implemented marianum message dataloader

lib/state/app/infrastructure/dataLoader/data_loader.dart

@@ -1,3 +1,36 @@
+import 'dart:convert';
+import 'dart:developer';
+
+import 'package:dio/dio.dart';
+
 abstract class DataLoader<TResult> {
-  Future<TResult> fetch();
+  final Dio dio;
+  DataLoader(this.dio) {
+    dio.options.connectTimeout = const Duration(seconds: 10).inMilliseconds;
+    dio.options.sendTimeout = const Duration(seconds: 30).inMilliseconds;
+    dio.options.receiveTimeout = const Duration(seconds: 30).inMilliseconds;
+  }
+
+  Future<TResult> run() async {
+    var response = await fetch();
+    try {
+      return assemble(DataLoaderResult(
+        json: jsonDecode(response.data!),
+        headers: response.headers.map.map((key, value) => MapEntry(key, value.join(';'))),
+      ));
+    } catch(trace, e) {
+      log(trace.toString());
+      throw(e);
+    }
+  }
+
+  Future<Response<String>> fetch();
+  TResult assemble(DataLoaderResult data);
+}
+
+class DataLoaderResult {
+  final Map<String, dynamic> json;
+  final Map<String, String> headers;
+
+  DataLoaderResult({required this.json, required this.headers});
 }

lib/state/app/infrastructure/dataLoader/mhsl_data_loader.dart

@@ -0,0 +1,9 @@
+import 'package:dio/dio.dart';
+
+import 'data_loader.dart';
+
+abstract class MhslDataLoader<TResult> extends DataLoader<TResult> {
+  MhslDataLoader() : super(Dio(BaseOptions(
+      baseUrl: 'https://mhsl.eu/marianum/marianummobile/'
+  )));
+}