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kotlinx-coroutines-core/jsAndWasmShared/src/internal/JSDispatcher.kt
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| /* | ||
| * Copyright 2016-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
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| package kotlinx.coroutines | ||
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| import kotlinx.coroutines.internal.* | ||
| import org.w3c.dom.* | ||
| import kotlin.coroutines.* | ||
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| private const val MAX_DELAY = Int.MAX_VALUE.toLong() | ||
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| private fun delayToInt(timeMillis: Long): Int = | ||
| timeMillis.coerceIn(0, MAX_DELAY).toInt() | ||
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| internal sealed class SetTimeoutBasedDispatcher: CoroutineDispatcher(), Delay { | ||
| val messageQueue = ScheduledMessageQueue(this) | ||
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| abstract fun scheduleQueueProcessing() | ||
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| override fun limitedParallelism(parallelism: Int): CoroutineDispatcher { | ||
| parallelism.checkParallelism() | ||
| return this | ||
| } | ||
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| override fun dispatch(context: CoroutineContext, block: Runnable) { | ||
| messageQueue.enqueue(block) | ||
| } | ||
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| override fun invokeOnTimeout(timeMillis: Long, block: Runnable, context: CoroutineContext): DisposableHandle { | ||
| val handle = setTimeout({ block.run() }, delayToInt(timeMillis)) | ||
| return ClearTimeout(handle) | ||
| } | ||
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| override fun scheduleResumeAfterDelay(timeMillis: Long, continuation: CancellableContinuation<Unit>) { | ||
| val handle = setTimeout({ with(continuation) { resumeUndispatched(Unit) } }, delayToInt(timeMillis)) | ||
| continuation.invokeOnCancellation(handler = ClearTimeout(handle).asHandler) | ||
| } | ||
| } | ||
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| internal class WindowDispatcher(private val window: Window) : CoroutineDispatcher(), Delay { | ||
| private val queue = WindowMessageQueue(window) | ||
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| override fun dispatch(context: CoroutineContext, block: Runnable) = queue.enqueue(block) | ||
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| override fun scheduleResumeAfterDelay(timeMillis: Long, continuation: CancellableContinuation<Unit>) { | ||
| val handle = setTimeout(window, { with(continuation) { resumeUndispatched(Unit) } }, delayToInt(timeMillis)) | ||
| continuation.invokeOnCancellation(handler = WindowClearTimeout(handle).asHandler) | ||
| } | ||
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| override fun invokeOnTimeout(timeMillis: Long, block: Runnable, context: CoroutineContext): DisposableHandle { | ||
| val handle = setTimeout(window, block::run, delayToInt(timeMillis)) | ||
| return WindowClearTimeout(handle) | ||
| } | ||
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| private inner class WindowClearTimeout(handle: Int) : ClearTimeout(handle) { | ||
| override fun dispose() { | ||
| window.clearTimeout(handle) | ||
| } | ||
| } | ||
| } | ||
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| internal object SetTimeoutDispatcher : SetTimeoutBasedDispatcher() { | ||
| override fun scheduleQueueProcessing() { | ||
| setTimeout(messageQueue.processQueue, 0) | ||
| } | ||
| } | ||
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| private open class ClearTimeout(protected val handle: Int) : CancelHandler(), DisposableHandle { | ||
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| override fun dispose() { | ||
| clearTimeout(handle) | ||
| } | ||
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| override fun invoke(cause: Throwable?) { | ||
| dispose() | ||
| } | ||
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| override fun toString(): String = "ClearTimeout[$handle]" | ||
| } | ||
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| /** | ||
| * An abstraction over JS scheduling mechanism that leverages micro-batching of dispatched blocks without | ||
| * paying the cost of JS callbacks scheduling on every dispatch. | ||
| * | ||
| * Queue uses two scheduling mechanisms: | ||
| * 1) [schedule] is used to schedule the initial processing of the message queue. | ||
| * JS engine-specific microtask mechanism is used in order to boost performance on short runs and a dispatch batch | ||
| * 2) [reschedule] is used to schedule processing of the queue after yield to the JS event loop. | ||
| * JS engine-specific macrotask mechanism is used not to starve animations and non-coroutines macrotasks. | ||
| * | ||
| * Yet there could be a long tail of "slow" reschedules, but it should be amortized by the queue size. | ||
| */ | ||
| internal abstract class MessageQueue : MutableList<Runnable> by ArrayDeque() { | ||
| val yieldEvery = 16 // yield to JS macrotask event loop after this many processed messages | ||
| private var scheduled = false | ||
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| abstract fun schedule() | ||
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| abstract fun reschedule() | ||
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| fun enqueue(element: Runnable) { | ||
| add(element) | ||
| if (!scheduled) { | ||
| scheduled = true | ||
| schedule() | ||
| } | ||
| } | ||
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| fun process() { | ||
| try { | ||
| // limit number of processed messages | ||
| repeat(yieldEvery) { | ||
| val element = removeFirstOrNull() ?: return@process | ||
| element.run() | ||
| } | ||
| } finally { | ||
| if (isEmpty()) { | ||
| scheduled = false | ||
| } else { | ||
| reschedule() | ||
| } | ||
| } | ||
| } | ||
| } |
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