Data events for update handling after filtering.

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/events/DataUpdateHandler.java

@@ -0,0 +1,8 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.events;
+
+public interface DataUpdateHandler {
+
+	void add(DataUpdatedEvent ev);
+
+	boolean remove(DataUpdatedEvent ev);
+}

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/events/DataUpdatedEvent.java

@@ -0,0 +1,6 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.events;
+
+public interface DataUpdatedEvent {
+
+	void updateFinisched();
+}

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/events/DefaultDataUpdateHandler.java

@@ -0,0 +1,27 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.events;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DefaultDataUpdateHandler implements DataUpdateHandler {
+
+	private final List<DataUpdatedEvent> listeners = new ArrayList<>();
+
+	@Override
+	public void add(DataUpdatedEvent ev) {
+		listeners.add(ev);
+	}
+
+	@Override
+	public boolean remove(DataUpdatedEvent o) {
+		return listeners.remove(o);
+	}
+
+	public void fireUpdateEvent() {
+		synchronized (listeners) {
+			for (DataUpdatedEvent ev : listeners) {
+				ev.updateFinisched();
+			}
+		}
+	}
+}