working on preparing journal loggin

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

bus/src/main/java/de/srsoftware/umbrella/messagebus/EventListener.java

@@ -4,5 +4,5 @@ package de.srsoftware.umbrella.messagebus;
 import de.srsoftware.umbrella.messagebus.events.Event;
 
 public interface EventListener {
-	void onEvent(Event event);
+	void onEvent(Event<?> event);
 }

bus/src/main/java/de/srsoftware/umbrella/messagebus/EventQueue.java

@@ -7,7 +7,7 @@ import de.srsoftware.umbrella.messagebus.events.Event;
 import java.net.InetSocketAddress;
 import java.util.LinkedList;
 
-public class EventQueue extends LinkedList<Event> implements AutoCloseable, EventListener {
+public class EventQueue extends LinkedList<Event<?>> implements AutoCloseable, EventListener {
 
 	private final InetSocketAddress addr;
 
@@ -29,7 +29,7 @@ public class EventQueue extends LinkedList<Event> implements AutoCloseable, Even
 	}
 
 	@Override
-	public void onEvent(Event event) {
+	public void onEvent(Event<?> event) {
 		System.getLogger(addr.toString()).log(System.Logger.Level.INFO,"adding event to queue of {1}: {0}",event.eventType(),addr);
 		add(event);
 	}

bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java

@@ -6,8 +6,8 @@ import java.util.HashSet;
 import java.util.Set;
 
 public class MessageBus {
-	private static MessageBus SINGLETON = new MessageBus();
-	private Set<EventListener> listeners = new HashSet<>();
+	private static final MessageBus SINGLETON = new MessageBus();
+	private final Set<EventListener> listeners = new HashSet<>();
 
 	private MessageBus(){}