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diff --git a/opendc-harness/src/main/kotlin/org/opendc/harness/engine/ExperimentEngine.kt b/opendc-harness/src/main/kotlin/org/opendc/harness/engine/ExperimentEngine.kt
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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"
+}