TopologyMappingController.java

@RestController
class TopologyController {
  
    @GetMapping(path = "/uno", produces = {APPLICATION_JSON_VALUE})
    ...
    public Mono<UnoTopologyDto> getUnoTopology(
           @RequestParam Set<String> stationNames,
           @RequestParam(name = "replicationId", required = false) Long replicationId,
           @RequestParam(name = "topoReferenceDate", required = false)
           @DateTimeFormat(iso = DateTimeFormat.ISO.DATE) LocalDate topoReferenceDate) {
        final UnoTopologyRef unoTopologyRef = UnoTopologyRef.builder()
                .stationNames(stationNames)
                .replicationId(replicationId)
                .topoReferenceDate(requireNonNullElseGet(topoReferenceDate, LocalDate::now))
                .build();
        return Mono.justOrEmpty(unoTopologyLoader.load(unoTopologyRef));
    }
}