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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.flow
import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import org.junit.Test
import kotlin.concurrent.*
import kotlin.test.*
class CallbackFlowTest : TestBase() {
private class CallbackApi(val block: (SendChannel<Int>) -> Unit) {
var started = false
@Volatile
var stopped = false
lateinit var thread: Thread
fun start(sink: SendChannel<Int>) {
started = true
thread = thread {
while (!stopped) {
block(sink)
}
}
}
fun stop() {
stopped = true
}
}
@Test(timeout = 5_000L)
fun testThrowingConsumer() = runTest {
var i = 0
val api = CallbackApi {
runCatching { it.offer(++i) }
}
val flow = callbackFlow<Int> {
api.start(channel)
awaitClose {
api.stop()
}
}
var receivedConsensus = 0
var isDone = false
var exception: Throwable? = null
val job = flow
.filter { it > 10 }
.launchIn(this) {
onEach {
if (it == 11) {
++receivedConsensus
} else {
receivedConsensus = 42
}
throw RuntimeException()
}
catch<Throwable> { exception = it }
finally { isDone = true }
}
job.join()
assertEquals(1, receivedConsensus)
assertTrue(isDone)
assertTrue { exception is RuntimeException }
api.thread.join()
assertTrue(api.started)
assertTrue(api.stopped)
}
@Test(timeout = 5_000L)
fun testThrowingSource() = runBlocking {
var i = 0
val api = CallbackApi {
if (i < 5) {
it.offer(++i)
} else {
it.close(RuntimeException())
}
}
val flow = callbackFlow<Int>() {
api.start(channel)
awaitClose {
api.stop()
}
}
var received = 0
var isDone = false
var exception: Throwable? = null
val job = flow.launchIn(this) {
onEach { ++received }
catch<Throwable> { exception = it }
finally { isDone = true }
}
job.join()
assertTrue(isDone)
assertTrue { exception is RuntimeException }
api.thread.join()
assertTrue(api.started)
assertTrue(api.stopped)
}
@Test
fun testMergeExample() = runTest {
// Too slow on JS
withContext(Dispatchers.Default) {
val f1 = (1..10_000).asFlow()
val f2 = (10_001..20_000).asFlow()
assertEquals((1..20_000).toSet(), f1.merge(f2).toSet())
}
}
private fun Flow<Int>.merge(other: Flow<Int>): Flow<Int> = channelFlow {
launch {
collect { send(it) }
}
other.collect { send(it) }
}
}
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