code: public static String getServiceName(MuleEventContext event) {
          // Mule 2.2 implementation
  		// Service    service = (event == null)? null : event.getService();
          FlowConstruct service = (event == null)? null : event.getFlowConstruct();
          String        name    = (service == null)?  "" : service.getName();
          return name;
  	}
docs: Different implementations for retrieving the service name from a MuleEventContext-object in Mule 2.2.x and Mule
  
  @param event
  @return