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RejectedExecutionTest.kt
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RejectedExecutionTest.kt
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/*
* Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines
import kotlinx.coroutines.flow.*
import kotlinx.coroutines.scheduling.*
import org.junit.*
import org.junit.Test
import java.util.concurrent.*
import kotlin.test.*
class RejectedExecutionTest : TestBase() {
private val threadName = "RejectedExecutionTest"
private val executor = RejectingExecutor()
@After
fun tearDown() {
executor.shutdown()
executor.awaitTermination(10, TimeUnit.SECONDS)
}
@Test
fun testRejectOnLaunch() = runTest {
expect(1)
val job = launch(executor.asCoroutineDispatcher()) {
expectUnreached()
}
assertEquals(1, executor.submittedTasks)
assertTrue(job.isCancelled)
finish(2)
}
@Test
fun testRejectOnLaunchAtomic() = runTest {
expect(1)
val job = launch(executor.asCoroutineDispatcher(), start = CoroutineStart.ATOMIC) {
expect(2)
assertEquals(true, coroutineContext[Job]?.isCancelled)
assertIoThread() // was rejected on start, but start was atomic
}
assertEquals(1, executor.submittedTasks)
job.join()
finish(3)
}
@Test
fun testRejectOnWithContext() = runTest {
expect(1)
assertFailsWith<CancellationException> {
withContext(executor.asCoroutineDispatcher()) {
expectUnreached()
}
}
assertEquals(1, executor.submittedTasks)
finish(2)
}
@Test
fun testRejectOnResumeInContext() = runTest {
expect(1)
executor.acceptTasks = 1 // accept one task
assertFailsWith<CancellationException> {
withContext(executor.asCoroutineDispatcher()) {
expect(2)
assertExecutorThread()
try {
withContext(Dispatchers.Default) {
expect(3)
assertDefaultDispatcherThread()
// We have to wait until caller executor thread had already suspended (if not running task),
// so that we resume back to it a new task is posted
executor.awaitNotRunningTask()
expect(4)
assertDefaultDispatcherThread()
}
// cancelled on resume back
} finally {
expect(5)
assertIoThread()
}
expectUnreached()
}
}
assertEquals(2, executor.submittedTasks)
finish(6)
}
@Test
fun testRejectOnDelay() = runTest {
expect(1)
executor.acceptTasks = 1 // accept one task
assertFailsWith<CancellationException> {
withContext(executor.asCoroutineDispatcher()) {
expect(2)
assertExecutorThread()
try {
delay(10) // cancelled
} finally {
// Since it was cancelled on attempt to delay, it still stays on the same thread
assertExecutorThread()
}
expectUnreached()
}
}
assertEquals(2, executor.submittedTasks)
finish(3)
}
@Test
fun testRejectWithTimeout() = runTest {
expect(1)
executor.acceptTasks = 1 // accept one task
assertFailsWith<CancellationException> {
withContext(executor.asCoroutineDispatcher()) {
expect(2)
assertExecutorThread()
withTimeout(1000) {
expect(3) // atomic entry into the block (legacy behavior, it seem to be Ok with way)
assertEquals(true, coroutineContext[Job]?.isCancelled) // but the job is already cancelled
}
expectUnreached()
}
}
assertEquals(2, executor.submittedTasks)
finish(4)
}
private inner class RejectingExecutor : ScheduledThreadPoolExecutor(1, { r -> Thread(r, threadName) }) {
var acceptTasks = 0
var submittedTasks = 0
val runningTask = MutableStateFlow(false)
override fun schedule(command: Runnable, delay: Long, unit: TimeUnit): ScheduledFuture<*> {
submittedTasks++
if (submittedTasks > acceptTasks) throw RejectedExecutionException()
val wrapper = Runnable {
runningTask.value = true
try {
command.run()
} finally {
runningTask.value = false
}
}
return super.schedule(wrapper, delay, unit)
}
suspend fun awaitNotRunningTask() = runningTask.first { !it }
}
private fun assertExecutorThread() {
val thread = Thread.currentThread()
if (!thread.name.startsWith(threadName)) error("Not an executor thread: $thread")
}
private fun assertDefaultDispatcherThread() {
val thread = Thread.currentThread()
if (thread !is CoroutineScheduler.Worker) error("Not a thread from Dispatchers.Default: $thread")
assertEquals(CoroutineScheduler.WorkerState.CPU_ACQUIRED, thread.state)
}
private fun assertIoThread() {
val thread = Thread.currentThread()
if (thread !is CoroutineScheduler.Worker) error("Not a thread from Dispatchers.IO: $thread")
assertEquals(CoroutineScheduler.WorkerState.BLOCKING, thread.state)
}
}