ADF 11g : Live messages about status/errors while uploading a Excel file

Question

Hi,
Im using ADF 11.1.1.2. In the ADF application, there is a module where the user will upload a excel sheet with lot of data(50,000 lines) in multi sheets. We are validating the data against certain business validations and inserting this data into Database tables once all the validations are successful. In case any validation errors are there we write them into a log file and send it to the user.
Now the requirement we are stuck with is to show the validation messages/errors on a screen while the upload is in progress. The messages are to be live i.e in case now the code is validating row 10 and there is a error then that error message with row number is to be displayed on the screen and when the validation process continues with row 11, we need to show message saying 'Row 11 validation in process...'.
thanks,
Manasa.

Answer 1

For this you can use a progress bar together with an DefaultBoundedRangeModel where you run the validation in a thread. This thread put the messages somewhere where the UI picks them up.
On the other side, your requirement is hard to do. I did some math: 50,000 records to validate and you want to show a message for each row; If each message need only a second you end up with more then 12 hours of work. Nobody will stare at the screen for that long. If the validation takes longer then a second it gets worse. If you show the message for less then a second, the user can read it anyway, so you don't need to show a message for every row.
We do this kind of work in the background. The user has to ask for the progress of the process and can look at errors reported so far. This way the user can do something else even if the job runs for a long time.
Timo