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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 kotlinx.coroutines.selects.*
import org.junit.Test
import org.junit.runner.*
import org.junit.runners.*
import kotlin.test.*
@RunWith(Parameterized::class)
class TickerChannelCommonTest(private val channelFactory: Channel) : TestBase() {
companion object {
@Parameterized.Parameters(name = "{0}")
@JvmStatic
fun params(): Collection<Array<Any>> =
Channel.values().map { arrayOf<Any>(it) }
}
enum class Channel {
FIXED_PERIOD {
override fun invoke(delay: Long, initialDelay: Long) =
ticker(delay, initialDelayMillis = initialDelay, mode = TickerMode.FIXED_PERIOD)
},
FIXED_DELAY {
override fun invoke(delay: Long, initialDelay: Long) =
ticker(delay, initialDelayMillis = initialDelay, mode = TickerMode.FIXED_DELAY)
};
abstract operator fun invoke(delay: Long, initialDelay: Long = 0): ReceiveChannel<Unit>
}
@Test
fun testDelay() = withVirtualTimeSource {
runTest {
val delayChannel = channelFactory(delay = 10000)
delayChannel.checkNotEmpty()
delayChannel.checkEmpty()
delay(5000)
delayChannel.checkEmpty()
delay(5100)
delayChannel.checkNotEmpty()
delayChannel.cancel()
delay(5100)
assertFailsWith<CancellationException> { delayChannel.poll() }
}
}
@Test
fun testInitialDelay() = withVirtualTimeSource {
runTest {
val delayChannel = channelFactory(initialDelay = 750, delay = 1000)
delayChannel.checkEmpty()
delay(500)
delayChannel.checkEmpty()
delay(300)
delayChannel.checkNotEmpty()
// Regular delay
delay(750)
delayChannel.checkEmpty()
delay(260)
delayChannel.checkNotEmpty()
delayChannel.cancel()
}
}
@Test
fun testReceive() = withVirtualTimeSource {
runTest {
val delayChannel = channelFactory(delay = 1000)
delayChannel.checkNotEmpty()
var value = withTimeoutOrNull(750) {
delayChannel.receive()
1
}
assertNull(value)
value = withTimeoutOrNull(260) {
delayChannel.receive()
1
}
assertNotNull(value)
delayChannel.cancel()
}
}
@Test
fun testComplexOperator() = withVirtualTimeSource {
runTest {
val producer = GlobalScope.produce {
for (i in 1..7) {
send(i)
delay(1000)
}
}
val averages = producer.averageInTimeWindow(3000).toList()
assertEquals(listOf(2.0, 5.0, 7.0), averages)
}
}
private fun ReceiveChannel<Int>.averageInTimeWindow(timespan: Long) = GlobalScope.produce {
val delayChannel = channelFactory(delay = timespan, initialDelay = timespan)
var sum = 0
var n = 0
whileSelect {
this@averageInTimeWindow.onReceiveOrClosed {
if (it.isClosed) {
// Send leftovers and bail out
if (n != 0) send(sum / n.toDouble())
false
} else {
sum += it.value
++n
true
}
}
// Timeout, send aggregated average and reset counters
delayChannel.onReceive {
send(sum / n.toDouble())
sum = 0
n = 0
true
}
}
delayChannel.cancel()
}
@Test
fun testStress() = runTest {
// No OOM/SOE
val iterations = 100_000 * stressTestMultiplier
val delayChannel = channelFactory(0)
repeat(iterations) {
delayChannel.receive()
}
delayChannel.cancel()
}
@Test(expected = IllegalArgumentException::class)
fun testNegativeDelay() {
channelFactory(-1)
}
@Test(expected = IllegalArgumentException::class)
fun testNegativeInitialDelay() {
channelFactory(initialDelay = -1, delay = 100)
}
}
fun ReceiveChannel<Unit>.checkEmpty() = assertNull(poll())
fun ReceiveChannel<Unit>.checkNotEmpty() {
assertNotNull(poll())
assertNull(poll())
}
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