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IT.FARMER
webflux null, empty 처리 본문
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webflux null, empty 처리
Mono / Flux
.switchIfEmpty() : Mono/Flux 가 데이터 없이 완료된 경우 이면 대체 Mono, Flux 로 대체 함.
@RequestMapping("/audience/get")
public Mono<?> findAudienceV2(ServerHttpRequest serverHttpRequest) {
try {
String serverId = serverHttpRequest.getQueryParams().getFirst("server_id");
String id = serverHttpRequest.getQueryParams().getFirst("id");
log.debug("server id = {} id = {}", serverId, id);
assert serverId != null : id != null;
Mono<List<AudienceDetailEntity>> byAudience = audienceService.findByAudienceReactiveType(id, serverId);
return byAudience.map(audienceDetailEntities -> {
Response<List<AudienceDetailEntity>> response;
response = new Response<>(Response.ResponseCode.SUCCESS.getCode(), Response.ResponseCode.SUCCESS, new Success<>(audienceDetailEntities));
response.setMessage("Completed finding audience data");
response.setUrl(serverHttpRequest.getURI().toString());
return response;
}).switchIfEmpty(Mono.defer(() -> {
List<AudienceDetailEntity> audienceDetailEntities = new ArrayList<>();
Response<List<AudienceDetailEntity>> response = new Response<>(Response.ResponseCode.SUCCESS.getCode(), Response.ResponseCode.SUCCESS, new Success<>(audienceDetailEntities));
response.setMessage("nothing audience data");
response.setUrl(serverHttpRequest.getURI().toString());
return Mono.just(response);
}));
} catch (Exception e) {
log.error("audience get error", e);
Response<?> response;
response = new Response<String>(Response.ResponseCode.ERROR.getCode(), Response.ResponseCode.ERROR, new Error<>(e.getMessage()));
response.setUrl(serverHttpRequest.getURI().toString());
response.setMessage("UNKNOWN ERROR - failed finding audience data");
return Mono.just(response);
}
}
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