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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 ArrayBroadcastChannelTest : TestBase() {
@Test
fun testConcurrentModification() = runTest {
val channel = BroadcastChannel<Int>(1)
val s1 = channel.openSubscription()
val s2 = channel.openSubscription()
val job1 = launch(Dispatchers.Unconfined, CoroutineStart.UNDISPATCHED) {
expect(1)
s1.receive()
s1.cancel()
}
val job2 = launch(Dispatchers.Unconfined, CoroutineStart.UNDISPATCHED) {
expect(2)
s2.receive()
}
expect(3)
channel.send(1)
joinAll(job1, job2)
finish(4)
}
@Test
fun testBasic() = runTest {
expect(1)
val broadcast = BroadcastChannel<Int>(1)
assertFalse(broadcast.isClosedForSend)
val first = broadcast.openSubscription()
launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
assertEquals(1, first.receive()) // suspends
assertFalse(first.isClosedForReceive)
expect(5)
assertEquals(2, first.receive()) // suspends
assertFalse(first.isClosedForReceive)
expect(10)
assertNull(first.receiveOrNull()) // suspends
assertTrue(first.isClosedForReceive)
expect(14)
}
expect(3)
broadcast.send(1)
expect(4)
yield() // to the first receiver
expect(6)
val second = broadcast.openSubscription()
launch(start = CoroutineStart.UNDISPATCHED) {
expect(7)
assertEquals(2, second.receive()) // suspends
assertFalse(second.isClosedForReceive)
expect(11)
assertNull(second.receiveOrNull()) // suspends
assertTrue(second.isClosedForReceive)
expect(15)
}
expect(8)
broadcast.send(2)
expect(9)
yield() // to first & second receivers
expect(12)
broadcast.close()
expect(13)
assertTrue(broadcast.isClosedForSend)
yield() // to first & second receivers
finish(16)
}
@Test
fun testSendSuspend() = runTest {
expect(1)
val broadcast = BroadcastChannel<Int>(1)
val first = broadcast.openSubscription()
launch {
expect(4)
assertEquals(1, first.receive())
expect(5)
assertEquals(2, first.receive())
expect(6)
}
expect(2)
broadcast.send(1) // puts to buffer, receiver not running yet
expect(3)
broadcast.send(2) // suspends
finish(7)
}
@Test
fun testConcurrentSendCompletion() = runTest {
expect(1)
val broadcast = BroadcastChannel<Int>(1)
val sub = broadcast.openSubscription()
// launch 3 concurrent senders (one goes buffer, two other suspend)
for (x in 1..3) {
launch(start = CoroutineStart.UNDISPATCHED) {
expect(x + 1)
broadcast.send(x)
}
}
// and close it for send
expect(5)
broadcast.close()
// now must receive all 3 items
expect(6)
assertFalse(sub.isClosedForReceive)
for (x in 1..3)
assertEquals(x, sub.receiveOrNull())
// and receive close signal
assertNull(sub.receiveOrNull())
assertTrue(sub.isClosedForReceive)
finish(7)
}
@Test
fun testForgetUnsubscribed() = runTest {
expect(1)
val broadcast = BroadcastChannel<Int>(1)
broadcast.send(1)
broadcast.send(2)
broadcast.send(3)
expect(2) // should not suspend anywhere above
val sub = broadcast.openSubscription()
launch(start = CoroutineStart.UNDISPATCHED) {
expect(3)
assertEquals(4, sub.receive()) // suspends
expect(5)
}
expect(4)
broadcast.send(4) // sends
yield()
finish(6)
}
@Test
fun testReceiveFullAfterClose() = runTest {
val channel = BroadcastChannel<Int>(10)
val sub = channel.openSubscription()
// generate into buffer & close
for (x in 1..5) channel.send(x)
channel.close()
// make sure all of them are consumed
check(!sub.isClosedForReceive)
for (x in 1..5) check(sub.receive() == x)
check(sub.receiveOrNull() == null)
check(sub.isClosedForReceive)
}
@Test
fun testCloseSubDuringIteration() = runTest {
val channel = BroadcastChannel<Int>(1)
// launch generator (for later) in this context
launch {
for (x in 1..5) {
channel.send(x)
}
channel.close()
}
// start consuming
val sub = channel.openSubscription()
var expected = 0
assertFailsWith<CancellationException> {
sub.consumeEach {
check(it == ++expected)
if (it == 2) {
sub.cancel()
}
}
}
check(expected == 2)
}
@Test
fun testReceiveFromCancelledSub() = runTest {
val channel = BroadcastChannel<Int>(1)
val sub = channel.openSubscription()
assertFalse(sub.isClosedForReceive)
sub.cancel()
assertTrue(sub.isClosedForReceive)
assertFailsWith<CancellationException> { sub.receive() }
}
@Test
fun testCancelWithCause() = runTest({ it is TestCancellationException }) {
val channel = BroadcastChannel<Int>(1)
val subscription = channel.openSubscription()
subscription.cancel(TestCancellationException())
subscription.receiveOrNull()
}
@Test
fun testReceiveNoneAfterCancel() = runTest {
val channel = BroadcastChannel<Int>(10)
val sub = channel.openSubscription()
// generate into buffer & cancel
for (x in 1..5) channel.send(x)
channel.cancel()
assertTrue(channel.isClosedForSend)
assertTrue(sub.isClosedForReceive)
check(sub.receiveOrNull() == null)
}
}
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