private List<List<SpanBo>> filterList2(List<List<SpanBo>> transactionList, Filter<List<SpanBo>> filter) {
        final List<List<SpanBo>> filteredResult = new ArrayList<>();
        for (List<SpanBo> transaction : transactionList) {
            if (filter.include(transaction)) {
                filteredResult.add(transaction);
            }
        }
        return filteredResult;
    }
@author netspider
@author emeroad
@author minwoo.jung
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/service/FilteredMapServiceImpl.java