To make it separate from our existing functional-based programming, we have created a new controller that will expose some of the methods in a RESTful way, using the newly created ReactiveMovieRepository:

@RestController
public class MovieController {
  @Autowired
  private ReactiveMovieRepository reactiveMovieRepository;
  @GetMapping("/movies")
  public Flux<Movie> getAllMovies() {
      return reactiveMovieRepository.findAll();
  }
  @GetMapping("/movies/{genre}")
  public Flux<Movie> getAllMoviesByGenre(@PathVariable String genre) {
      return reactiveMovieRepository.findByGenre(genre);
  }
  @GetMapping("/movies/{title}/{genre}")
  public Flux<Movie> getAllMoviesByTitleAndGenre
    (@PathVariable String title, @PathVariable String genre) {
      return reactiveMovieRepository.findByTitleAndGenre(title, genre);
  }
  @PostMapping("/movies")
  public Mono<Movie> createMovies(@Valid @RequestBody Movie movie) {
      return reactiveMovieRepository.save(movie);
  }
}

The class is quite straightforward; each method has appropriate mapping and uses corresponding repository classes to actually do the job.