Move OpenDC modules into simulator root

This change moves the OpenDC modules previously living in the simulator/opendc
directory to the simulator directory itself given that we do not make a
distinction between OpenDC and odcsim anymore.

42 files changed, 0 insertions, 2554 deletions

diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/JobState.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/JobState.kt
deleted file mode 100644
index 1cb2de97..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/JobState.kt
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service
-
-import com.atlarge.opendc.workflows.workload.Job
-
-class JobState(val job: Job, val submittedAt: Long) {
-    /**
-     * A flag to indicate whether this job is finished.
-     */
-    val isFinished: Boolean
-        get() = tasks.isEmpty()
-
-    val tasks: MutableSet<TaskState> = mutableSetOf()
-
-    override fun equals(other: Any?): Boolean = other is JobState && other.job == job
-
-    override fun hashCode(): Int = job.hashCode()
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/StageWorkflowSchedulerListener.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/StageWorkflowSchedulerListener.kt
deleted file mode 100644
index 73c3e752..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/StageWorkflowSchedulerListener.kt
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service
-
-interface StageWorkflowSchedulerListener {
-    fun cycleStarted(scheduler: StageWorkflowService) {}
-    fun cycleFinished(scheduler: StageWorkflowService) {}
-
-    fun jobSubmitted(job: JobState) {}
-    fun jobStarted(job: JobState) {}
-    fun jobFinished(job: JobState) {}
-
-    fun taskReady(task: TaskState) {}
-    fun taskAssigned(task: TaskState) {}
-    fun taskStarted(task: TaskState) {}
-    fun taskFinished(task: TaskState) {}
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/StageWorkflowService.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/StageWorkflowService.kt
deleted file mode 100644
index 3a5b963c..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/StageWorkflowService.kt
+++ /dev/null
@@ -1,360 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service
-
-import com.atlarge.opendc.compute.core.Server
-import com.atlarge.opendc.compute.core.ServerEvent
-import com.atlarge.opendc.compute.core.ServerState
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.compute.metal.service.ProvisioningService
-import com.atlarge.opendc.workflows.service.stage.job.JobAdmissionPolicy
-import com.atlarge.opendc.workflows.service.stage.job.JobOrderPolicy
-import com.atlarge.opendc.workflows.service.stage.resource.ResourceFilterPolicy
-import com.atlarge.opendc.workflows.service.stage.resource.ResourceSelectionPolicy
-import com.atlarge.opendc.workflows.service.stage.task.TaskEligibilityPolicy
-import com.atlarge.opendc.workflows.service.stage.task.TaskOrderPolicy
-import com.atlarge.opendc.workflows.workload.Job
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
-import kotlinx.coroutines.launch
-import org.opendc.utils.flow.EventFlow
-import java.time.Clock
-import java.util.PriorityQueue
-import java.util.Queue
-
-/**
- * A [WorkflowService] that distributes work through a multi-stage process based on the Reference Architecture for
- * Topology Scheduling.
- */
-class StageWorkflowService(
-    internal val coroutineScope: CoroutineScope,
-    internal val clock: Clock,
-    private val provisioningService: ProvisioningService,
-    mode: WorkflowSchedulerMode,
-    jobAdmissionPolicy: JobAdmissionPolicy,
-    jobOrderPolicy: JobOrderPolicy,
-    taskEligibilityPolicy: TaskEligibilityPolicy,
-    taskOrderPolicy: TaskOrderPolicy,
-    resourceFilterPolicy: ResourceFilterPolicy,
-    resourceSelectionPolicy: ResourceSelectionPolicy
-) : WorkflowService {
-
-    /**
-     * The incoming jobs ready to be processed by the scheduler.
-     */
-    internal val incomingJobs: MutableSet<JobState> = linkedSetOf()
-
-    /**
-     * The incoming tasks ready to be processed by the scheduler.
-     */
-    internal val incomingTasks: MutableSet<TaskState> = linkedSetOf()
-
-    /**
-     * The job queue.
-     */
-    internal val jobQueue: Queue<JobState>
-
-    /**
-     * The task queue.
-     */
-    internal val taskQueue: Queue<TaskState>
-
-    /**
-     * The active jobs in the system.
-     */
-    internal val activeJobs: MutableSet<JobState> = mutableSetOf()
-
-    /**
-     * The active tasks in the system.
-     */
-    internal val activeTasks: MutableSet<TaskState> = mutableSetOf()
-
-    /**
-     * The running tasks by [Server].
-     */
-    internal val taskByServer = mutableMapOf<Server, TaskState>()
-
-    /**
-     * The nodes that are controlled by the service.
-     */
-    internal lateinit var nodes: List<Node>
-
-    /**
-     * The available nodes.
-     */
-    internal val available: MutableSet<Node> = mutableSetOf()
-
-    /**
-     * The maximum number of incoming jobs.
-     */
-    private val throttleLimit: Int = 20000
-
-    /**
-     * The load of the system.
-     */
-    internal val load: Double
-        get() = (available.size / nodes.size.toDouble())
-
-    /**
-     * The root listener of this scheduler.
-     */
-    private val rootListener = object : StageWorkflowSchedulerListener {
-        /**
-         * The listeners to delegate to.
