refactor(trace): Implement trace API for WTF reader

This change updates the WTF trace reader to support the new streaming
trace API.

21 files changed, 408 insertions, 161 deletions

diff --git a/opendc-experiments/opendc-experiments-capelin/build.gradle.kts b/opendc-experiments/opendc-experiments-capelin/build.gradle.kts
index 97ca97ec..65cebe1b 100644
--- a/opendc-experiments/opendc-experiments-capelin/build.gradle.kts
+++ b/opendc-experiments/opendc-experiments-capelin/build.gradle.kts
@@ -31,7 +31,6 @@ plugins {
 dependencies {
     api(platform(projects.opendcPlatform))
     api(projects.opendcHarness.opendcHarnessApi)
-    implementation(projects.opendcFormat)
     implementation(projects.opendcTrace.opendcTraceParquet)
     implementation(projects.opendcTrace.opendcTraceBitbrains)
     implementation(projects.opendcSimulator.opendcSimulatorCore)
@@ -45,6 +44,9 @@ dependencies {
     implementation(libs.config)
     implementation(libs.progressbar)
     implementation(libs.clikt)
+    implementation(libs.jackson.module.kotlin) {
+        exclude(group = "org.jetbrains.kotlin", module = "kotlin-reflect")
+    }
 
     implementation(libs.parquet)
     testImplementation(libs.log4j.slf4j)
diff --git a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/ExperimentHelpers.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/ExperimentHelpers.kt
index 20dd603f..46e11056 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/ExperimentHelpers.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/ExperimentHelpers.kt
@@ -48,7 +48,7 @@ import org.opendc.compute.simulator.SimHost
 import org.opendc.experiments.capelin.env.EnvironmentReader
 import org.opendc.experiments.capelin.monitor.ExperimentMetricExporter
 import org.opendc.experiments.capelin.monitor.ExperimentMonitor
-import org.opendc.format.trace.TraceReader
+import org.opendc.experiments.capelin.trace.TraceReader
 import org.opendc.simulator.compute.kernel.SimFairShareHypervisorProvider
 import org.opendc.simulator.compute.kernel.interference.VmInterferenceModel
 import org.opendc.simulator.compute.power.SimplePowerDriver
diff --git a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/ParquetTraceReader.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/ParquetTraceReader.kt
index 0f49ecd2..0bf4ada6 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/ParquetTraceReader.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/ParquetTraceReader.kt
@@ -24,8 +24,6 @@ package org.opendc.experiments.capelin.trace
 
 import org.opendc.experiments.capelin.model.CompositeWorkload
 import org.opendc.experiments.capelin.model.Workload
-import org.opendc.format.trace.TraceEntry
-import org.opendc.format.trace.TraceReader
 import org.opendc.simulator.compute.workload.SimWorkload
 
 /**
diff --git a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/RawParquetTraceReader.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/RawParquetTraceReader.kt
index 2630784b..24ff0ba1 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/RawParquetTraceReader.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/RawParquetTraceReader.kt
@@ -23,8 +23,6 @@
 package org.opendc.experiments.capelin.trace
 
 import org.apache.avro.generic.GenericData
-import org.opendc.format.trace.TraceEntry
-import org.opendc.format.trace.TraceReader
 import org.opendc.simulator.compute.workload.SimTraceWorkload
 import org.opendc.simulator.compute.workload.SimWorkload
 import org.opendc.trace.util.parquet.LocalParquetReader
diff --git a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/StreamingParquetTraceReader.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/StreamingParquetTraceReader.kt
index 9bcbdc75..61e4cab5 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/StreamingParquetTraceReader.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/StreamingParquetTraceReader.kt
@@ -30,8 +30,6 @@ import org.apache.parquet.filter2.predicate.FilterApi
 import org.apache.parquet.filter2.predicate.Statistics
 import org.apache.parquet.filter2.predicate.UserDefinedPredicate
 import org.apache.parquet.io.api.Binary
-import org.opendc.format.trace.TraceEntry
-import org.opendc.format.trace.TraceReader
 import org.opendc.simulator.compute.workload.SimTraceWorkload
 import org.opendc.simulator.compute.workload.SimWorkload
 import org.opendc.trace.util.parquet.LocalInputFile
diff --git a/opendc-format/src/main/kotlin/org/opendc/format/trace/TraceEntry.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/TraceEntry.kt
index 3ce79d69..303a6a8c 100644
--- a/opendc-format/src/main/kotlin/org/opendc/format/trace/TraceEntry.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/TraceEntry.kt
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package org.opendc.format.trace
+package org.opendc.experiments.capelin.trace
 
