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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.flow.Flow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.runBlocking
+import org.opendc.harness.api.ExperimentDefinition
+import org.opendc.harness.engine.scheduler.ExperimentScheduler
+import org.opendc.harness.engine.scheduler.ThreadPoolExperimentScheduler
+import org.opendc.harness.engine.strategy.CartesianExperimentStrategy
+import org.opendc.harness.engine.strategy.ExperimentStrategy
+import org.opendc.harness.internal.CompositeExperimentExecutionListener
+
+/**
+ * A builder class for conducting experiments via the [ExperimentEngine].
+ */
+public class ExperimentEngineLauncher private constructor(
+ private val strategy: ExperimentStrategy?,
+ private val scheduler: ExperimentScheduler?,
+ private val listeners: List<ExperimentExecutionListener>,
+ private val repeats: Int
+) {
+ /**
+ * Construct an [ExperimentEngineLauncher] instance.
+ */
+ public constructor() : this(null, null, emptyList(), 1)
+
+ /**
+ * Create an [ExperimentEngineLauncher] with the specified [strategy].
+ */
+ public fun withScheduler(strategy: ExperimentStrategy): ExperimentEngineLauncher {
+ return ExperimentEngineLauncher(strategy, scheduler, listeners, repeats)
+ }
+
+ /**
+ * Create an [ExperimentEngineLauncher] with the specified [scheduler].
+ */
+ public fun withScheduler(scheduler: ExperimentScheduler): ExperimentEngineLauncher {
+ return ExperimentEngineLauncher(strategy, scheduler, listeners, repeats)
+ }
+
+ /**
+ * Create an [ExperimentEngineLauncher] with the specified [listener] added.
+ */
+ public fun withListener(listener: ExperimentExecutionListener): ExperimentEngineLauncher {
+ return ExperimentEngineLauncher(strategy, scheduler, listeners + listener, repeats)
+ }
+
+ /**
+ * Create an [ExperimentEngineLauncher] with the specified number of repeats.
+ */
+ public fun withRepeats(repeats: Int): ExperimentEngineLauncher {
+ require(repeats > 0) { "Invalid number of repeats; must be greater than zero. " }
+ return ExperimentEngineLauncher(strategy, scheduler, listeners, repeats)
+ }
+
+ /**
+ * Launch the specified experiments via the [ExperimentEngine] and block execution until finished.
+ */
+ public suspend fun run(experiments: Flow<ExperimentDefinition>) {
+ val engine = ExperimentEngine(createStrategy(), createScheduler(), createListener(), repeats)
+ experiments.collect { experiment -> engine.execute(experiment) }
+ }
+
+ /**
+ * Launch the specified experiments via the [ExperimentEngine] and block the current thread until finished.
+ */
+ public fun runBlocking(experiments: Flow<ExperimentDefinition>) {
+ runBlocking {
+ run(experiments)
+ }
+ }
+
+ /**
+ * Return a string representation of this instance.
+ */
+ public override fun toString(): String = "ExperimentEngineLauncher"
+
+ /**
+ * Create the [ExperimentStrategy] that explores the experiment design space.
+ */
+ private fun createStrategy(): ExperimentStrategy {
+ return strategy ?: CartesianExperimentStrategy
+ }
+
+ /**
+ * Create the [ExperimentScheduler] that schedules the trials over the compute resources.
+ */
+ private fun createScheduler(): ExperimentScheduler {
+ return scheduler ?: ThreadPoolExperimentScheduler(Runtime.getRuntime().availableProcessors())
+ }
+
+ /**
+ * Create the [ExperimentExecutionListener] that listens the to the execution of the experiments.
+ */
+ private fun createListener(): ExperimentExecutionListener {
+ require(listeners.isNotEmpty()) { "No listeners registered." }
+ return CompositeExperimentExecutionListener(listeners)
+ }
+}