Fixed a small bug in the reading of workflows (#382)

* Fixed a small bug in the reading of workflows

* small update

* Pushing workload files needed for ExperimentCliTest 3

Author: DanteNiewenhuis

opendc-compute/opendc-compute-workload/src/main/kotlin/org/opendc/compute/workload/ComputeWorkloadLoader.kt

@@ -175,11 +175,14 @@ public class ComputeWorkloadLoader(
 
                 if (parents?.isEmpty() == true) {
                     parentsOutput = null
-                    children = null
                 } else {
                     parentsOutput = ArrayList(parents!!)
                 }
 
+                if (children?.isEmpty() == true) {
+                    children = null
+                }
+
                 var deferrable = reader.getBoolean(deferrableCol)
                 var deadline = reader.getLong(deadlineCol)
                 if (deferAll) {

opendc-experiments/opendc-experiments-base/src/test/kotlin/org/opendc/experiments/base/ExperimentCliTest.kt

@@ -57,4 +57,18 @@ class ExperimentCliTest {
         val someDir = File("output")
         someDir.deleteRecursively()
     }
+
+    /**
+     * ExperimentCli test 3
+     * This test runs the experiment defined in the experiment_3.json file.
+     *
+     * In this test, a small workflow is executed.
+     */
+    @Test
+    fun testExperimentCli3() {
+        ExperimentCommand().main(arrayOf("--experiment-path", "src/test/resources/experiments/experiment_3.json"))
+
+        val someDir = File("output")
+        someDir.deleteRecursively()
+    }
 }

opendc-experiments/opendc-experiments-base/src/test/resources/experiments/experiment_3.json

@@ -0,0 +1,26 @@
+{
+    "name": "simple",
+    "topologies": [
+        {
+            "pathToFile": "src/test/resources/topologies/workflow_topology.json"
+        }
+    ],
+    "workloads": [
+        {
+            "pathToFile": "src/test/resources/workloadTraces/workflow_example",
+            "type": "ComputeWorkload"
+        }
+    ],
+    "exportModels": [
+        {
+            "exportInterval": 60,
+            "printFrequency": 168,
+            "filesToExport": [
+                "host",
+                "powerSource",
+                "service",
+                "task"
+            ]
+        }
+    ]
+}

opendc-experiments/opendc-experiments-base/src/test/resources/topologies/workflow_topology.json

@@ -0,0 +1,23 @@
+{
+    "clusters":
+    [
+        {
+            "name": "C01",
+            "hosts" :
+            [
+                {
+                    "name": "H01",
+                    "cpu":
+                    {
+                        "coreCount": 12,
+                        "coreSpeed": 3300
+                    },
+                    "memory": {
+                        "memorySize": 140457600000
+                    },
+                    "count": 3
+                }
+            ]
+        }
+    ]
+}