With e(fx)clipse we ship as part of our core-bundle (the one able to run in any OSGi and Plain-Java-Env) since 2.1 an org.eclipse.fx.core.event.EventBus which we enhanced in 2.2.0 to provide a certain level of typesafety.

Useage is straight forward:

1. Define a Topic-Instance

   public class Constants {
     public static final org.eclipse.fx.core.event.Topic<String> MY_TOPIC 
       = new org.eclipse.fx.core.event.Topic<>("my/sample/Topic");
   }
   

2. Publishing is done with

   @PostConstruct
   public void init(org.eclipse.fx.core.event.EventBus eventBus) {
     eventBus.publish( MY_TOPIC, "Hello World!", true );
   }
   

3. Subscribing to events

   import static my.sample.Constants.MY_TOPIC;
   import static org.eclipse.fx.core.event.EventBus.data;
   
   @PostConstruct
   public void init(org.eclipse.fx.core.event.EventBus eventBus) {
     eventBus.subscribe( MY_TOPIC, data(this::handleTopic) );
   }
   
   private void handleTopic(String data) {
     // ...
   }
   

If you are interested in other new features of 2.2.0 look at this overview page