Merge branch 'osp-bench' into 'master'

Add a Patcher to handle ospbench data volume settings

See merge request !174

theodolite/src/main/kotlin/theodolite/patcher/DataVolumeLoadGeneratorReplicaPatcher.kt

+package theodolite.patcher
+
+import io.fabric8.kubernetes.api.model.KubernetesResource
+
+/**
+ * The DataVolumeLoadGeneratorReplicaPatcher takes the total load that should be generated
+ * and computes the number of instances needed for this load based on the `maxVolume`
+ * ((load + maxVolume - 1) / maxVolume) and calculates the load per instance
+ * (loadPerInstance = load / instances).
+ * The number of instances are set for the load generator and the given variable is set to the
+ * load per instance.
+ *
+ * @property k8sResource Kubernetes resource to be patched.
+ * @property maxVolume per load generator instance
+ * @property container Container to be patched.
+ * @property variableName Name of the environment variable to be patched.
+ */
+class DataVolumeLoadGeneratorReplicaPatcher(
+    k8sResource: KubernetesResource,
+    private val maxVolume: Int,
+    container: String,
+    variableName: String
+) : AbstractPatcher(k8sResource) {
+
+    private val replicaPatcher = ReplicaPatcher(k8sResource)
+    private val envVarPatcher = EnvVarPatcher(k8sResource, container, variableName)
+
+    override fun <T> patch(value: T) {
+        // calculate number of load generator instances and load per instance
+        val load = Integer.parseInt(value.toString())
+        val loadGenInstances = (load + maxVolume - 1) / maxVolume
+        val loadPerInstance = load / loadGenInstances
+
+        // Patch instance values and load value of generators
+        replicaPatcher.patch(loadGenInstances.toString())
+        envVarPatcher.patch(loadPerInstance.toString())
+    }
+}

theodolite/src/main/kotlin/theodolite/patcher/PatcherFactory.kt

@@ -48,6 +48,12 @@ class PatcherFactory {
                     k8sResource = resource,
                     loadGenMaxRecords = patcherDefinition.properties["loadGenMaxRecords"]!!
                 )
+                "DataVolumeLoadGeneratorReplicaPatcher" -> DataVolumeLoadGeneratorReplicaPatcher(
+                    k8sResource = resource,
+                    maxVolume = patcherDefinition.properties["maxVolume"]!!.toInt(),
+                    container = patcherDefinition.properties["container"]!!,
+                    variableName = patcherDefinition.properties["variableName"]!!
+                )
                 "EnvVarPatcher" -> EnvVarPatcher(
                     k8sResource = resource,
                     container = patcherDefinition.properties["container"]!!,