RowSet Selecting large amounts of data with progress display

Question

Java

How can this mechanism be implemented, and is it possible to find out the stage at which the request is located.

Answer 1

There is exactly one problem here - the non-determinism of the query execution time (if it is a database).
As a rule, by breaking the request into pieces (which is necessary for showing progress), an increase in execution time (usually non-linear) is obtained. so here in each case you have to decide what to sacrifice: the predictable speed of the progress bar or performance.
And if a large amount of data is taken from storage with a predictable access time, then, I think, there are no problems in principle.

Answer 2

but a simple indicator of a long operation. the slider running in a circle without a beginning and an end does not fit?