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What is the best pattern for user validation when user is away?
I have a web application that have sensitive data input. Data can be edited by admin but data validation can only be done by users. Once users completed the data, the data entered by user must be verified by admin before data being submitted.
Now I plan to validate the data when user is away. User can edit the data while the application is idle. What is the best pattern for doing that?
In my case, there is a large number of users accessing the application. The data will be validated every 5 minutes. I am not sure if it would be a good idea to validate the data every 5 minutes. So I am thinking about doing it asynchronously.
In general, this is a perfect time for using a lock-based database, such as a Read/Write Exclusive Locking Database (R/W-ELB). The user can edit the data while the application is idle.
The data validation can be performed asynchronously. After each data entry, the application checks the database to see if the validation has already been performed. If it has been, the data is accepted without any further validation. If it has not been, the user is warned that data validation is required. This ensures that the user cannot submit a duplicate request, and that the user is informed of the details of the requirements.
In my case, I would expect you to validate the data when the user is idle. Any other approach to what you want to do has a number of drawbacks. You've correctly identified a problem that has plenty of pitfalls. If I were to design the system you're describing, there would be no way to defer the validation without user/administrator feedback. You would have to follow through to the end of the process, failing the request if the validation was not performed at the time the data is entered.
I would start with a high-level requirement and use this requirement as a guide to determine if this approach is a good fit. I would start 0b46394aab