chore(rest-api): add simple rest api controller

Author: AndreaGiulianelli

Diff for: src/main/kotlin/App.kt

@@ -6,9 +6,11 @@
  * https://opensource.org/licenses/MIT.
  */
 
+import infrastructure.api.APIController
+
 /**
  * Template for kotlin projects.
  */
 fun main() {
-    println("Hello World from Kotlin Template")
+    APIController().start()
 }

Diff for: src/main/kotlin/infrastructure/api/APIController.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2023. Smart Operating Block
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package infrastructure.api
+
+import io.ktor.server.application.Application
+import io.ktor.server.application.call
+import io.ktor.server.engine.embeddedServer
+import io.ktor.server.netty.Netty
+import io.ktor.server.response.respondText
+import io.ktor.server.routing.get
+import io.ktor.server.routing.routing
+
+/**
+ * It manages the REST-API of the microservice.
+ */
+class APIController {
+    /**
+     * Starts the http server to serve the client requests.
+     */
+    fun start() {
+        embeddedServer(Netty, port = 3000, module = this::dispatcher).start(wait = true)
+    }
+
+    /**
+     * Dispatcher of the http routing.
+     * Needs to be public due to reflection used by ktor.
+     */
+    fun dispatcher(app: Application) {
+        with(app) {
+            roomAPI(this)
+            medicalTechnologyPI(this)
+        }
+    }
+
+    /**
+     * The Room API available to handle room requests.
+     * @param[app] it represents the running ktor web application
+     */
+    private fun roomAPI(app: Application) {
+        with(app) {
+            routing {
+                get("/room") {
+                    call.respondText("[${Thread.currentThread().name}] Room!")
+                }
+            }
+        }
+    }
+
+    /**
+     * The Medical Technology API available to handle medical technology requests.
+     * @param[app] it represents the running ktor web application
+     */
+    private fun medicalTechnologyPI(app: Application) {
+        with(app) {
+            routing {
+                get("/medicaltechnology") {
+                    call.respondText("[${Thread.currentThread().name}] Medical Technology!")
+                }
+            }
+        }
+    }
+}