect(4)
for (x in q) {
expect(5)
assertEquals(1, x)
}
finish(8)
}
@Test
fun testIteratorTwo() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(3)
q.send(1)
expect(4)
q.send(2)
expect(7)
q.close()
expect(8)
}
expect(2)
for (x in q) {
when (x) {
1 -> expect(5)
2 -> expect(6)
else -> expectUnreached()
}
}
finish(9)
}
@Test
fun testIteratorTwoWithYield() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(3)
q.send(1) // will suspend
expect(6)
q.send(2)
expect(7)
q.close()
expect(8)
}
expect(2)
yield() // yield to sender coroutine right before starting for loop
expect(4)
for (x in q) {
when (x) {
1 -> expect(5)
2 -> expect(9)
else -> expectUnreached()
}
}
finish(10)
}
@Test
fun testSuspendSendOnClosedChannel() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
expect(1)
launch {
expect(4)
q.send(42) // suspend
expect(11)
}
expect(2)
launch {
expect(5)
q.close()
expect(6)
}
expect(3)
yield() // to sender
expect(7)
yield() // try to resume sender (it will not resume despite the close!)
expect(8)
assertEquals(42, q.receiveOrNull())
expect(9)
assertNull(q.receiveOrNull())
expect(10)
yield() // to sender, it was resumed!
finish(12)
}
class BadClass {
override fun equals(other: Any?): Boolean = error("equals")
override fun hashCode(): Int = error("hashCode")
override fun toString(): String = error("toString")
}
@Test
fun testProduceBadClass() = runTest {
val bad = BadClass()
val c = produce {
expect(1)
send(bad)
}
assertTrue(c.receive() === bad)
finish(2)
}
@Test
fun testConsumeAll() = runTest {
val q = Channel<Int>(Channel.RENDEZVOUS)
for (i in 1..10) {
launch(start = CoroutineStart.UNDISPATCHED) {
expect(i)
q.send(i) // suspends
expectUnreached() // will get cancelled by cancel
}
}
expect(11)
q.cancel()
check(q.isClosedForSend)
check(q.isClosedForReceive)
check(q.receiveOrNull() == null)
finish(12)
}
@Test
fun testCancelWithCause() = runTest({ it is TestException }) {
val channel = Channel<Int>(Channel.RENDEZVOUS)
channel.cancel(TestException())
channel.receiveOrNull()
}
}
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