question: public void receive ( final CallEvent event ) { if ( event . isValid ( ) ) { if ( ! mEvents . contains ( event ) ) { mEvents . add ( 0 , event ) ; fireTableRowsInserted ( 0 , 0 ) ; prune ( ) ; } else { int row = mEvents . indexOf ( event ) ; fireTableRowsUpdated ( row , row ) ; } } else { if ( mEvents . contains ( event ) ) { int row = mEvents . indexOf ( event ) ; mEvents . remove ( event ) ; fireTableRowsDeleted ( row , row ) ; } } }
target:  Adds, updates or deletes the event from the model.  Producers can send the same call event multiple times to indicate that information in the event is updated.  Producers can also mark the event as invalid and the event will be removed from the model.