public SpreadsheetinvokerCE(Spreadsheet spreadsheet) {
super(spreadsheet);
IActivity[] cellActivities = new CellActivityBuilder(spreadsheet.getCells()).buildActivities();
IScheduler scheduler = ServiceMT.getService().getScheduler(DEFAULT_CELL_TIME_NS);
this.scheduledActivities = scheduler.prepare(cellActivities);
this.scheduleExecutor = new ScheduleExecutor(scheduledActivities);
}