Wait, I reread what Jacque posted. Is the data being saved in the web app itself?? Is that a good idea?
Bob S > On Aug 8, 2025, at 8:03 AM, Bob Sneidar via use-livecode > <use-livecode@lists.runrev.com> wrote: > > Race conditions can be worse than that. Person A makes changes, person B also > makes changes, person B saves his changes before person A, person A saves his > changes overwriting person B changes, person B does not know about it. The > solution to that is to set a counter that gets read when starting an edit, > then check to ensure the counter is the same before saving. Upon saving > increment counter by 1 with a rollover at max value. Another thing that can > be done is to set the counter to the maximum when starting an edit, so that > subsequent edits will know the form has been locked. > > Bob S > > > On Aug 7, 2025, at 3:31 PM, J. Landman Gay via use-livecode > <use-livecode@lists.runrev.com> wrote: > > A web app runs in a browser; that's the main difference. LC Create makes web > apps. > > It occurred to me that you will need to deal with race conditions, whether > the app is a web app or a standalone that reads a stack from a server. A race > condition is when more than one person is using the app at the same time. One > person saves changes and it is uploaded to the server. If another person is > using the app simultaneously and then saves their own changes, it will > overwrite the first person's changes. To deal with that you'll need to set > some sort of flag that the standalone checks before sending changes to the > server. Usually the flag is just a plain text file. If the flag is set to > true, the app needs to wait until the flag is false before redownloading the > changed stack, applying the second user's changes, and then uploading the > revised stack to the server again. > > I've never had to deal with that since all my own work has been static and > the working stack has always been read-only (mostly educational materials.) I > remember that Andre was very cautious about race conditions and posted his > technique on the mailing list some years ago but unfortunately I didn't save > it. > > -- > Jacqueline Landman Gay | > jac...@hyperactivesw.com<mailto:jac...@hyperactivesw.com> > HyperActive Software | > http://www.hyperactivesw.com<http://www.hyperactivesw.com/> > On August 7, 2025 4:12:28 PM Craig Newman via use-livecode > <use-livecode@lists.runrev.com<mailto:use-livecode@lists.runrev.com>> wrote: > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode