ServiceListener.java

@ApplicationScoped
public class ServiceListener {

    public void bindService(@Observes @Specification(MyService.class) ServiceArrival event) {
        System.out.println("A new service just arrived");
        MyService arrived = event.type(MyService.class).getService();
    }

    public void unbindService(@Observes @Specification(MyService.class) ServiceDeparture event) {
        System.out.println("A service just went out");
    }
}