Abstraktion für Listener API erstellt

EventGenerator soll als einheitlicher Unterbau zur Umstzung von Listener Patterns dienen. Damit sollen Listener wie AudioListener oder AnimationListener umgesetzt werden.

src/schule/ngb/zm/events/EventGenerator.java

@@ -0,0 +1,50 @@
+package schule.ngb.zm.events;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.CopyOnWriteArraySet;
+import java.util.function.BiConsumer;
+
+public class EventGenerator<E, L extends Listener<E>> {
+
+	private CopyOnWriteArraySet<L> listeners;
+
+	private ConcurrentMap<String, BiConsumer<E, L>> eventRegistry;
+
+	public EventGenerator() {
+		listeners = new CopyOnWriteArraySet<>();
+		eventRegistry = new ConcurrentHashMap<>();
+	}
+
+	public void registerEventType( String eventKey, BiConsumer<E, L> dispatcher ) {
+		if( !eventRegistered(eventKey) ) {
+			eventRegistry.put(eventKey, dispatcher);
+		}
+	}
+
+	public void addListener( L listener ) {
+		listeners.add(listener);
+	}
+
+	public void removeListener( L listener ) {
+		listeners.remove(listener);
+	}
+
+	public boolean hasListeners() {
+		return !listeners.isEmpty();
+	}
+
+	public boolean eventRegistered( String eventKey ) {
+		return eventRegistry.containsKey(eventKey);
+	}
+
+	public void dispatchEvent( String eventKey, final E event ) {
+		if( eventRegistered(eventKey) ) {
+			final BiConsumer<E, L> dispatcher = eventRegistry.get(eventKey);
+			listeners.stream().forEach(( listener ) -> {
+				dispatcher.accept(event, listener);
+			});
+		}
+	}
+
+}

src/schule/ngb/zm/events/Listener.java

@@ -0,0 +1,7 @@
+package schule.ngb.zm.events;
+
+public interface Listener<E> {
+
+
+
+}