merge: Add provisioning tool for experiments (#104)

This pull request implements a new tool to help provision and manage the 
experimental environment.

## Implementation Notes :hammer_and_pick:

* Add service registry for cloud services 
* Add provisioning tool for experiments
* Add provisioning step for workflow service 
* Add provisioners for FaaS service 
* Use experiment base for Capelin experiments
* Use experiment base for web runner
* Integrate compute workload classes
* Remove Topology interface 

## Breaking API Changes :warning:

* Removal of the `opendc-compute-workload`, `opendc-faas-workload`, 
   and `opendc-workflow-workload` modules. These are now located 
   inside `opendc-experiments`
* Removal of `ComputeServiceHelper`. Use `Provisioner` to provision 
   a `ComputeService`.

1 files changed, 68 insertions, 0 deletions

diff --git a/opendc-experiments/opendc-experiments-base/src/main/kotlin/org/opendc/experiments/internal/ServiceRegistryImpl.kt b/opendc-experiments/opendc-experiments-base/src/main/kotlin/org/opendc/experiments/internal/ServiceRegistryImpl.kt
new file mode 100644
index 00000000..c2e91730
--- /dev/null
+++ b/opendc-experiments/opendc-experiments-base/src/main/kotlin/org/opendc/experiments/internal/ServiceRegistryImpl.kt
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2022 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.experiments.internal
+
+import org.opendc.experiments.MutableServiceRegistry
+
+/**
+ * Implementation of the [MutableServiceRegistry] interface.
+ */
+internal class ServiceRegistryImpl(private val registry: MutableMap<String, MutableMap<Class<*>, Any>> = mutableMapOf()) :
+    MutableServiceRegistry {
+    override fun <T : Any> resolve(name: String, type: Class<T>): T? {
+        val servicesForName = registry[name] ?: return null
+
+        @Suppress("UNCHECKED_CAST")
+        return servicesForName[type] as T?
+    }
+
+    override fun <T : Any> register(name: String, type: Class<T>, service: T) {
+        val services = registry.computeIfAbsent(name) { mutableMapOf() }
+
+        if (type in services) {
+            throw IllegalStateException("Duplicate service $type registered for name $name")
+        }
+
+        services[type] = service
+    }
+
+    override fun remove(name: String, type: Class<*>) {
+        val services = registry[name] ?: return
+        services.remove(type)
+    }
+
+    override fun remove(name: String) {
+        registry.remove(name)
+    }
+
+    override fun clone(): MutableServiceRegistry {
+        val res = mutableMapOf<String, MutableMap<Class<*>, Any>>()
+        registry.mapValuesTo(res) { (_, v) -> v.toMutableMap() }
+        return ServiceRegistryImpl(res)
+    }
+
+    override fun toString(): String {
+        val entries = registry.map { "${it.key}=${it.value}" }.joinToString()
+        return "ServiceRegistry{$entries}"
+    }
+}