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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.harness.engine
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.asFlow
import kotlinx.coroutines.flow.buffer
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.flow.map
import org.opendc.harness.api.ExperimentDefinition
import org.opendc.harness.api.Trial
import org.opendc.harness.engine.scheduler.ExperimentScheduler
import org.opendc.harness.engine.strategy.ExperimentStrategy
/**
* The [ExperimentEngine] orchestrates the execution of experiments.
*
* @property strategy The [ExperimentStrategy] used to explore the experiment design space.
* @property scheduler The [ExperimentScheduler] to schedule the trials over compute resources.
* @property listener The [ExperimentExecutionListener] to observe the progress.
* @property repeats The number of repeats to perform.
*/
public class ExperimentEngine(
private val strategy: ExperimentStrategy,
private val scheduler: ExperimentScheduler,
private val listener: ExperimentExecutionListener,
private val repeats: Int
) {
/**
* Execute the specified [experiment][root].
*
* @param root The experiment to execute.
*/
public suspend fun execute(root: ExperimentDefinition) {
listener.experimentStarted(root)
try {
supervisorScope {
strategy.generate(root)
.asFlow()
.map { scenario ->
listener.scenarioStarted(scenario)
scenario
}
.buffer(100)
.collect { scenario ->
launch {
val jobs = (0 until repeats).map { repeat ->
val worker = scheduler.allocate()
launch {
val trial = Trial(scenario, repeat)
try {
listener.trialStarted(trial)
worker.dispatch(trial)
listener.trialFinished(trial, null)
} catch (e: Throwable) {
listener.trialFinished(trial, e)
throw e
}
}
}
try {
jobs.joinAll()
listener.scenarioFinished(scenario, null)
} catch (e: CancellationException) {
listener.scenarioFinished(scenario, null)
throw e
} catch (e: Throwable) {
listener.scenarioFinished(scenario, e)
}
}
}
}
listener.experimentFinished(root, null)
} catch (e: Throwable) {
listener.experimentFinished(root, e)
throw e
}
}
override fun toString(): String = "ExperimentEngine"
}
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