Race condition updating resource's metadata and data

[offtherailz]

doing in parallel 2 PUT requests for resource and resource/data, only the first is applied. This is because data request read the resource to get the id, updates the data and then modify last-update date in the resource, but in the meanwhile the resource has been modified.
Tipical example of critical section.

sample requests (missing authentication) :
PUT resource

curl 'http://localhost:8081/rest/geostore/resources/resource/5728' -X PUT -H 'Pragma: no-cache' -H 'Origin: http://localhost:8081' -H 'Accept-Encoding: gzip, deflate, br' -H 'Accept-Language: it' -H -H 'Content-Type: application/xml' -H 'Accept: application/json, text/plain, */*' -H 'Cache-Control: no-cache' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36' -H 'Connection: keep-alive' -H 'Referer: http://localhost:8081/?debug=true' --data-binary '<Resource><description></description><metadata></metadata><name>test dashboard 4</name></Resource>' --compressed

PUT data

curl 'http://localhost:8081/rest/geostore/data/5728' -X PUT -H 'Pragma: no-cache' -H 'Origin: http://localhost:8081' -H 'Accept-Encoding: gzip, deflate, br' -H 'Accept-Language: it' -H 'Content-Type: application/json; charset=UTF-8"' -H 'Accept: application/json, text/plain, */*' -H 'Cache-Control: no-cache' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36' -H 'Connection: keep-alive' -H 'Referer: http://localhost:8081/?debug=true' --data-binary '{"widgets":[{"id":"252bb010-49f7-11e8-9f59-630c9298622e","layer":false,"url":false,"legend":false,"mapSync":false,"widgetType":"text","dataGrid":{"y":0,"x":0,"w":1,"h":1},"title":"test","text":"<p>test</p>"}],"layouts":{"lg":[{"w":1,"h":1,"x":0,"y":0,"i":"252bb010-49f7-11e8-9f59-630c9298622e","moved":false,"static":false}],"md":[{"w":1,"h":1,"x":0,"y":0,"i":"252bb010-49f7-11e8-9f59-630c9298622e","moved":false,"static":false}],"xs":[{"w":1,"h":1,"x":0,"y":0,"i":"252bb010-49f7-11e8-9f59-630c9298622e","moved":false,"static":false}]}}' --compressed