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77
...pute-failure/src/main/kotlin/org/opendc/compute/failure/models/SampleBasedFailureModel.kt
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| /* | ||
| * Copyright (c) 2024 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.delay | ||
| import org.apache.commons.math3.distribution.RealDistribution | ||
| import org.opendc.compute.service.ComputeService | ||
| import java.time.InstantSource | ||
| import java.util.random.RandomGenerator | ||
| import kotlin.coroutines.CoroutineContext | ||
| import kotlin.math.max | ||
| import kotlin.math.min | ||
| import kotlin.math.roundToLong | ||
|
|
||
| /** | ||
| * Sample based failure model | ||
| * | ||
| * @property context | ||
| * @property clock | ||
| * @property service | ||
| * @property random | ||
| * @property iatSampler A distribution from which the time until the next fault is sampled in ms | ||
| * @property durationSampler A distribution from which the duration of a fault is sampled in s | ||
| * @property nohSampler A distribution from which the number of hosts that fault is sampled. | ||
| */ | ||
| public class SampleBasedFailureModel( | ||
| context: CoroutineContext, | ||
| clock: InstantSource, | ||
| service: ComputeService, | ||
| random: RandomGenerator, | ||
| private val iatSampler: RealDistribution, | ||
| private val durationSampler: RealDistribution, | ||
| private val nohSampler: RealDistribution, | ||
| ) : FailureModel(context, clock, service, random) { | ||
| override suspend fun runInjector() { | ||
| while (true) { | ||
| val iatSample = max(0.0, iatSampler.sample()) | ||
| val intervalDuration = (iatSample * 3.6e6).roundToLong() | ||
|
|
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| // Handle long overflow | ||
| if (clock.millis() + intervalDuration <= 0) { | ||
| return | ||
| } | ||
|
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| delay(intervalDuration) | ||
|
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| val numberOfHosts = min(1.0, max(0.0, nohSampler.sample())) | ||
| val victims = victimSelector.select(hosts, numberOfHosts) | ||
|
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| val durationSample = max(0.0, durationSampler.sample()) | ||
| val faultDuration = (durationSample * 3.6e6).toLong() | ||
| fault.apply(victims, faultDuration) | ||
|
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||
| break | ||
| } | ||
| } | ||
| } |
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