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/*
* Copyright (c) 2022 AtLarge Research
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.opendc.common
import kotlinx.coroutines.CancellableContinuation
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.Delay
import kotlinx.coroutines.DisposableHandle
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.InternalCoroutinesApi
import kotlin.coroutines.CoroutineContext
/**
* A [CoroutineDispatcher] that uses a [Dispatcher] to dispatch pending co-routines.
*
* @param dispatcher The [Dispatcher] used to manage the execution of future tasks.
*/
@OptIn(InternalCoroutinesApi::class)
internal class DispatcherCoroutineDispatcher(private val dispatcher: Dispatcher) : CoroutineDispatcher(), Delay, DispatcherProvider {
override fun dispatch(
context: CoroutineContext,
block: Runnable,
) {
block.run()
}
override fun dispatchYield(
context: CoroutineContext,
block: Runnable,
) {
dispatcher.schedule(block)
}
@OptIn(ExperimentalCoroutinesApi::class)
override fun scheduleResumeAfterDelay(
timeMillis: Long,
continuation: CancellableContinuation<Unit>,
) {
dispatcher.schedule(timeMillis, CancellableContinuationRunnable(continuation) { resumeUndispatched(Unit) })
}
override fun invokeOnTimeout(
timeMillis: Long,
block: Runnable,
context: CoroutineContext,
): DisposableHandle {
val handle = dispatcher.scheduleCancellable(timeMillis, block)
return DisposableHandle { handle.cancel() }
}
override fun getDispatcher(): Dispatcher = dispatcher
override fun toString(): String {
return "DispatcherCoroutineDispatcher[dispatcher=$dispatcher]"
}
/**
* This class exists to allow cleanup code to avoid throwing for cancelled continuations scheduled
* in the future.
*/
private class CancellableContinuationRunnable<T>(
@JvmField val continuation: CancellableContinuation<T>,
private val block: CancellableContinuation<T>.() -> Unit,
) : Runnable {
override fun run() = continuation.block()
}
}
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