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/*
* Copyright 2016-2021 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 kotlinx.coroutines.selects.*
import org.junit.*
import org.junit.runner.*
import org.junit.runners.*
import java.util.concurrent.atomic.*
/**
* Tests delivery of events to multiple broadcast channel subscribers.
*/
@RunWith(Parameterized::class)
class BroadcastChannelMultiReceiveStressTest(
private val kind: TestBroadcastChannelKind
) : TestBase() {
companion object {
@Parameterized.Parameters(name = "{0}")
@JvmStatic
fun params(): Collection<Array<Any>> =
TestBroadcastChannelKind.values().map { arrayOf<Any>(it) }
}
private val nReceivers = if (isStressTest) 10 else 5
private val nSeconds = 3 * stressTestMultiplier
private val broadcast = kind.create<Long>()
private val pool = newFixedThreadPoolContext(nReceivers + 1, "BroadcastChannelMultiReceiveStressTest")
private val sentTotal = AtomicLong()
private val receivedTotal = AtomicLong()
private val stopOnReceive = AtomicLong(-1)
private val lastReceived = Array(nReceivers) { AtomicLong(-1) }
@After
fun tearDown() {
pool.close()
}
@Test
fun testStress() = runBlocking {
println("--- BroadcastChannelMultiReceiveStressTest $kind with nReceivers=$nReceivers")
val sender =
launch(pool + CoroutineName("Sender")) {
var i = 0L
while (isActive) {
i++
broadcast.send(i) // could be cancelled
sentTotal.set(i) // only was for it if it was not cancelled
}
}
val receivers = mutableListOf<Job>()
fun printProgress() {
println("Sent ${sentTotal.get()}, received ${receivedTotal.get()}, receivers=${receivers.size}")
}
// ramp up receivers
repeat(nReceivers) {
delay(100) // wait 0.1 sec
val receiverIndex = receivers.size
val name = "Receiver$receiverIndex"
println("Launching $name")
receivers += launch(pool + CoroutineName(name)) {
val channel = broadcast.openSubscription()
when (receiverIndex % 5) {
0 -> doReceive(channel, receiverIndex)
1 -> doReceiveCatching(channel, receiverIndex)
2 -> doIterator(channel, receiverIndex)
3 -> doReceiveSelect(channel, receiverIndex)
4 -> doReceiveCatchingSelect(channel, receiverIndex)
}
channel.cancel()
}
printProgress()
}
// wait
repeat(nSeconds) { _ ->
delay(1000)
printProgress()
}
sender.cancelAndJoin()
println("Tested $kind with nReceivers=$nReceivers")
val total = sentTotal.get()
println(" Sent $total events, waiting for receivers")
stopOnReceive.set(total)
try {
withTimeout(5000) {
receivers.forEachIndexed { index, receiver ->
if (lastReceived[index].get() >= total) receiver.cancel()
receiver.join()
}
}
} catch (e: Exception) {
println("Failed: $e")
pool.dumpThreads("Threads in pool")
receivers.indices.forEach { index ->
println("lastReceived[$index] = ${lastReceived[index].get()}")
}
throw e
}
println(" Received ${receivedTotal.get()} events")
}
private fun doReceived(receiverIndex: Int, i: Long): Boolean {
val last = lastReceived[receiverIndex].get()
check(i > last) { "Last was $last, got $i" }
if (last != -1L && !kind.isConflated)
check(i == last + 1) { "Last was $last, got $i" }
receivedTotal.incrementAndGet()
lastReceived[receiverIndex].set(i)
return i >= stopOnReceive.get()
}
private suspend fun doReceive(channel: ReceiveChannel<Long>, receiverIndex: Int) {
while (true) {
try {
val stop = doReceived(receiverIndex, channel.receive())
if (stop) break
}
catch (ex: ClosedReceiveChannelException) { break }
}
}
private suspend fun doReceiveCatching(channel: ReceiveChannel<Long>, receiverIndex: Int) {
while (true) {
val stop = doReceived(receiverIndex, channel.receiveCatching().getOrNull() ?: break)
if (stop) break
}
}
private suspend fun doIterator(channel: ReceiveChannel<Long>, receiverIndex: Int) {
for (event in channel) {
val stop = doReceived(receiverIndex, event)
if (stop) break
}
}
private suspend fun doReceiveSelect(channel: ReceiveChannel<Long>, receiverIndex: Int) {
while (true) {
try {
val event = select<Long> { channel.onReceive { it } }
val stop = doReceived(receiverIndex, event)
if (stop) break
} catch (ex: ClosedReceiveChannelException) { break }
}
}
private suspend fun doReceiveCatchingSelect(channel: ReceiveChannel<Long>, receiverIndex: Int) {
while (true) {
val event = select<Long?> { channel.onReceiveCatching { it.getOrNull() } } ?: break
val stop = doReceived(receiverIndex, event)
if (stop) break
}
}
}
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