-         */
-        val listeners = mutableSetOf<StageWorkflowSchedulerListener>()
-
-        override fun cycleStarted(scheduler: StageWorkflowService) {
-            listeners.forEach { it.cycleStarted(scheduler) }
-        }
-
-        override fun cycleFinished(scheduler: StageWorkflowService) {
-            listeners.forEach { it.cycleFinished(scheduler) }
-        }
-
-        override fun jobSubmitted(job: JobState) {
-            listeners.forEach { it.jobSubmitted(job) }
-        }
-
-        override fun jobStarted(job: JobState) {
-            listeners.forEach { it.jobStarted(job) }
-        }
-
-        override fun jobFinished(job: JobState) {
-            listeners.forEach { it.jobFinished(job) }
-        }
-
-        override fun taskReady(task: TaskState) {
-            listeners.forEach { it.taskReady(task) }
-        }
-
-        override fun taskAssigned(task: TaskState) {
-            listeners.forEach { it.taskAssigned(task) }
-        }
-
-        override fun taskStarted(task: TaskState) {
-            listeners.forEach { it.taskStarted(task) }
-        }
-
-        override fun taskFinished(task: TaskState) {
-            listeners.forEach { it.taskFinished(task) }
-        }
-    }
-
-    private val mode: WorkflowSchedulerMode.Logic
-    private val jobAdmissionPolicy: JobAdmissionPolicy.Logic
-    private val taskEligibilityPolicy: TaskEligibilityPolicy.Logic
-    private val resourceFilterPolicy: ResourceFilterPolicy.Logic
-    private val resourceSelectionPolicy: Comparator<Node>
-    private val eventFlow = EventFlow<WorkflowEvent>()
-
-    init {
-        coroutineScope.launch {
-            nodes = provisioningService.nodes().toList()
-            available.addAll(nodes)
-        }
-
-        this.mode = mode(this)
-        this.jobAdmissionPolicy = jobAdmissionPolicy(this)
-        this.jobQueue = PriorityQueue(100, jobOrderPolicy(this).thenBy { it.job.uid })
-        this.taskEligibilityPolicy = taskEligibilityPolicy(this)
-        this.taskQueue = PriorityQueue(1000, taskOrderPolicy(this).thenBy { it.task.uid })
-        this.resourceFilterPolicy = resourceFilterPolicy(this)
-        this.resourceSelectionPolicy = resourceSelectionPolicy(this)
-    }
-
-    override val events: Flow<WorkflowEvent> = eventFlow
-
-    override suspend fun submit(job: Job) {
-        // J1 Incoming Jobs
-        val jobInstance = JobState(job, clock.millis())
-        val instances = job.tasks.associateWith {
-            TaskState(jobInstance, it)
-        }
-
-        for ((task, instance) in instances) {
-            instance.dependencies.addAll(task.dependencies.map { instances[it]!! })
-            task.dependencies.forEach {
-                instances[it]!!.dependents.add(instance)
-            }
-
-            // If the task has no dependency, it is a root task and can immediately be evaluated
-            if (instance.isRoot) {
-                instance.state = TaskStatus.READY
-            }
-        }
-
-        instances.values.toCollection(jobInstance.tasks)
-        incomingJobs += jobInstance
-        rootListener.jobSubmitted(jobInstance)
-
-        requestCycle()
-    }
-
-    /**
-     * Indicate to the scheduler that a scheduling cycle is needed.
-     */
-    private suspend fun requestCycle() = mode.requestCycle()
-
-    /**
-     * Perform a scheduling cycle immediately.
-     */
-    @OptIn(ExperimentalCoroutinesApi::class)
-    internal suspend fun schedule() {
-        // J2 Create list of eligible jobs
-        val iterator = incomingJobs.iterator()
-        while (iterator.hasNext()) {
-            val jobInstance = iterator.next()
-            val advice = jobAdmissionPolicy(jobInstance)
-            if (advice.stop) {
-                break
-            } else if (!advice.admit) {
-                continue
-            }
-
-            iterator.remove()
-            jobQueue.add(jobInstance)
-            activeJobs += jobInstance
-            eventFlow.emit(WorkflowEvent.JobStarted(this, jobInstance.job, clock.millis()))
-            rootListener.jobStarted(jobInstance)
-        }
-
-        // J4 Per job
-        while (jobQueue.isNotEmpty()) {
-            val jobInstance = jobQueue.poll()
-
-            // Edge-case: job has no tasks
-            if (jobInstance.isFinished) {
-                finishJob(jobInstance)
-            }
-
-            // Add job roots to the scheduling queue
-            for (task in jobInstance.tasks) {
-                if (task.state != TaskStatus.READY) {
-                    continue
-                }
-
-                incomingTasks += task
-                rootListener.taskReady(task)
-            }
-        }
-
-        // T1 Create list of eligible tasks
-        val taskIterator = incomingTasks.iterator()
-        while (taskIterator.hasNext()) {
-            val taskInstance = taskIterator.next()
-            val advice = taskEligibilityPolicy(taskInstance)
-            if (advice.stop) {
-                break
-            } else if (!advice.admit) {
-                continue
-            }
-
-            taskIterator.remove()
-            taskQueue.add(taskInstance)
-        }
-
-        // T3 Per task
-        while (taskQueue.isNotEmpty()) {
-            val instance = taskQueue.peek()
-            val host: Node? = available.firstOrNull()
-
-            if (host != null) {
-                // T4 Submit task to machine
-                available -= host
-                instance.state = TaskStatus.ACTIVE
-                val newHost = provisioningService.deploy(host, instance.task.image)
-                val server = newHost.server!!
-                instance.host = newHost
-                taskByServer[server] = instance
-                server.events
-                    .onEach { event -> if (event is ServerEvent.StateChanged) stateChanged(event.server) }
-                    .launchIn(coroutineScope)
-
-                activeTasks += instance
-                taskQueue.poll()
-                rootListener.taskAssigned(instance)
-            } else {
-                break
-            }
-        }
-    }
-
-    private suspend fun stateChanged(server: Server) {
-        when (server.state) {
-            ServerState.ACTIVE -> {
-                val task = taskByServer.getValue(server)
-                task.startedAt = clock.millis()
-                eventFlow.emit(WorkflowEvent.TaskStarted(this@StageWorkflowService, task.job.job, task.task, clock.millis()))
-                rootListener.taskStarted(task)
-            }
-            ServerState.SHUTOFF, ServerState.ERROR -> {
-                val task = taskByServer.remove(server) ?: throw IllegalStateException()
-                val job = task.job
-                task.state = TaskStatus.FINISHED
-                task.finishedAt = clock.millis()
-                job.tasks.remove(task)
-                available += task.host!!
