@Reference(service = EventEngine.class,
               cardinality = ReferenceCardinality.MANDATORY)
    protected void setEventService(EventEngine service) {
        this.eventService = service;
    }
@ Reference ( service = EventEngine . class , cardinality = ReferenceCardinality . MANDATORY ) protected void setEventService ( EventEngine service ) { this . eventService = service ; }
DS method for setting the event reference.

@param service