Spring Webflux-反应性存储库saveAllIterable <S>vs saveAllPublisher <S>

问题描述

我对webflux反​​应性存储库有一个小问题，尤其是关于saveAll Flux saveAll（Iterable var1）;的问题。与Flux saveAll（Publisher var1）;

想要比较，我写了以下内容：

@Controller
@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

    @Autowired
    private SomeReactiveRepository someReactiveRepository;

    @PostMapping(path = "/saveListInsideMono",consumes = MediaType.APPLICATION_JSON_VALUE,produces = MediaType.APPLICATION_JSON_VALUE)
    public Mono<QuestionResponse> saveListInsideMono(@RequestBody Mono<QuestionRequest> questionRequestMono) {
        //just doing some business transformation on the list inside the mono
        Mono<List<String>> enhancedStringListMono = questionRequestMono.map(questionRequest -> enhance(questionRequest));
        //take the pojo inside the mono and map it to a saveAllAndConvertToResponse method (see next method)
        Mono<QuestionResponse> questionResponseMono = enhancedStringListMono.map(enhancedStringList -> saveAllAndConvertToResponse(enhancedStringList));
        return questionResponseMono;
    }

    private QuestionResponse saveAllAndConvertToResponse(List<String> enhancedStringList) {
        // use the repository <S extends T> Flux<S> saveAll(Iterable<S> var1); + subscribe
        return someReactiveRepository.saveAll(enhancedStringList).thenReturn(new QuestionResponse(enhancedStringList));
    //this also works but not good to subscribe
        //someReactiveRepository.saveAll(enhancedStringList).subscribe();
        //return new QuestionResponse(enhancedStringList);
    }

    @PostMapping(path = "/saveFlux",produces = MediaType.APPLICATION_JSON_VALUE)
    public Mono<QuestionResponse> saveFlux(@RequestBody Mono<QuestionRequest> questionRequestMono) {
        //just doing some business transformation on the list inside the mono
        Mono<List<String>> enhancedStringListMono = questionRequestMono.map(questionRequest -> enhance(questionRequest));
        // use the repository <S extends T> Flux<S> saveAll(Publisher<S> var1); to save the flatMapMany + fromIterable directly
        Flux<String> enhancedStringFlux = someReactiveRepository.saveAll(enhancedStringListMono.flatMapMany(Flux::fromIterable));
        Mono<QuestionResponse> questionResponseMono = enhancedStringFlux.collectList().map(enhancedString -> convertToResponse(enhancedString));
        return questionResponseMono;
    }

    private QuestionResponse convertToResponse(List<String> enhancedStringList) {
        //return the object needed
        return new QuestionResponse(enhancedStringList);
    }

    private static List<String> enhance(QuestionRequest questionRequest) {
        //dummy business transformation logic
        List<String> baseList = questionRequest.getList();
        List<String> enhancedList = baseList.stream().map(oneString -> "enhanced" + oneString).collect(Collectors.toList());
        return enhancedList;
    }

    public class QuestionRequest {
        private List<String> list;

        public List<String> getList() {
            return list;
        }
    }

    public class QuestionResponse {
        private List<String> enhancedList;

        public QuestionResponse(List<String> enhancedList) {
            this.enhancedList = enhancedList;
        }
    }

}

就“正确性”而言，两个代码都在执行预期的工作。一切都成功保存了。

但是从性能，响应范例，对数据库的IO利用率，Netty Core的使用来看，什么是“最佳”解决方案，为什么呢？

谢谢

解决方法

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