-                activeTasks -= task
-                eventFlow.emit(WorkflowEvent.TaskFinished(this@StageWorkflowService, task.job.job, task.task, clock.millis()))
-                rootListener.taskFinished(task)
-
-                // Add job roots to the scheduling queue
-                for (dependent in task.dependents) {
-                    if (dependent.state != TaskStatus.READY) {
-                        continue
-                    }
-
-                    incomingTasks += dependent
-                    rootListener.taskReady(dependent)
-                }
-
-                if (job.isFinished) {
-                    finishJob(job)
-                }
-
-                requestCycle()
-            }
-            else -> throw IllegalStateException()
-        }
-    }
-
-    private suspend fun finishJob(job: JobState) {
-        activeJobs -= job
-        eventFlow.emit(WorkflowEvent.JobFinished(this, job.job, clock.millis()))
-        rootListener.jobFinished(job)
-    }
-
-    fun addListener(listener: StageWorkflowSchedulerListener) {
-        rootListener.listeners += listener
-    }
-
-    fun removeListener(listener: StageWorkflowSchedulerListener) {
-        rootListener.listeners -= listener
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/TaskState.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/TaskState.kt
deleted file mode 100644
index acd5731b..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/TaskState.kt
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service
-
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.workflows.workload.Task
-
-class TaskState(val job: JobState, val task: Task) {
-    /**
-     * The moment in time the task was started.
-     */
-    var startedAt: Long = Long.MIN_VALUE
-
-    /**
-     * The moment in time the task was finished.
-     */
-    var finishedAt: Long = Long.MIN_VALUE
-
-    /**
-     * The dependencies of this task.
-     */
-    val dependencies = HashSet<TaskState>()
-
-    /**
-     * The dependents of this task.
-     */
-    val dependents = HashSet<TaskState>()
-
-    /**
-     * A flag to indicate whether this workflow task instance is a workflow root.
-     */
-    val isRoot: Boolean
-        get() = dependencies.isEmpty()
-
-    var state: TaskStatus = TaskStatus.CREATED
-        set(value) {
-            field = value
-
-            // Mark the process as terminated in the graph
-            if (value == TaskStatus.FINISHED) {
-                markTerminated()
-            }
-        }
-
-    var host: Node? = null
-
-    /**
-     * Mark the specified [TaskView] as terminated.
-     */
-    private fun markTerminated() {
-        for (dependent in dependents) {
-            dependent.dependencies.remove(this)
-
-            if (dependent.isRoot) {
-                dependent.state = TaskStatus.READY
-            }
-        }
-    }
-
-    override fun equals(other: Any?): Boolean = other is TaskState && other.job == job && other.task == task
-
-    override fun hashCode(): Int = task.hashCode()
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/TaskStatus.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/TaskStatus.kt
deleted file mode 100644
index c53c6171..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/TaskStatus.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service
-
-/**
- * The state of a workflow task.
- */
-public enum class TaskStatus {
-    CREATED,
-    READY,
-    ACTIVE,
-    FINISHED
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowEvent.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowEvent.kt
deleted file mode 100644
index 2ca5a19d..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowEvent.kt
+++ /dev/null
@@ -1,76 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service
-
-import com.atlarge.opendc.workflows.workload.Job
-import com.atlarge.opendc.workflows.workload.Task
-
-/**
- * An event emitted by the [WorkflowService].
- */
-public sealed class WorkflowEvent {
-    /**
-     * The [WorkflowService] that emitted the event.
-     */
-    public abstract val service: WorkflowService
-
-    /**
-     * This event is emitted when a job has become active.
-     */
-    public data class JobStarted(
-        override val service: WorkflowService,
-        public val job: Job,
-        public val time: Long
-    ) : WorkflowEvent()
-
-    /**
-     * This event is emitted when a job has finished processing.
-     */
-    public data class JobFinished(
-        override val service: WorkflowService,
-        public val job: Job,
-        public val time: Long
-    ) : WorkflowEvent()
-
-    /**
-     * This event is emitted when a task of a job has started processing.
-     */
-    public data class TaskStarted(
-        override val service: WorkflowService,
-        public val job: Job,
-        public val task: Task,
-        public val time: Long
-    ) : WorkflowEvent()
-
-    /**
-     * This event is emitted when a task of a job has started processing.
-     */
-    public data class TaskFinished(
-        override val service: WorkflowService,
-        public val job: Job,
-        public val task: Task,
-        public val time: Long
-    ) : WorkflowEvent()
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowSchedulerMode.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowSchedulerMode.kt
deleted file mode 100644
index cb075b18..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowSchedulerMode.kt
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service
-
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.yield
-
-/**
- * The operating mode of a workflow scheduler.
- */
-sealed class WorkflowSchedulerMode : StagePolicy<WorkflowSchedulerMode.Logic> {
-    /**
-     * The logic for operating the cycles of a workflow scheduler.
-     */
-    interface Logic {
-        /**
-         * Request a new scheduling cycle to be performed.
-         */
-        suspend fun requestCycle()
-    }
-
-    /**
-     * An interactive scheduler immediately triggers a new scheduling cycle when a workflow is received.
-     */
-    object Interactive : WorkflowSchedulerMode() {
-        override fun invoke(scheduler: StageWorkflowService): Logic = object : Logic {
-            override suspend fun requestCycle() {
-                yield()
-                scheduler.schedule()
-            }
-        }
-
-        override fun toString(): String = "Interactive"
-    }
-
-    /**
-     * A batch scheduler triggers a scheduling cycle every time quantum if needed.
-     */
-    data class Batch(val quantum: Long) : WorkflowSchedulerMode() {
-        private var next: kotlinx.coroutines.Job? = null
-
-        override fun invoke(scheduler: StageWorkflowService): Logic = object : Logic {
-            override suspend fun requestCycle() {
-                if (next == null) {
-                    // In batch mode, we assume that the scheduler runs at a fixed slot every time
-                    // quantum (e.g t=0, t=60, t=120). We calculate here the delay until the next scheduling slot.
-                    val delay = quantum - (scheduler.clock.millis() % quantum)
-
-                    val job = scheduler.coroutineScope.launch {
-                        delay(delay)
-                        next = null
-                        scheduler.schedule()
-                    }
-                    next = job
-                }
-            }
-        }
-
-        override fun toString(): String = "Batch($quantum)"
-    }
-
-    /**
-     * A scheduling cycle is triggered at a random point in time.
-     */
-    data class Random(private val random: java.util.Random = java.util.Random(123)) : WorkflowSchedulerMode() {
-        private var next: kotlinx.coroutines.Job? = null
-
-        override fun invoke(scheduler: StageWorkflowService): Logic = object : Logic {
-            override suspend fun requestCycle() {
-                if (next == null) {
-                    val delay = random.nextInt(200).toLong()
-
-                    val job = scheduler.coroutineScope.launch {
-                        delay(delay)
-                        next = null
-                        scheduler.schedule()
-                    }
-                    next = job
-                }
-            }
-        }
-
-        override fun toString(): String = "Random"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowService.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowService.kt
deleted file mode 100644
index ad818dde..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/WorkflowService.kt
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service
-
-import com.atlarge.opendc.core.services.AbstractServiceKey
-import com.atlarge.opendc.workflows.workload.Job
-import kotlinx.coroutines.flow.Flow
-import java.util.UUID
-
-/**
- * A service for cloud workflow management.
