@Override
    public LimitedScanResult<List<TransactionId>> selectTraceIdsFromApplicationTraceIndex(String applicationName, Range range, int limit, boolean backwardDirection) {
        Objects.requireNonNull(applicationName, "applicationName");
        Objects.requireNonNull(range, "range");

        if (logger.isTraceEnabled()) {
            logger.trace("scan(selectTraceIdsFromApplicationTraceIndex) {}, {}", applicationName, range);
        }

        return this.applicationTraceIndexDao.scanTraceIndex(applicationName, range, limit, backwardDirection);
    }
@author netspider
@author emeroad
@author minwoo.jung
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/service/FilteredMapServiceImpl.java