return Mono.error 内部地图 Spring Webflux

Question

对于匹配条件，return Mono.error from code ，但给出了编译错误。我注释掉了

//return Mono.error(new RuntimeException("User Phone Exists already"));

结果：

Compilation Error: Required Type Mono<EventSlotBook>, Provided Mono<Object>

代码：

public Mono<EventSlotBook> getEventSlotBookWithAppointmentId(EventSlotBook eventSlotBookEntity) {

    Query query = new Query();
    query.addCriteria(
            new Criteria().andOperator(
                    Criteria.where("eventId").is(eventSlotBookEntity.getEventId()),
                    Criteria.where("eventConfigId").is(eventSlotBookEntity.getEventConfigId()),
                    Criteria.where("eventSlotId").is(eventSlotBookEntity.getEventSlotId())));

    return this.reactiveMongoTemplate.findOne(query, EventSlotBook.class)
            .map(eventSlotBookEntityFromDb -> {
                EventSlotBook eventSlotNewEntity = eventSlotBookEntityFromDb.toBuilder().build();

                if(eventSlotNewEntity.getEventUsers() != null) {
                    for(EventUser eventUserIno:eventSlotNewEntity.getEventUsers()) {
                        if(eventUserIno.getPhoneNumber().equalsIgnoreCase(eventSlotBookEntity.getEventUser().getPhoneNumber())){
                            //return Mono.error(new RuntimeException("User Phone Exists already"));
                        }
                    }
                }


                int maxTokenVal = Integer.valueOf(eventSlotNewEntity.getMaxTokenVal()).intValue() + 1;
                EventUser eventUser = new EventUser(eventSlotNewEntity.getEventUser().getName(),eventSlotNewEntity.getEventUser().getPhoneNumber(),String.valueOf(maxTokenVal));
                eventSlotNewEntity.getEventUsers().add(eventUser);
                eventSlotNewEntity.setMaxTokenVal(String.valueOf(maxTokenVal));
                eventSlotNewEntity.setEventUser(eventUser);


                return eventSlotNewEntity;
                //return Mono.error(new RuntimeException("Ts"));
            })
            .switchIfEmpty(getEventSlotBook(eventSlotBookEntity));
}

方法的调用者：我应该处理 Mono.error 和 return 以休息 API 该用户已经存在？。请对此提供帮助

public Mono<EventSlotBookRequestDto> saveEventSlotBook(Mono<EventSlotBookRequestDto> eventSlotBookRequestDtoMono){
    log.info("Start::SaveEventSlotBook");
    Mono<EventSlotBookRequestDto> eventDtoSaved =
            eventSlotBookRequestDtoMono.map(AppUtils::dtoToEntity)
                    .flatMap(eventSlotEntity -> getEventSlotBookWithAppointmentId(eventSlotEntity))
                    .doOnNext(eventSlotEntityBeforeSave -> {
                        log.info("@@@@BeforeSave::{}",eventSlotEntityBeforeSave);
                    })
                    .flatMap(eventSlotBookrepository::save)
                    .doOnNext( eventSlotBookAfterSave -> {
                        log.info("@@@@AfterSave::{}",eventSlotBookAfterSave);
                    })
                    .map(AppUtils::entityToDto);
    log.info("End::SaveEventSlotBook");
    return eventDtoSaved;
}

Answer 1

map用于将同步函数应用于每个项目，因此您不能return Mono 从中。对于 return 来自 map 的错误，您可以抛出异常并发出错误信号。作为替代方案，您可以使用 handle 运算符并使用 SynchronousSink 发出下一个或错误信号。

但是在你的情况下你需要使用 flatMap 因为 saveEventSlotBook returns Mono 并且应该被转换 asynchronously.

return Mono.error 内部地图 Spring Webflux

return Mono.error inside Map Spring Webflux

mono

spring

flux

reactive

spring-webflux