- *
- * The workflow scheduler is modelled after the Reference Architecture for Topology Scheduling by Andreadis et al.
- */
-public interface WorkflowService {
-    /**
-     * Thie events emitted by the workflow scheduler.
-     */
-    public val events: Flow<WorkflowEvent>
-
-    /**
-     * Submit the specified [Job] to the workflow service for scheduling.
-     */
-    public suspend fun submit(job: Job)
-
-    /**
-     * The service key for the workflow scheduler.
-     */
-    companion object Key : AbstractServiceKey<WorkflowService>(UUID.randomUUID(), "workflows")
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/StagePolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/StagePolicy.kt
deleted file mode 100644
index c7cc3d84..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/StagePolicy.kt
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import java.io.Serializable
-
-/**
- * A scheduling stage policy.
- */
-interface StagePolicy<T : Any> : Serializable {
-    /**
-     * Build the logic of the stage policy.
-     */
-    operator fun invoke(scheduler: StageWorkflowService): T
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/DurationJobOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/DurationJobOrderPolicy.kt
deleted file mode 100644
index bbdb9f71..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/DurationJobOrderPolicy.kt
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.workload.Job
-import com.atlarge.opendc.workflows.workload.Task
-import com.atlarge.opendc.workflows.workload.WORKFLOW_TASK_DEADLINE
-
-/**
- * A [JobOrderPolicy] that orders jobs based on its critical path length.
- */
-data class DurationJobOrderPolicy(val ascending: Boolean = true) : JobOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService): Comparator<JobState> =
-        object : Comparator<JobState>, StageWorkflowSchedulerListener {
-            private val results = HashMap<Job, Long>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            private val Job.duration: Long
-                get() = results[this]!!
-
-            override fun jobSubmitted(job: JobState) {
-                results[job.job] = job.job.toposort().map { task ->
-                    val estimable = task.metadata[WORKFLOW_TASK_DEADLINE] as? Long?
-                    estimable ?: Long.MAX_VALUE
-                }.sum()
-            }
-
-            override fun jobFinished(job: JobState) {
-                results.remove(job.job)
-            }
-
-            override fun compare(o1: JobState, o2: JobState): Int {
-                return compareValuesBy(o1, o2) { it.job.duration }.let { if (ascending) it else -it }
-            }
-        }
-
-    override fun toString(): String {
-        return "Job-Duration(${if (ascending) "asc" else "desc"})"
-    }
-}
-
-/**
- * Create a topological sorting of the tasks in a job.
- *
- * @return The list of tasks within the job topologically sorted.
- */
-fun Job.toposort(): List<Task> {
-    val res = mutableListOf<Task>()
-    val visited = mutableSetOf<Task>()
-    val adjacent = mutableMapOf<Task, MutableList<Task>>()
-
-    for (task in tasks) {
-        for (dependency in task.dependencies) {
-            adjacent.getOrPut(dependency) { mutableListOf() }.add(task)
-        }
-    }
-
-    fun visit(task: Task) {
-        visited.add(task)
-
-        adjacent[task] ?: emptyList<Task>()
-            .asSequence()
-            .filter { it !in visited }
-            .forEach { visit(it) }
-
-        res.add(task)
-    }
-
-    tasks
-        .asSequence()
-        .filter { it !in visited }
-        .forEach { visit(it) }
-    return res
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/JobAdmissionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/JobAdmissionPolicy.kt
deleted file mode 100644
index 535d7792..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/JobAdmissionPolicy.kt
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-
-/**
- * A policy interface for admitting [JobState]s to a scheduling cycle.
- */
-interface JobAdmissionPolicy : StagePolicy<JobAdmissionPolicy.Logic> {
-    interface Logic {
-        /**
-         * Determine whether the specified [JobState] should be admitted to the scheduling cycle.
-         *
-         * @param job The workflow that has been submitted.
-         * @return The advice for admitting the job.
-         */
-        operator fun invoke(job: JobState): Advice
-    }
-
-    /**
-     * The advice given to the scheduler by an admission policy.
-     *
-     * @property admit A flag to indicate to the scheduler that the job should be admitted.
-     * @property stop A flag to indicate the scheduler should immediately stop admitting jobs to the scheduling queue and wait
-     * for the next scheduling cycle.
-     */
-    enum class Advice(val admit: Boolean, val stop: Boolean) {
-        /**
-         * Admit the current job to the scheduling queue and continue admitting jobs.
-         */
-        ADMIT(true, false),
-
-        /**
-         * Admit the current job to the scheduling queue and stop admitting jobs.
-         */
-        ADMIT_LAST(true, true),
-
-        /**
-         * Deny the current job, but continue admitting jobs.
-         */
-        DENY(false, false),
-
-        /**
-         * Deny the current job and also stop admitting jobs.
-         */
-        STOP(false, true)
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/JobOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/JobOrderPolicy.kt
deleted file mode 100644
index ba57f064..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/JobOrderPolicy.kt
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-
-/**
- * A policy interface for ordering admitted workflows in the scheduling queue.
- */
-interface JobOrderPolicy : StagePolicy<Comparator<JobState>>
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/LimitJobAdmissionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/LimitJobAdmissionPolicy.kt
deleted file mode 100644
index 6b1faf20..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/LimitJobAdmissionPolicy.kt
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-
-/**
- * A [JobAdmissionPolicy] that limits the amount of active jobs in the system.
- *
- * @property limit The maximum number of concurrent jobs in the system.
- */
-data class LimitJobAdmissionPolicy(val limit: Int) : JobAdmissionPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : JobAdmissionPolicy.Logic {
-        override fun invoke(
-            job: JobState
-        ): JobAdmissionPolicy.Advice =
-            if (scheduler.activeJobs.size < limit)
-                JobAdmissionPolicy.Advice.ADMIT
-            else
-                JobAdmissionPolicy.Advice.STOP
-    }
-
-    override fun toString(): String = "Limit-Active($limit)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/LoadJobAdmissionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/LoadJobAdmissionPolicy.kt
deleted file mode 100644
index e1c27472..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/LoadJobAdmissionPolicy.kt
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-
-/**
- * A [JobAdmissionPolicy] that limits the amount of jobs based on the average system load.
