From 4f816318b6672d40f23b22ca44cc06b77cadf961 Mon Sep 17 00:00:00 2001
From: mjkwiatkowski <mati.rewa@gmail.com>
Date: Mon, 23 Feb 2026 12:05:58 +0100
Subject: feat: added a working connection to Redis, and a scaffolding for the
 RESTful API

---
 .../kotlin/org/opendc/common/utils/HTTPClient.kt   | 50 ++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 opendc-common/src/main/kotlin/org/opendc/common/utils/HTTPClient.kt

(limited to 'opendc-common/src/main/kotlin/org/opendc/common/utils/HTTPClient.kt')

diff --git a/opendc-common/src/main/kotlin/org/opendc/common/utils/HTTPClient.kt b/opendc-common/src/main/kotlin/org/opendc/common/utils/HTTPClient.kt
new file mode 100644
index 00000000..cc89d48f
--- /dev/null
+++ b/opendc-common/src/main/kotlin/org/opendc/common/utils/HTTPClient.kt
@@ -0,0 +1,50 @@
+package org.opendc.common.utils
+
+import java.io.File
+import java.net.URI
+import java.net.http.*
+import java.net.http.HttpResponse.BodyHandlers.ofString
+/**
+ * Singleton class representing the real datacenter client.
+ * The client is asynchronous and initiates the connection first.
+ *
+ * @constructor Initiates the connection.
+ *
+ * @author Mateusz Kwiatkowski
+ */
+
+public class HTTPClient private constructor() {
+    public companion object {
+        private var instance: HTTPClient? = null
+        private var client: HttpClient? = null
+        private var handshake = HttpRequest.newBuilder()
+            .uri(URI.create("http://localhost:8080/"))
+            .build()
+
+        public fun getInstance(): HTTPClient? {
+            if (instance == null) {
+                try {
+                    client = HttpClient.newBuilder().build()
+                    val response = client?.send(handshake, ofString())
+                    check(response?.statusCode() == 200)
+                } catch (e: IllegalStateException) {
+                    println("${e.message}")
+                }
+                instance = HTTPClient()
+            }
+            return instance
+        }
+    }
+
+    // TODO: this class must send the experiment JSON file to the digital twin
+    public fun sendExperiment(experiment: File) {
+        val body : HttpRequest.BodyPublisher
+        val request = HttpRequest.newBuilder()
+            .uri(URI.create("http://localhost:8080/"))
+            .header("Content-type", "application/json")
+            // TODO: this is obviously wrong, find an efficient way to send JSON over network
+            .POST(HttpRequest.BodyPublishers.ofString(experiment))
+            .build()
+        println("Haha")
+    }
+}
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