| /* |
| * 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) |
| 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() |
| finish(10) |
| } |
| |
| @Test |
| fun testClosedReceiveOrNull() = runTest { |
| val q = Channel<Int>(Channel.RENDEZVOUS) |
| check(!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.isClosedForSend && q.isClosedForReceive) |
| yield() |
| check(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 TestCancellationException }) { |
| val channel = Channel<Int>(Channel.RENDEZVOUS) |
| channel.cancel(TestCancellationException()) |
| channel.receiveOrNull() |
| } |
| } |