- *
- * @property limit The maximum load before stopping admission.
- */
-data class LoadJobAdmissionPolicy(val limit: Double) : JobAdmissionPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : JobAdmissionPolicy.Logic {
-        override fun invoke(
-            job: JobState
-        ): JobAdmissionPolicy.Advice =
-            if (scheduler.load < limit)
-                JobAdmissionPolicy.Advice.ADMIT
-            else
-                JobAdmissionPolicy.Advice.STOP
-    }
-
-    override fun toString(): String = "Limit-Load($limit)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/NullJobAdmissionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/NullJobAdmissionPolicy.kt
deleted file mode 100644
index 46888467..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/NullJobAdmissionPolicy.kt
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-
-/**
- * A [JobAdmissionPolicy] that admits all jobs.
- */
-object NullJobAdmissionPolicy : JobAdmissionPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : JobAdmissionPolicy.Logic {
-        override fun invoke(job: JobState): JobAdmissionPolicy.Advice = JobAdmissionPolicy.Advice.ADMIT
-    }
-
-    override fun toString(): String = "Always"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/RandomJobOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/RandomJobOrderPolicy.kt
deleted file mode 100644
index 14a3d98d..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/RandomJobOrderPolicy.kt
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.workload.Job
-import java.util.Random
-
-/**
- * A [JobOrderPolicy] that randomly orders jobs.
- */
-object RandomJobOrderPolicy : JobOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService): Comparator<JobState> =
-        object : Comparator<JobState>, StageWorkflowSchedulerListener {
-            private val random = Random(123)
-            private val ids = HashMap<Job, Int>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun jobSubmitted(job: JobState) {
-                ids[job.job] = random.nextInt()
-            }
-
-            override fun jobFinished(job: JobState) {
-                ids.remove(job.job)
-            }
-
-            override fun compare(o1: JobState, o2: JobState): Int {
-                return compareValuesBy(o1, o2) { ids.getValue(it.job) }
-            }
-        }
-
-    override fun toString(): String {
-        return "Random"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/SizeJobOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/SizeJobOrderPolicy.kt
deleted file mode 100644
index 3bce43cf..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/SizeJobOrderPolicy.kt
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-
-/**
- * A [SizeJobOrderPolicy] that orders jobs based on the number of tasks it has.
- */
-data class SizeJobOrderPolicy(val ascending: Boolean = true) : JobOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService) =
-        compareBy<JobState> { it.tasks.size.let { if (ascending) it else -it } }
-
-    override fun toString(): String {
-        return "Job-Size(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/SubmissionTimeJobOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/SubmissionTimeJobOrderPolicy.kt
deleted file mode 100644
index d6e24b2b..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/job/SubmissionTimeJobOrderPolicy.kt
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.job
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-
-/**
- * A [JobOrderPolicy] orders jobs in FIFO order.
- */
-data class SubmissionTimeJobOrderPolicy(val ascending: Boolean = true) : JobOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService) =
-        compareBy<JobState> { it.submittedAt.let { if (ascending) it else -it } }
-
-    override fun toString(): String {
-        return "Submission-Time(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/FirstFitResourceSelectionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/FirstFitResourceSelectionPolicy.kt
deleted file mode 100644
index a5671d45..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/FirstFitResourceSelectionPolicy.kt
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.resource
-
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-
-/**
- * A [ResourceSelectionPolicy] that selects the first machine that is available.
- */
-object FirstFitResourceSelectionPolicy : ResourceSelectionPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : Comparator<Node> {
-        override fun compare(o1: Node, o2: Node): Int = 1
-    }
-
-    override fun toString(): String = "First-Fit"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/FunctionalResourceFilterPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/FunctionalResourceFilterPolicy.kt
deleted file mode 100644
index 0e83d8d7..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/FunctionalResourceFilterPolicy.kt
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.resource
-
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [ResourceFilterPolicy] based on the amount of cores available on the machine and the cores required for
- * the task.
- */
-object FunctionalResourceFilterPolicy : ResourceFilterPolicy {
-    override fun invoke(scheduler: StageWorkflowService): ResourceFilterPolicy.Logic =
-        object : ResourceFilterPolicy.Logic {
-            override fun invoke(hosts: Sequence<Node>, task: TaskState): Sequence<Node> =
-                hosts.filter { it in scheduler.available }
-        }
-
-    override fun toString(): String = "functional"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/RandomResourceSelectionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/RandomResourceSelectionPolicy.kt
deleted file mode 100644
index 9b05cbac..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/RandomResourceSelectionPolicy.kt
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.resource
-
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import java.util.Random
-
-/**
- * A [ResourceSelectionPolicy] that randomly orders the machines.
- */
-object RandomResourceSelectionPolicy : ResourceSelectionPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : Comparator<Node> {
-        private val ids: Map<Node, Long>
-
-        init {
-            val random = Random(123)
-            ids = scheduler.nodes.associateWith { random.nextLong() }
-        }
-
-        override fun compare(o1: Node, o2: Node): Int = compareValuesBy(o1, o2) { ids[it] }
-    }
-
-    override fun toString(): String = "Random"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/ResourceFilterPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/ResourceFilterPolicy.kt
deleted file mode 100644
index 28ef970f..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/ResourceFilterPolicy.kt
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.resource
-
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.workflows.service.TaskState
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-
-/**
- * This interface represents stages **R2**, **R3** and **R4** stage of the Reference Architecture for Schedulers and
- * acts as a filter yielding a list of resources with sufficient resource-capacities, based on fixed or dynamic
- * requirements, and on predicted or monitored information about processing unit availability, memory occupancy, etc.
- */
-interface ResourceFilterPolicy : StagePolicy<ResourceFilterPolicy.Logic> {
-    interface Logic {
-        /**
-         * Filter the list of machines based on dynamic information.
-         *
-         * @param hosts The hosts to filter.
-         * @param task The task that is to be scheduled.
-         * @return The machines on which the task can be scheduled.
