Atomic updates in Aliyun OSS

(Sorry,Idon'tspeakChinese,IpostedonStackoverflowfirst,butnooneseemstoknowAliyunOSSthere,pleaseanyonetranslatethisquestion,andkindlyalsocross-postanswerstoStackoverflow)IsthereawaytodoatomicupdatesinAliyunOSS?replaceanobjectonlyifitexistsandthecurrentversionmatchesagivenETaguploadanobjectonlyifitdoesnotexistSinceOSSappearstobeheavilyinspiredbyAmazonS3,answersforS3arepossiblyapplicableandalsoappreciated.Ifthatmakesadifference,IamusingtheJavaAPI.

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