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/*
* Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.reactive
import kotlinx.coroutines.*
import kotlinx.coroutines.CancellationException
import kotlinx.coroutines.flow.*
import org.junit.Test
import org.reactivestreams.*
import java.util.concurrent.*
import kotlin.test.*
class FlowAsPublisherTest : TestBase() {
@Test
fun testErrorOnCancellationIsReported() {
expect(1)
flow {
try {
emit(2)
} finally {
expect(3)
throw TestException()
}
}.asPublisher().subscribe(object : Subscriber<Int> {
private lateinit var subscription: Subscription
override fun onComplete() {
expectUnreached()
}
override fun onSubscribe(s: Subscription?) {
subscription = s!!
subscription.request(2)
}
override fun onNext(t: Int) {
expect(t)
subscription.cancel()
}
override fun onError(t: Throwable?) {
assertTrue(t is TestException)
expect(4)
}
})
finish(5)
}
@Test
fun testCancellationIsNotReported() {
expect(1)
flow {
emit(2)
}.asPublisher().subscribe(object : Subscriber<Int> {
private lateinit var subscription: Subscription
override fun onComplete() {
expectUnreached()
}
override fun onSubscribe(s: Subscription?) {
subscription = s!!
subscription.request(2)
}
override fun onNext(t: Int) {
expect(t)
subscription.cancel()
}
override fun onError(t: Throwable?) {
expectUnreached()
}
})
finish(3)
}
@Test
fun testUnconfinedDefaultContext() {
expect(1)
val thread = Thread.currentThread()
fun checkThread() {
assertSame(thread, Thread.currentThread())
}
flowOf(42).asPublisher().subscribe(object : Subscriber<Int> {
private lateinit var subscription: Subscription
override fun onSubscribe(s: Subscription) {
expect(2)
subscription = s
subscription.request(2)
}
override fun onNext(t: Int) {
checkThread()
expect(3)
assertEquals(42, t)
}
override fun onComplete() {
checkThread()
expect(4)
}
override fun onError(t: Throwable?) {
expectUnreached()
}
})
finish(5)
}
@Test
fun testConfinedContext() {
expect(1)
val threadName = "FlowAsPublisherTest.testConfinedContext"
fun checkThread() {
val currentThread = Thread.currentThread()
assertTrue(currentThread.name.startsWith(threadName), "Unexpected thread $currentThread")
}
val completed = CountDownLatch(1)
newSingleThreadContext(threadName).use { dispatcher ->
flowOf(42).asPublisher(dispatcher).subscribe(object : Subscriber<Int> {
private lateinit var subscription: Subscription
override fun onSubscribe(s: Subscription) {
expect(2)
subscription = s
subscription.request(2)
}
override fun onNext(t: Int) {
checkThread()
expect(3)
assertEquals(42, t)
}
override fun onComplete() {
checkThread()
expect(4)
completed.countDown()
}
override fun onError(t: Throwable?) {
expectUnreached()
}
})
completed.await()
}
finish(5)
}
@Test
fun testFlowWithTimeout() = runTest {
val publisher = flow<Int> {
expect(2)
withTimeout(1) { delay(Long.MAX_VALUE) }
}.asPublisher()
try {
expect(1)
publisher.awaitFirstOrNull()
} catch (e: CancellationException) {
expect(3)
}
finish(4)
}
}
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