-         */
-        operator fun invoke(hosts: Sequence<Node>, task: TaskState): Sequence<Node>
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/ResourceSelectionPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/ResourceSelectionPolicy.kt
deleted file mode 100644
index 43053097..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/resource/ResourceSelectionPolicy.kt
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.resource
-
-import com.atlarge.opendc.compute.metal.Node
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-
-/**
- * This interface represents the **R5** stage of the Reference Architecture for Schedulers and matches the the selected
- * task with a (set of) resource(s), using policies such as First-Fit, Worst-Fit, and Best-Fit.
- */
-interface ResourceSelectionPolicy : StagePolicy<Comparator<Node>>
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/ActiveTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/ActiveTaskOrderPolicy.kt
deleted file mode 100644
index b084d26c..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/ActiveTaskOrderPolicy.kt
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskOrderPolicy] that orders tasks based on the number of active relative tasks (w.r.t. its job) in the system.
- */
-data class ActiveTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService): Comparator<TaskState> =
-        object : Comparator<TaskState>, StageWorkflowSchedulerListener {
-            private val active = mutableMapOf<JobState, Int>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun jobStarted(job: JobState) {
-                active[job] = 0
-            }
-
-            override fun jobFinished(job: JobState) {
-                active.remove(job)
-            }
-
-            override fun taskAssigned(task: TaskState) {
-                active.merge(task.job, 1, Int::plus)
-            }
-
-            override fun taskFinished(task: TaskState) {
-                active.merge(task.job, -1, Int::plus)
-            }
-
-            override fun compare(o1: TaskState, o2: TaskState): Int {
-                return compareValuesBy(o1, o2) { active.getValue(it.job) }.let {
-                    if (ascending) it else -it
-                }
-            }
-        }
-
-    override fun toString(): String {
-        return "Active-Per-Job(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/BalancingTaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/BalancingTaskEligibilityPolicy.kt
deleted file mode 100644
index 2255d40c..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/BalancingTaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-import kotlin.math.max
-
-/**
- * A [TaskEligibilityPolicy] that balances the tasks based on their job, e.g. do not allow a single job to claim all
- * resources of the system.
- *
- * @property tolerance The maximum difference from the average number of tasks per job in the system as a fraction of
- * the average.
- */
-data class BalancingTaskEligibilityPolicy(val tolerance: Double = 1.5) : TaskEligibilityPolicy {
-    override fun invoke(scheduler: StageWorkflowService): TaskEligibilityPolicy.Logic =
-        object : TaskEligibilityPolicy.Logic, StageWorkflowSchedulerListener {
-            private val active = mutableMapOf<JobState, Int>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun jobStarted(job: JobState) {
-                active[job] = 0
-            }
-
-            override fun jobFinished(job: JobState) {
-                active.remove(job)
-            }
-
-            override fun taskAssigned(task: TaskState) {
-                active.merge(task.job, 1, Int::plus)
-            }
-
-            override fun taskFinished(task: TaskState) {
-                active.merge(task.job, -1, Int::plus)
-            }
-
-            override fun invoke(task: TaskState): TaskEligibilityPolicy.Advice {
-                val activeJobs = scheduler.activeJobs.size
-                val activeTasks = scheduler.activeTasks.size
-                val baseline = max(activeTasks / activeJobs.toDouble(), 1.0)
-                val activeForJob = active[task.job]!!
-                return if ((activeForJob + 1) / baseline < tolerance)
-                    TaskEligibilityPolicy.Advice.ADMIT
-                else
-                    TaskEligibilityPolicy.Advice.DENY
-            }
-        }
-
-    override fun toString(): String = "Job-Balance($tolerance)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/CompletionTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/CompletionTaskOrderPolicy.kt
deleted file mode 100644
index d0cf1374..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/CompletionTaskOrderPolicy.kt
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskOrderPolicy] that orders tasks based on the number of completed relative tasks.
- */
-data class CompletionTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService): Comparator<TaskState> =
-        object : Comparator<TaskState>, StageWorkflowSchedulerListener {
-            private val finished = mutableMapOf<JobState, Int>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun jobStarted(job: JobState) {
-                finished[job] = 0
-            }
-
-            override fun jobFinished(job: JobState) {
-                finished.remove(job)
-            }
-
-            override fun taskFinished(task: TaskState) {
-                finished.merge(task.job, 1, Int::plus)
-            }
-
-            override fun compare(o1: TaskState, o2: TaskState): Int {
-                return compareValuesBy(o1, o2) { finished.getValue(it.job) / it.job.tasks.size.toDouble() }.let {
-                    if (ascending) it else -it
-                }
-            }
-        }
-
-    override fun toString(): String {
-        return "Job-Completion(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DependenciesTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DependenciesTaskOrderPolicy.kt
deleted file mode 100644
index 73d83d21..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DependenciesTaskOrderPolicy.kt
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskOrderPolicy] that orders tasks based on the number of dependency tasks it has.
- */
-data class DependenciesTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = compareBy<TaskState> {
-        it.task.dependencies.size.let { if (ascending) it else -it }
-    }
-
-    override fun toString(): String {
-        return "Task-Dependencies(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DependentsTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DependentsTaskOrderPolicy.kt
deleted file mode 100644
index 85b3543f..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DependentsTaskOrderPolicy.kt
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskOrderPolicy] that orders tasks based on the number of dependent tasks it has.
- */
-data class DependentsTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = compareBy<TaskState> {
-        it.dependents.size.let { if (ascending) it else -it }
-    }
-
-    override fun toString(): String {
-        return "Task-Dependents(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DurationHistoryTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DurationHistoryTaskOrderPolicy.kt
deleted file mode 100644
index 426a76a4..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DurationHistoryTaskOrderPolicy.kt
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskOrderPolicy] that orders tasks based on the average duration of the preceding tasks in the job.
