Update architecture

src/main/java/app/state/AppState.java

@@ -6,35 +6,47 @@ import com.google.inject.Singleton;
 import domain.common.Mode;
 import domain.events.ImageChangedEvent;
 import domain.events.ModeChangedEvent;
+import domain.events.listeners.Listener;
 import domain.image.Image;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Represents the global state of the app
  */
 @Singleton
 public class AppState extends State {
-
     private Mode mode;
     private Image rgbImage;
+    private final List<AppStateListener> listeners = new ArrayList<>();
 
     @Inject
-    public AppState(EventBus eventBus) {
-        super(eventBus);
+    public AppState() {}
+
+    public void subscribe(AppStateListener listener) {
+        listeners.add(listener);
+    }
+
+    public void unsubscribe(AppStateListener listener) {
+        listeners.remove(listener);
     }
 
     public void setMode(Mode mode) {
         this.mode = mode;
-        this.eventBus.post(new ModeChangedEvent(mode));
+        listeners.forEach(listener -> listener.onModeChanged(mode));
     }
 
     public void setImage(Image image) {
         this.rgbImage = image;
-        this.eventBus.post(new ImageChangedEvent(image));
+        listeners.forEach(listener -> listener.onImageChanged(image));
     }
 
-    public Image getImage(){
-        return this.rgbImage;
+    public Image getImage() {
+        return rgbImage;
     }
 
-    public Mode getMode() { return this.mode; }
+    public Mode getMode() {
+        return mode;
+    }
 }