*/
public void addData(AbstractStatisticCollector collector,
SessionStatistic data) {
if (activeCollectors == null || activeCollectors.isEmpty()) {
log.warn("There are no active SessionCollectors left,"
+ " but we were called from one anyhow.", new StackTrace());
}
// fetch the data from the collector and remove him from the active list
statistic.addAll(data);
if (activeCollectors != null) {