- */
-data class DurationHistoryTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-
-    override fun invoke(scheduler: StageWorkflowService): Comparator<TaskState> =
-        object : Comparator<TaskState>, StageWorkflowSchedulerListener {
-            private val results = HashMap<JobState, MutableList<Long>>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun jobStarted(job: JobState) {
-                results[job] = mutableListOf()
-            }
-
-            override fun jobFinished(job: JobState) {
-                results.remove(job)
-            }
-
-            override fun taskFinished(task: TaskState) {
-                results.getValue(task.job) += task.finishedAt - task.startedAt
-            }
-
-            override fun compare(o1: TaskState, o2: TaskState): Int {
-                return compareValuesBy(o1, o2) { key ->
-                    val history = results.getValue(key.job)
-                    if (history.isEmpty()) {
-                        Long.MAX_VALUE
-                    } else {
-                        history.average()
-                    }
-                }.let { if (ascending) it else -it }
-            }
-        }
-
-    override fun toString(): String {
-        return "Task-Duration-History(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DurationTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DurationTaskOrderPolicy.kt
deleted file mode 100644
index 23b47891..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/DurationTaskOrderPolicy.kt
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-import com.atlarge.opendc.workflows.workload.WORKFLOW_TASK_DEADLINE
-import java.util.UUID
-
-/**
- * A [TaskOrderPolicy] orders tasks based on the pre-specified (approximate) duration of the task.
- */
-data class DurationTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-
-    override fun invoke(scheduler: StageWorkflowService): Comparator<TaskState> =
-        object : Comparator<TaskState>, StageWorkflowSchedulerListener {
-            private val results = HashMap<UUID, Long>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun taskReady(task: TaskState) {
-                val deadline = task.task.metadata[WORKFLOW_TASK_DEADLINE] as? Long?
-                results[task.task.uid] = deadline ?: Long.MAX_VALUE
-            }
-
-            override fun taskFinished(task: TaskState) {
-                results -= task.task.uid
-            }
-
-            private val TaskState.duration: Long
-                get() = results.getValue(task.uid)
-
-            override fun compare(o1: TaskState, o2: TaskState): Int {
-                return compareValuesBy(o1, o2) { state -> state.duration }.let {
-                    if (ascending) it else -it
-                }
-            }
-        }
-
-    override fun toString(): String {
-        return "Task-Duration(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LimitPerJobTaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LimitPerJobTaskEligibilityPolicy.kt
deleted file mode 100644
index c039bf6f..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LimitPerJobTaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.JobState
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskEligibilityPolicy] that limits the number of active tasks of a job in the system.
- */
-data class LimitPerJobTaskEligibilityPolicy(val limit: Int) : TaskEligibilityPolicy {
-    override fun invoke(scheduler: StageWorkflowService): TaskEligibilityPolicy.Logic =
-        object : TaskEligibilityPolicy.Logic, StageWorkflowSchedulerListener {
-            private val active = mutableMapOf<JobState, Int>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun jobStarted(job: JobState) {
-                active[job] = 0
-            }
-
-            override fun jobFinished(job: JobState) {
-                active.remove(job)
-            }
-
-            override fun taskAssigned(task: TaskState) {
-                active.merge(task.job, 1, Int::plus)
-            }
-
-            override fun taskFinished(task: TaskState) {
-                active.merge(task.job, -1, Int::plus)
-            }
-
-            override fun invoke(task: TaskState): TaskEligibilityPolicy.Advice {
-                val activeForJob = active[task.job]!!
-                return if (activeForJob <= limit)
-                    TaskEligibilityPolicy.Advice.ADMIT
-                else
-                    TaskEligibilityPolicy.Advice.DENY
-            }
-        }
-
-    override fun toString(): String = "Limit-Active-Job($limit)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LimitTaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LimitTaskEligibilityPolicy.kt
deleted file mode 100644
index 75322ef5..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LimitTaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskEligibilityPolicy] that limits the total number of active tasks in the system.
- */
-data class LimitTaskEligibilityPolicy(val limit: Int) : TaskEligibilityPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : TaskEligibilityPolicy.Logic {
-        override fun invoke(
-            task: TaskState
-        ): TaskEligibilityPolicy.Advice =
-            if (scheduler.activeTasks.size < limit)
-                TaskEligibilityPolicy.Advice.ADMIT
-            else
-                TaskEligibilityPolicy.Advice.STOP
-    }
-
-    override fun toString(): String = "Limit-Active($limit)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LoadTaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LoadTaskEligibilityPolicy.kt
deleted file mode 100644
index 090f7be7..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/LoadTaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskEligibilityPolicy] that limits the number of active tasks in the system based on the average system load.
- */
-data class LoadTaskEligibilityPolicy(val limit: Double) : TaskEligibilityPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : TaskEligibilityPolicy.Logic {
-        override fun invoke(
-            task: TaskState
-        ): TaskEligibilityPolicy.Advice =
-            if (scheduler.load < limit)
-                TaskEligibilityPolicy.Advice.ADMIT
-            else
-                TaskEligibilityPolicy.Advice.STOP
-    }
-
-    override fun toString(): String = "Limit-Load($limit)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/NullTaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/NullTaskEligibilityPolicy.kt
deleted file mode 100644
index 889f2ab5..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/NullTaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskEligibilityPolicy] that always allows new tasks to enter.
- */
-object NullTaskEligibilityPolicy : TaskEligibilityPolicy {
-    override fun invoke(scheduler: StageWorkflowService): TaskEligibilityPolicy.Logic = Logic
-
-    private object Logic : TaskEligibilityPolicy.Logic {
-        override fun invoke(
-            task: TaskState
-        ): TaskEligibilityPolicy.Advice = TaskEligibilityPolicy.Advice.ADMIT
-    }
-
-    override fun toString(): String = "Always"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/RandomTaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/RandomTaskEligibilityPolicy.kt
deleted file mode 100644
index d6f49d14..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/RandomTaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-import java.util.Random
-
-/**
- * A [TaskEligibilityPolicy] that randomly accepts tasks in the system with some [probability].
- */
-data class RandomTaskEligibilityPolicy(val probability: Double = 0.5) : TaskEligibilityPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = object : TaskEligibilityPolicy.Logic {
-        val random = Random(123)
-
-        override fun invoke(task: TaskState): TaskEligibilityPolicy.Advice =
-            if (random.nextDouble() <= probability || scheduler.activeTasks.isEmpty())
-                TaskEligibilityPolicy.Advice.ADMIT
-            else {
-                TaskEligibilityPolicy.Advice.DENY
-            }
-    }
-
-    override fun toString(): String = "Random($probability)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/RandomTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/RandomTaskOrderPolicy.kt
deleted file mode 100644
index 4c309085..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/RandomTaskOrderPolicy.kt
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowSchedulerListener
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-import com.atlarge.opendc.workflows.workload.Task
-import kotlin.random.Random
-
-/**
- * A [TaskOrderPolicy] that orders the tasks randomly.
