Hi All, I have a quick question which seems to be a common topic here but I cant find a clear answer. Hope you can help.
My application allows users to download a blob of data and edit it. The blob cannot be merged so while the data is in use I need to "lock" the data allowing others read only access. I concerned that there is no guaranteed way to grant a user this lock. Is this possible? Is there preferable strategy? I was thinking something like this write --> attempt to take ownership of file by appending my email to a list read <-- check that lock was granted to me and only me. Only my email in the list. read <-- grab the blob do my work write --> save the blob and clear the owner list I can make this work if the read is guaranteed to happen _after_ the write of ownership info. Are read write operations guaranteed to occur in the order I call them in the script. ? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