 import java.util.UUID
 
diff --git a/opendc-format/src/main/kotlin/org/opendc/format/trace/TraceReader.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/TraceReader.kt
index 797a88d5..08304edc 100644
--- a/opendc-format/src/main/kotlin/org/opendc/format/trace/TraceReader.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/TraceReader.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020 AtLarge Research
+ * Copyright (c) 2021 AtLarge Research
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -20,7 +20,7 @@
  * SOFTWARE.
  */
 
-package org.opendc.format.trace
+package org.opendc.experiments.capelin.trace
 
 /**
  * An interface for reading workloads into memory.
diff --git a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/WorkloadSampler.kt b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/WorkloadSampler.kt
index 6de3f265..cb32ce88 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/WorkloadSampler.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/main/kotlin/org/opendc/experiments/capelin/trace/WorkloadSampler.kt
@@ -26,7 +26,6 @@ import mu.KotlinLogging
 import org.opendc.experiments.capelin.model.CompositeWorkload
 import org.opendc.experiments.capelin.model.SamplingStrategy
 import org.opendc.experiments.capelin.model.Workload
-import org.opendc.format.trace.TraceEntry
 import org.opendc.simulator.compute.workload.SimWorkload
 import java.util.*
 import kotlin.random.Random
diff --git a/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt b/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt
index 9d6329d1..2934bbe6 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt
@@ -42,7 +42,7 @@ import org.opendc.experiments.capelin.monitor.ExperimentMonitor
 import org.opendc.experiments.capelin.trace.ParquetTraceReader
 import org.opendc.experiments.capelin.trace.PerformanceInterferenceReader
 import org.opendc.experiments.capelin.trace.RawParquetTraceReader
-import org.opendc.format.trace.TraceReader
+import org.opendc.experiments.capelin.trace.TraceReader
 import org.opendc.simulator.compute.kernel.interference.VmInterferenceModel
 import org.opendc.simulator.compute.workload.SimWorkload
 import org.opendc.simulator.core.runBlockingSimulation
diff --git a/opendc-experiments/opendc-experiments-energy21/build.gradle.kts b/opendc-experiments/opendc-experiments-energy21/build.gradle.kts
index bc05f09b..7d34d098 100644
--- a/opendc-experiments/opendc-experiments-energy21/build.gradle.kts
+++ b/opendc-experiments/opendc-experiments-energy21/build.gradle.kts
@@ -31,7 +31,6 @@ plugins {
 dependencies {
     api(platform(projects.opendcPlatform))
     api(projects.opendcHarness.opendcHarnessApi)
-    implementation(projects.opendcFormat)
     implementation(projects.opendcSimulator.opendcSimulatorCore)
     implementation(projects.opendcSimulator.opendcSimulatorCompute)
     implementation(projects.opendcSimulator.opendcSimulatorFailures)
diff --git a/opendc-format/src/main/kotlin/org/opendc/format/trace/wtf/WtfTraceReader.kt b/opendc-format/src/main/kotlin/org/opendc/format/trace/wtf/WtfTraceReader.kt
deleted file mode 100644
index e8e72f0e..00000000
--- a/opendc-format/src/main/kotlin/org/opendc/format/trace/wtf/WtfTraceReader.kt
+++ /dev/null
@@ -1,126 +0,0 @@
-/*
- * 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 org.opendc.format.trace.wtf
-
-import org.apache.avro.generic.GenericRecord
-import org.opendc.format.trace.TraceEntry
-import org.opendc.format.trace.TraceReader
-import org.opendc.simulator.compute.workload.SimFlopsWorkload
-import org.opendc.trace.util.parquet.LocalParquetReader
-import org.opendc.workflow.api.Job
-import org.opendc.workflow.api.Task
-import org.opendc.workflow.api.WORKFLOW_TASK_CORES
-import org.opendc.workflow.api.WORKFLOW_TASK_DEADLINE
-import java.io.File
-import java.nio.file.Path
-import java.util.UUID
-import kotlin.math.min
-
-/**
- * A [TraceReader] for the Workflow Trace Format (WTF). See the Workflow Trace Archive
- * (https://wta.atlarge-research.com/) for more information about the format.
- *
- * @param path The path to the trace.
- */
-public class WtfTraceReader(path: Path) : TraceReader<Job> {
-    /**
-     * The internal iterator to use for this reader.
-     */
-    private val iterator: Iterator<TraceEntry<Job>>
-
-    /**
-     * Construct a [TraceReader] from the specified [path].
-     *
-     * @param path The path to the trace.
-     */
-    public constructor(path: File) : this(path.toPath())
-
-    /**
-     * Initialize the reader.
-     */
-    init {
-        val workflows = mutableMapOf<Long, Job>()
-        val starts = mutableMapOf<Long, Long>()
-        val tasks = mutableMapOf<Long, Task>()
-        val taskDependencies = mutableMapOf<Task, List<Long>>()
-
-        LocalParquetReader<GenericRecord>(path.resolve("tasks/schema-1.0")).use { reader ->
-            while (true) {
-                val nextRecord = reader.read() ?: break
-
-                val workflowId = nextRecord.get("workflow_id") as Long
-                val taskId = nextRecord.get("id") as Long
-                val submitTime = nextRecord.get("ts_submit") as Long
-                val runtime = nextRecord.get("runtime") as Long
-                val cores = (nextRecord.get("resource_amount_requested") as Double).toInt()
-
-                @Suppress("UNCHECKED_CAST")
-                val dependencies = (nextRecord.get("parents") as ArrayList<GenericRecord>).map {
-                    it.get("item") as Long
-                }
-
-                val flops: Long = 4100 * (runtime / 1000) * cores
-
-                val workflow = workflows.getOrPut(workflowId) {
-                    Job(UUID(0L, workflowId), "<unnamed>", HashSet())
-                }
-                val workload = SimFlopsWorkload(flops)
-                val task = Task(
-                    UUID(0L, taskId),
-                    "<unnamed>",
-                    HashSet(),
-                    mapOf(
-                        "workload" to workload,
-                        WORKFLOW_TASK_CORES to cores,
-                        WORKFLOW_TASK_DEADLINE to runtime
-                    )
-                )
-
-                starts.merge(workflowId, submitTime, ::min)
-                (workflow.tasks as MutableSet<Task>).add(task)
-                tasks[taskId] = task
-                taskDependencies[task] = dependencies
-            }
-        }
-
-        // Fix dependencies and dependents for all tasks
-        taskDependencies.forEach { (task, dependencies) ->
-            (task.dependencies as MutableSet<Task>).addAll(
-                dependencies.map { taskId ->
-                    tasks[taskId] ?: throw IllegalArgumentException("Dependency task with id $taskId not found")
-                }
-            )
-        }
-
-        // Create the entry iterator
-        iterator = workflows.map { (id, job) -> TraceEntry(job.uid, job.name, starts.getValue(id), job, job.metadata) }
-            .sortedBy { it.start }
-            .iterator()
-    }
-
-    override fun hasNext(): Boolean = iterator.hasNext()
-
-    override fun next(): TraceEntry<Job> = iterator.next()
-
-    override fun close() {}
-}
diff --git a/opendc-trace/opendc-trace-wtf/build.gradle.kts b/opendc-trace/opendc-trace-wtf/build.gradle.kts
new file mode 100644
index 00000000..5051c7b0
--- /dev/null
+++ b/opendc-trace/opendc-trace-wtf/build.gradle.kts
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+description = "Support for Workflow Trace Format (WTF) traces in OpenDC"
+
+/* Build configuration */
+plugins {
+    `kotlin-library-conventions`
+    `testing-conventions`
+    `jacoco-conventions`
+}
+
+dependencies {
+    api(platform(projects.opendcPlatform))
+    api(projects.opendcTrace.opendcTraceApi)
+
+    implementation(projects.opendcTrace.opendcTraceParquet)
+}
diff --git a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTable.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTable.kt
new file mode 100644
index 00000000..be26f540
--- /dev/null
+++ b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTable.kt
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.trace.wtf
+
+import org.apache.avro.generic.GenericRecord
+import org.opendc.trace.*
+import org.opendc.trace.util.parquet.LocalParquetReader
+import java.nio.file.Path
+
+/**
+ * A [Table] containing the tasks in a GWF trace.
+ */
+internal class WtfTaskTable(private val path: Path) : Table {
+    override val name: String = TABLE_TASKS
+
+    override val isSynthetic: Boolean = false
+
+    override fun isSupported(column: TableColumn<*>): Boolean {
+        return when (column) {
+            TASK_ID -> true
+            TASK_WORKFLOW_ID -> true
+            TASK_SUBMIT_TIME -> true
+            TASK_WAIT_TIME -> true
+            TASK_RUNTIME -> true
+            TASK_REQ_NCPUS -> true
+            TASK_PARENTS -> true
+            TASK_CHILDREN -> true
+            TASK_GROUP_ID -> true
+            TASK_USER_ID -> true
+            else -> false
+        }
+    }
+
+    override fun newReader(): TableReader {
+        val reader = LocalParquetReader<GenericRecord>(path.resolve("tasks/schema-1.0"))
+        return WtfTaskTableReader(reader)
+    }
+
+    override fun newReader(partition: String): TableReader {
+        throw IllegalArgumentException("Invalid partition $partition")
+    }
+
+    override fun toString(): String = "WtfTaskTable"
+}
diff --git a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTableReader.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTableReader.kt
new file mode 100644
index 00000000..b6789542
--- /dev/null
+++ b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTableReader.kt
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.trace.wtf
+
+import org.apache.avro.generic.GenericRecord
+import org.opendc.trace.*
+import org.opendc.trace.util.parquet.LocalParquetReader
+
+/**
+ * A [TableReader] implementation for the WTF format.
+ */
+internal class WtfTaskTableReader(private val reader: LocalParquetReader<GenericRecord>) : TableReader {
+    /**
+     * The current record.
+     */
+    private var record: GenericRecord? = null
+
+    override fun nextRow(): Boolean {
+        record = reader.read()
+        return record != null
+    }
+
+    override fun hasColumn(column: TableColumn<*>): Boolean {
+        return when (column) {
+            TASK_ID -> true
+            TASK_WORKFLOW_ID -> true
+            TASK_SUBMIT_TIME -> true
+            TASK_WAIT_TIME -> true
+            TASK_RUNTIME -> true
+            TASK_REQ_NCPUS -> true
+            TASK_PARENTS -> true
+            TASK_CHILDREN -> true
+            TASK_GROUP_ID -> true
+            TASK_USER_ID -> true
+            else -> false
+        }
+    }
+
+    override fun <T> get(column: TableColumn<T>): T {
+        val record = checkNotNull(record) { "Reader in invalid state" }
+
+        @Suppress("UNCHECKED_CAST")
+        val res: Any = when (column) {
