Update architecture. Change mediator, add simple observer to track active 'transfers'

src/main/java/nsusbloader/Controllers/Payload.java

@@ -0,0 +1,48 @@
+/*
+    Copyright 2019-2024 Dmitry Isaenko
+     
+    This file is part of NS-USBloader.
+
+    NS-USBloader is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    NS-USBloader is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with NS-USBloader.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package nsusbloader.Controllers;
+
+import nsusbloader.NSLDataTypes.EFileStatus;
+
+import java.util.Collections;
+import java.util.Map;
+
+public class Payload {
+    private final String message;
+    private final Map<String, EFileStatus> statusMap;
+
+    public Payload(){
+        this("");
+    }
+    public Payload(String message){
+        this(message, Collections.emptyMap());
+    }
+    public Payload(String message, Map<String, EFileStatus> statusMap){
+        this.message = message;
+        this.statusMap = statusMap;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public Map<String, EFileStatus> getStatusMap() {
+        return statusMap;
+    }
+}