- */
-object RandomTaskOrderPolicy : TaskOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService): Comparator<TaskState> =
-        object : Comparator<TaskState>, StageWorkflowSchedulerListener {
-            private val random = Random(123)
-            private val ids = HashMap<Task, Int>()
-
-            init {
-                scheduler.addListener(this)
-            }
-
-            override fun taskReady(task: TaskState) {
-                ids[task.task] = random.nextInt()
-            }
-
-            override fun taskFinished(task: TaskState) {
-                ids.remove(task.task)
-            }
-
-            override fun compare(o1: TaskState, o2: TaskState): Int {
-                return compareValuesBy(o1, o2) { ids.getValue(it.task) }
-            }
-        }
-
-    override fun toString(): String {
-        return "Random"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/SubmissionTimeTaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/SubmissionTimeTaskOrderPolicy.kt
deleted file mode 100644
index a261965f..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/SubmissionTimeTaskOrderPolicy.kt
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.StageWorkflowService
-import com.atlarge.opendc.workflows.service.TaskState
-
-/**
- * A [TaskOrderPolicy] that orders tasks based on the order of arrival in the queue.
- */
-data class SubmissionTimeTaskOrderPolicy(val ascending: Boolean = true) : TaskOrderPolicy {
-    override fun invoke(scheduler: StageWorkflowService) = compareBy<TaskState> {
-        it.job.submittedAt.let { if (ascending) it else -it }
-    }
-
-    override fun toString(): String {
-        return "Submission-Time(${if (ascending) "asc" else "desc"})"
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/TaskEligibilityPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/TaskEligibilityPolicy.kt
deleted file mode 100644
index 72a7fdd0..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/TaskEligibilityPolicy.kt
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.TaskState
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-
-/**
- * A policy interface for determining the eligibility of tasks in a scheduling cycle.
- */
-interface TaskEligibilityPolicy : StagePolicy<TaskEligibilityPolicy.Logic> {
-    interface Logic {
-        /**
-         * Determine whether the specified [TaskState] is eligible to be scheduled.
-         *
-         * @param task The task instance to schedule.
-         * @return The advice for marking the task.
-         */
-        operator fun invoke(task: TaskState): Advice
-    }
-
-    /**
-     * The advice given to the scheduler by an admission policy.
-     *
-     * @property admit A flag to indicate to the scheduler that the job should be admitted.
-     * @property stop A flag to indicate the scheduler should immediately stop admitting jobs to the scheduling queue and wait
-     * for the next scheduling cycle.
-     */
-    enum class Advice(val admit: Boolean, val stop: Boolean) {
-        /**
-         * Admit the current job to the scheduling queue and continue admitting jobs.
-         */
-        ADMIT(true, false),
-
-        /**
-         * Admit the current job to the scheduling queue and stop admitting jobs.
-         */
-        ADMIT_LAST(true, true),
-
-        /**
-         * Deny the current job, but continue admitting jobs.
-         */
-        DENY(false, false),
-
-        /**
-         * Deny the current job and also stop admitting jobs.
-         */
-        STOP(false, true)
-    }
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/TaskOrderPolicy.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/TaskOrderPolicy.kt
deleted file mode 100644
index e74082c2..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/service/stage/task/TaskOrderPolicy.kt
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.service.stage.task
-
-import com.atlarge.opendc.workflows.service.TaskState
-import com.atlarge.opendc.workflows.service.stage.StagePolicy
-
-/**
- * This interface represents the **T2** stage of the Reference Architecture for Topology Schedulers and provides the
- * scheduler with a sorted list of tasks to schedule.
- */
-interface TaskOrderPolicy : StagePolicy<Comparator<TaskState>>
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Job.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Job.kt
deleted file mode 100644
index 02969d8a..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Job.kt
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.workload
-
-import com.atlarge.opendc.core.User
-import com.atlarge.opendc.core.workload.Workload
-import java.util.UUID
-
-/**
- * A workload that represents a directed acyclic graph (DAG) of tasks with control and data dependencies between tasks.
- *
- * @property uid A unique identified of this workflow.
- * @property name The name of this workflow.
- * @property owner The owner of the workflow.
- * @property tasks The tasks that are part of this workflow.
- * @property metadata Additional metadata for the job.
- */
-data class Job(
-    override val uid: UUID,
-    override val name: String,
-    override val owner: User,
-    val tasks: Set<Task>,
-    val metadata: Map<String, Any> = emptyMap()
-) : Workload {
-    override fun equals(other: Any?): Boolean = other is Job && uid == other.uid
-
-    override fun hashCode(): Int = uid.hashCode()
-
-    override fun toString(): String = "Job(uid=$uid, name=$name, tasks=${tasks.size}, metadata=$metadata)"
-}
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Metadata.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Metadata.kt
deleted file mode 100644
index 067f1179..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Metadata.kt
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2020 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 com.atlarge.opendc.workflows.workload
-
-/**
- * Meta-data key for the deadline of a task.
- */
-const val WORKFLOW_TASK_DEADLINE = "workflow:task:deadline"
diff --git a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Task.kt b/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Task.kt
deleted file mode 100644
index 82521faa..00000000
--- a/simulator/opendc/opendc-workflows/src/main/kotlin/com/atlarge/opendc/workflows/workload/Task.kt
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 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 com.atlarge.opendc.workflows.workload
-
-import com.atlarge.opendc.compute.core.image.Image
-import com.atlarge.opendc.core.Identity
-import java.util.UUID
-
-/**
- * A stage of a [Job].
- *
- * @property uid A unique identified of this task.
- * @property name The name of this task.
- * @property image The application image to run as part of this workflow task.
- * @property dependencies The dependencies of this task in order for it to execute.
- * @property metadata Additional metadata for this task.
- */
-data class Task(
-    override val uid: UUID,
-    override val name: String,
-    val image: Image,
-    val dependencies: Set<Task>,
-    val metadata: Map<String, Any> = emptyMap()
-) : Identity {
-    override fun equals(other: Any?): Boolean = other is Task && uid == other.uid
-
-    override fun hashCode(): Int = uid.hashCode()
-}