+            TASK_ID -> record["id"]
+            TASK_WORKFLOW_ID -> record["workflow_id"]
+            TASK_SUBMIT_TIME -> record["ts_submit"]
+            TASK_WAIT_TIME -> record["wait_time"]
+            TASK_RUNTIME -> record["runtime"]
+            TASK_REQ_NCPUS -> (record["resource_amount_requested"] as Double).toInt()
+            TASK_PARENTS -> (record["parents"] as ArrayList<GenericRecord>).map { it["item"] as Long }.toSet()
+            TASK_CHILDREN -> (record["children"] as ArrayList<GenericRecord>).map { it["item"] as Long }.toSet()
+            TASK_GROUP_ID -> record["group_id"]
+            TASK_USER_ID -> record["user_id"]
+            else -> throw IllegalArgumentException("Invalid column")
+        }
+
+        @Suppress("UNCHECKED_CAST")
+        return res as T
+    }
+
+    override fun getBoolean(column: TableColumn<Boolean>): Boolean {
+        throw IllegalArgumentException("Invalid column")
+    }
+
+    override fun getInt(column: TableColumn<Int>): Int {
+        val record = checkNotNull(record) { "Reader in invalid state" }
+
+        return when (column) {
+            TASK_REQ_NCPUS -> (record["resource_amount_requested"] as Double).toInt()
+            TASK_GROUP_ID -> record["group_id"] as Int
+            TASK_USER_ID -> record["user_id"] as Int
+            else -> throw IllegalArgumentException("Invalid column")
+        }
+    }
+
+    override fun getLong(column: TableColumn<Long>): Long {
+        val record = checkNotNull(record) { "Reader in invalid state" }
+
+        return when (column) {
+            TASK_ID -> record["id"] as Long
+            TASK_WORKFLOW_ID -> record["workflow_id"] as Long
+            TASK_SUBMIT_TIME -> record["ts_submit"] as Long
+            TASK_WAIT_TIME -> record["wait_time"] as Long
+            TASK_RUNTIME -> record["runtime"] as Long
+            else -> throw IllegalArgumentException("Invalid column")
+        }
+    }
+
+    override fun getDouble(column: TableColumn<Double>): Double {
+        throw IllegalArgumentException("Invalid column")
+    }
+
+    override fun close() {
+        reader.close()
+    }
+}
diff --git a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTrace.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTrace.kt
new file mode 100644
index 00000000..7eff0f5a
--- /dev/null
+++ b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTrace.kt
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.trace.wtf
+
+import org.opendc.trace.TABLE_TASKS
+import org.opendc.trace.Table
+import org.opendc.trace.Trace
+import java.nio.file.Path
+
+/**
+ * [Trace] implementation for the WTF format.
+ */
+public class WtfTrace internal constructor(private val path: Path) : Trace {
+    override val tables: List<String> = listOf(TABLE_TASKS)
+
+    override fun containsTable(name: String): Boolean = TABLE_TASKS == name
+
+    override fun getTable(name: String): Table? {
+        if (!containsTable(name)) {
+            return null
+        }
+
+        return WtfTaskTable(path)
+    }
+
+    override fun toString(): String = "SwfTrace[$path]"
+}
diff --git a/opendc-format/src/test/kotlin/org/opendc/format/trace/wtf/WtfTraceReaderTest.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTraceFormat.kt
index 31ae03e0..781cb335 100644
--- a/opendc-format/src/test/kotlin/org/opendc/format/trace/wtf/WtfTraceReaderTest.kt
+++ b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTraceFormat.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020 AtLarge Research
+ * Copyright (c) 2021 AtLarge Research
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -20,28 +20,22 @@
  * SOFTWARE.
  */
 
