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/*
* Copyright (c) 2021 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.compute.failure.models
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.cancel
import kotlinx.coroutines.launch
import org.opendc.compute.failure.hostfault.HostFault
import org.opendc.compute.failure.hostfault.StartStopHostFault
import org.opendc.compute.failure.victimselector.StochasticVictimSelector
import org.opendc.compute.simulator.host.SimHost
import org.opendc.compute.simulator.service.ComputeService
import java.time.InstantSource
import java.util.random.RandomGenerator
import kotlin.coroutines.CoroutineContext
/**
* Factory interface for constructing [FailureModel] for modeling failures of compute service hosts.
*/
public abstract class FailureModel(
context: CoroutineContext,
protected val clock: InstantSource,
protected val service: ComputeService,
protected val random: RandomGenerator,
) : AutoCloseable {
protected val scope: CoroutineScope = CoroutineScope(context + Job())
// TODO: could at some point be extended to different types of faults
protected val fault: HostFault = StartStopHostFault(service)
// TODO: could at some point be extended to different types of victim selectors
protected val victimSelector: StochasticVictimSelector = StochasticVictimSelector(random)
protected val hosts: Set<SimHost> = service.hosts.map { it as SimHost }.toSet()
/**
* The [Job] that awaits the nearest fault in the system.
*/
private var job: Job? = null
/**
* Start the fault injection into the system.
*/
public fun start() {
if (job != null) {
return
}
job =
scope.launch {
runInjector()
job = null
}
}
public abstract suspend fun runInjector()
/**
* Stop the fault injector.
*/
public override fun close() {
scope.cancel()
}
}
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