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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 ConflatedBroadcastChannelTest : TestBase() {
@Test
fun testConcurrentModification() = runTest {
val channel = ConflatedBroadcastChannel<Int>()
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 testBasicScenario() = runTest {
expect(1)
val broadcast = ConflatedBroadcastChannel<String>()
assertTrue(exceptionFrom { broadcast.value } is IllegalStateException)
assertNull(broadcast.valueOrNull)
launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
val sub = broadcast.openSubscription()
assertNull(sub.poll())
expect(3)
assertEquals("one", sub.receive()) // suspends
expect(6)
assertEquals("two", sub.receive()) // suspends
expect(12)
sub.cancel()
expect(13)
}
expect(4)
broadcast.send("one") // does not suspend
assertEquals("one", broadcast.value)
assertEquals("one", broadcast.valueOrNull)
expect(5)
yield() // to receiver
expect(7)
launch(start = CoroutineStart.UNDISPATCHED) {
expect(8)
val sub = broadcast.openSubscription()
assertEquals("one", sub.receive()) // does not suspend
expect(9)
assertEquals("two", sub.receive()) // suspends
expect(14)
assertEquals("three", sub.receive()) // suspends
expect(17)
assertNull(sub.receiveOrNull()) // suspends until closed
expect(20)
sub.cancel()
expect(21)
}
expect(10)
broadcast.send("two") // does not suspend
assertEquals("two", broadcast.value)
assertEquals("two", broadcast.valueOrNull)
expect(11)
yield() // to both receivers
expect(15)
broadcast.send("three") // does not suspend
assertEquals("three", broadcast.value)
assertEquals("three", broadcast.valueOrNull)
expect(16)
yield() // to second receiver
expect(18)
broadcast.close()
assertTrue(exceptionFrom { broadcast.value } is IllegalStateException)
assertNull(broadcast.valueOrNull)
expect(19)
yield() // to second receiver
assertTrue(exceptionFrom { broadcast.send("four") } is ClosedSendChannelException)
finish(22)
}
@Test
fun testInitialValueAndReceiveClosed() = runTest {
expect(1)
val broadcast = ConflatedBroadcastChannel(1)
assertEquals(1, broadcast.value)
assertEquals(1, broadcast.valueOrNull)
launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
val sub = broadcast.openSubscription()
assertEquals(1, sub.receive())
expect(3)
assertTrue(exceptionFrom { sub.receive() } is ClosedReceiveChannelException) // suspends
expect(6)
}
expect(4)
broadcast.close()
expect(5)
yield() // to child
finish(7)
}
private inline fun exceptionFrom(block: () -> Unit): Throwable? {
return try {
block()
null
} catch (e: Throwable) {
e
}
}
}
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