-package org.opendc.format.trace.wtf
+package org.opendc.trace.wtf
 
-import org.junit.jupiter.api.Assertions.*
-import org.junit.jupiter.api.Test
-import java.io.File
+import org.opendc.trace.spi.TraceFormat
+import java.net.URL
+import java.nio.file.Paths
+import kotlin.io.path.exists
 
 /**
- * Test suite for the [WtfTraceReader] class.
+ * A [TraceFormat] implementation for the Workflow Trace Format (WTF).
  */
-class WtfTraceReaderTest {
-    /**
-     * Smoke test for parsing WTF traces.
-     */
-    @Test
-    fun testParseWtf() {
-        val reader = WtfTraceReader(File("src/test/resources/wtf-trace"))
-        var entry = reader.next()
-        assertEquals(0, entry.start)
-        assertEquals(23, entry.workload.tasks.size)
+public class WtfTraceFormat : TraceFormat {
+    override val name: String = "wtf"
 
-        entry = reader.next()
-        assertEquals(333387, entry.start)
-        assertEquals(23, entry.workload.tasks.size)
+    override fun open(url: URL): WtfTrace {
+        val path = Paths.get(url.toURI())
+        require(path.exists()) { "URL $url does not exist" }
+        return WtfTrace(path)
     }
 }
diff --git a/opendc-trace/opendc-trace-wtf/src/main/resources/META-INF/services/org.opendc.trace.spi.TraceFormat b/opendc-trace/opendc-trace-wtf/src/main/resources/META-INF/services/org.opendc.trace.spi.TraceFormat
new file mode 100644
index 00000000..32da52ff
--- /dev/null
+++ b/opendc-trace/opendc-trace-wtf/src/main/resources/META-INF/services/org.opendc.trace.spi.TraceFormat
@@ -0,0 +1 @@
+org.opendc.trace.wtf.WtfTraceFormat
diff --git a/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt b/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt
new file mode 100644
index 00000000..a05a523e
--- /dev/null
+++ b/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.trace.wtf
+
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import org.opendc.trace.*
+import java.io.File
+import java.net.URL
+
+/**
+ * Test suite for the [WtfTraceFormat] class.
+ */
+class WtfTraceFormatTest {
+    @Test
+    fun testTraceExists() {
+        val input = File("src/test/resources/wtf-trace").toURI().toURL()
+        val format = WtfTraceFormat()
+        org.junit.jupiter.api.assertDoesNotThrow {
+            format.open(input)
+        }
+    }
+
+    @Test
+    fun testTraceDoesNotExists() {
+        val input = File("src/test/resources/wtf-trace").toURI().toURL()
+        val format = WtfTraceFormat()
+        assertThrows<IllegalArgumentException> {
+            format.open(URL(input.toString() + "help"))
+        }
+    }
+
+    @Test
+    fun testTables() {
+        val input = File("src/test/resources/wtf-trace").toURI().toURL()
+        val format = WtfTraceFormat()
+        val trace = format.open(input)
+
+        assertEquals(listOf(TABLE_TASKS), trace.tables)
+    }
+
+    @Test
+    fun testTableExists() {
+        val input = File("src/test/resources/wtf-trace").toURI().toURL()
+        val format = WtfTraceFormat()
+        val table = format.open(input).getTable(TABLE_TASKS)
+
+        assertNotNull(table)
+        org.junit.jupiter.api.assertDoesNotThrow { table!!.newReader() }
+    }
+
+    @Test
+    fun testTableDoesNotExist() {
+        val input = File("src/test/resources/wtf-trace").toURI().toURL()
+        val format = WtfTraceFormat()
+        val trace = format.open(input)
+
+        assertFalse(trace.containsTable("test"))
+        assertNull(trace.getTable("test"))
+    }
+
+    /**
+     * Smoke test for parsing WTF traces.
+     */
