下面是我的代碼:Java的8個流已在運行或關閉
void deleteTranslationIfUpdated(Stream<MediaTranslation> from, Stream<MediaTranslationDTO> data) {
Stream<MediaTranslation> newLogos = data
.map(mediaTranslationMapper::mapToEntity)
.collect(Collectors.toList())
.stream();
from.filter(e ->
newLogos.noneMatch(it ->
Objects.equals(e.getLang(), it.getLang()) && Objects.equals(e.getValue().getLink(), it.getValue().getLink())))
.map(MediaTranslation::getValue)
.map(Media::getLink)
.filter(this::isNotHttpLink)
.forEach(storageService::delete);
}
以上函數是從下面的函數調用:
@Secured({AuthoritiesConstants.USER})
public BrandDTO update(String id, BrandDTO data) throws EntityNotFound {
log.debug("Request to update Brand : {} with {}", id, data);
return Optional.ofNullable(brandRepository.findOne(id))
.map(from -> {
mediaService.deleteTranslationIfUpdated(from.getLogo().stream(), data.getLogo().stream());
return from;
})
.map(target -> brandMapper.updateFromDto(data, target))
.map(brandRepository::save)
.map(brandMapper::mapToDto)
.map(this::copyCategoriesInZone)
.orElseThrow(EntityNotFound::new);
}
每當我這樣做,我得到的以下錯誤:
java.lang.IllegalStateException: stream has already been operated upon or closed at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:229) at java.util.stream.ReferencePipeline.noneMatch(ReferencePipeline.java:459) at com.nearbuy.mall.service.MediaService.lambda$deleteTranslationIfUpdated$4(MediaService.java:62)
我得到newLogos.noneMatch上述錯誤... .. :(
我不知道爲什麼。
謝謝,快速回復,第101課的經驗教訓:) –