/
CoroutineDispatcherTest.kt
147 lines (129 loc) · 3.64 KB
/
CoroutineDispatcherTest.kt
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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.scheduling
import kotlinx.coroutines.*
import org.junit.*
import org.junit.Test
import java.util.concurrent.atomic.*
import kotlin.test.*
class CoroutineDispatcherTest : SchedulerTestBase() {
@After
fun tearDown() {
schedulerTimeSource = NanoTimeSource
}
@Test
fun testSingleThread() = runBlocking {
corePoolSize = 1
expect(1)
withContext(dispatcher) {
require(Thread.currentThread() is CoroutineScheduler.Worker)
expect(2)
val job = async {
expect(3)
delay(10)
expect(4)
}
job.await()
expect(5)
}
finish(6)
checkPoolThreadsCreated(1)
}
@Test
fun testFairScheduling() = runBlocking {
corePoolSize = 1
expect(1)
val outerJob = launch(dispatcher) {
val d1 = launch(dispatcher) { expect(3) }
val d2 = launch(dispatcher) { expect(4) }
val d3 = launch(dispatcher) { expect(2) }
listOf(d1, d2, d3).joinAll()
}
outerJob.join()
finish(5)
}
@Test
fun testStealing() = runBlocking {
corePoolSize = 2
val flag = AtomicBoolean(false)
val job = async(dispatcher) {
expect(1)
val innerJob = async {
expect(2)
flag.set(true)
}
while (!flag.get()) {
Thread.yield() // Block current thread, submitted inner job will be stolen
}
innerJob.await()
expect(3)
}
job.await()
finish(4)
checkPoolThreadsCreated(2)
}
@Test
fun testDelay() = runBlocking {
corePoolSize = 2
withContext(dispatcher) {
expect(1)
delay(10)
expect(2)
}
finish(3)
checkPoolThreadsCreated(2)
}
@Test
fun testMaxSize() = runBlocking {
corePoolSize = 1
maxPoolSize = 4
(1..10).map { launch(blockingDispatcher.value) { Thread.sleep(100) } }.joinAll()
checkPoolThreadsCreated(4)
}
@Test(timeout = 1_000)
fun testYield() = runBlocking {
corePoolSize = 1
maxPoolSize = 1
val outerJob = launch(dispatcher) {
expect(1)
val innerJob = launch(dispatcher) {
// Do nothing
expect(3)
}
expect(2)
while (innerJob.isActive) {
yield()
}
expect(4)
innerJob.join()
}
outerJob.join()
finish(5)
}
@Test
fun testUndispatchedYield() = runTest {
expect(1)
val job = launch(dispatcher, CoroutineStart.UNDISPATCHED) {
expect(2)
yield()
}
expect(3)
job.join()
finish(4)
}
@Test
fun testThreadName() = runBlocking {
val initialCount = Thread.getAllStackTraces().keys.asSequence()
.count { it is CoroutineScheduler.Worker && it.name.contains("SomeTestName") }
assertEquals(0, initialCount)
val dispatcher = ExperimentalCoroutineDispatcher(1, 1, IDLE_WORKER_KEEP_ALIVE_NS, "SomeTestName")
dispatcher.use {
launch(dispatcher) {
}.join()
val count = Thread.getAllStackTraces().keys.asSequence()
.count { it is CoroutineScheduler.Worker && it.name.contains("SomeTestName") }
assertEquals(1, count)
}
}
}