+    @Test
+    fun testTableReader() {
+        val input = File("src/test/resources/wtf-trace")
+        val trace = WtfTraceFormat().open(input.toURI().toURL())
+        val reader = trace.getTable(TABLE_TASKS)!!.newReader()
+
+        assertAll(
+            { assertTrue(reader.nextRow()) },
+            { assertEquals(362334516345962206, reader.getLong(TASK_ID)) },
+            { assertEquals(1078341553348591493, reader.getLong(TASK_WORKFLOW_ID)) },
+            { assertEquals(245604, reader.getLong(TASK_SUBMIT_TIME)) },
+            { assertEquals(8163, reader.getLong(TASK_RUNTIME)) },
+            { assertEquals(setOf(584055316413447529, 133113685133695608, 1008582348422865408), reader.get(TASK_PARENTS)) },
+        )
+
+        assertAll(
+            { assertTrue(reader.nextRow()) },
+            { assertEquals(502010169100446658, reader.getLong(TASK_ID)) },
+            { assertEquals(1078341553348591493, reader.getLong(TASK_WORKFLOW_ID)) },
+            { assertEquals(251325, reader.getLong(TASK_SUBMIT_TIME)) },
+            { assertEquals(8216, reader.getLong(TASK_RUNTIME)) },
+            { assertEquals(setOf(584055316413447529, 133113685133695608, 1008582348422865408), reader.get(TASK_PARENTS)) },
+        )
+
+        reader.close()
+    }
+
+    @Test
+    fun testTableReaderPartition() {
+        val input = File("src/test/resources/wtf-trace").toURI().toURL()
+        val format = WtfTraceFormat()
+        val table = format.open(input).getTable(TABLE_TASKS)!!
+
+        assertThrows<IllegalArgumentException> { table.newReader("test") }
+    }
+}
diff --git a/opendc-format/src/test/resources/wtf-trace/tasks/schema-1.0/part.0.parquet b/opendc-trace/opendc-trace-wtf/src/test/resources/wtf-trace/tasks/schema-1.0/part.0.parquet
index d2044038..d2044038 100644
--- a/opendc-format/src/test/resources/wtf-trace/tasks/schema-1.0/part.0.parquet
+++ b/opendc-trace/opendc-trace-wtf/src/test/resources/wtf-trace/tasks/schema-1.0/part.0.parquet
diff --git a/opendc-web/opendc-web-runner/build.gradle.kts b/opendc-web/opendc-web-runner/build.gradle.kts
index 1f705b79..ec4a4673 100644
--- a/opendc-web/opendc-web-runner/build.gradle.kts
+++ b/opendc-web/opendc-web-runner/build.gradle.kts
@@ -36,7 +36,6 @@ application {
 dependencies {
     api(platform(projects.opendcPlatform))
     implementation(projects.opendcCompute.opendcComputeSimulator)
-    implementation(projects.opendcFormat)
     implementation(projects.opendcExperiments.opendcExperimentsCapelin)
     implementation(projects.opendcSimulator.opendcSimulatorCore)
     implementation(projects.opendcTelemetry.opendcTelemetrySdk)
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 73d9a151..5cae0a31 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -30,7 +30,6 @@ include(":opendc-workflow:opendc-workflow-service")
 include(":opendc-faas:opendc-faas-api")
 include(":opendc-faas:opendc-faas-service")
 include(":opendc-faas:opendc-faas-simulator")
-include(":opendc-format")
 include(":opendc-experiments:opendc-experiments-capelin")
 include(":opendc-experiments:opendc-experiments-energy21")
 include(":opendc-experiments:opendc-experiments-serverless20")
@@ -49,6 +48,7 @@ include(":opendc-telemetry:opendc-telemetry-sdk")
 include(":opendc-trace:opendc-trace-api")
 include(":opendc-trace:opendc-trace-gwf")
 include(":opendc-trace:opendc-trace-swf")
+include(":opendc-trace:opendc-trace-wtf")
 include(":opendc-trace:opendc-trace-bitbrains")
 include(":opendc-trace:opendc-trace-parquet")
 include(":opendc-harness:opendc-harness-api")