How i can detect JasperViewer processing report time

we know jasper viewer need much time to process report according to the data that will display.I want to handle it, with give the user loading information.this my step :[*]Check ,is the viewer in process or done.[*]If in process, create JLabel and set text to "Loading report..."[*]If done, set text to "" or nullAnd the point 1 , i don't know How to check viewer is in generating process?Please help me. Thank you :)
 
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