HistoryService historyService = processEngine.getHistoryService();
HistoricActivityStatisticsQuery query = historyService.createHistoricActivityStatisticsQuery(processDefinitionId);
if (includeCanceled != null && includeCanceled) {
query.includeCanceled();
}
if (includeFinished != null && includeFinished) {
query.includeFinished();
}