We can now add in the controller methods to retrieve details using StockMongoReactiveCrudRepository:

    @RestController
    public class StockPriceEventController {
      private final StockMongoReactiveCrudRepository repository;
      public StockPriceEventController(
      StockMongoReactiveCrudRepository repository) {
        this.repository = repository;
     }

   @GetMapping("/stocks")
   Flux<Stock> list() {
     return this.repository.findAll().log();
   }

   @GetMapping("/stocks/{code}")
   Mono<Stock> findById(@PathVariable("code") String code) {
     return this.repository.findById(code).log();
   }
  }

A few important things to note are as follows:

• private final StockMongoReactiveCrudRepository repository: StockMongoReactiveCrudRepository is injected in using the constructor injection.
• @GetMapping("/stocks") Flux<Stock> list(): Exposes a GET method to retrieve a list of stocks. Returns a Flux indicating that this would be a stream of stocks.
• @GetMapping("/stocks/{code}") Mono<Stock> findById(@PathVariable("code") String code): findById returns a Mono, indicating that it would return 0 or 1 stock element(s).