Added Interface for classes, which load their data asynchrone

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/client/RequiresDataInitialization.java

@@ -0,0 +1,13 @@
+package com.sap.sailing.gwt.ui.client;
+
+/**
+ * This is used by UI-Components, which require asynchronous data initialization (for example RaceMap, Charts or the Leaderboard)
+ * @author Lennart Hensler (D054527)
+ *
+ */
+public interface RequiresDataInitialization {
+
+    public void initializeData();
+    public boolean isDataInitialized();
+    
+}