code: public int updateQueue() throws IOException {
  		int added = 0;
  		long lastMarkPoint = lastMark.getLastMark();
  		long currentMarkPoint = db.getCurrentMark();
  		if(currentMarkPoint > lastMarkPoint) {
  			// TODO: touchy touchy... need transactions here to not have 
  			// state sync problems if something goes badly in this block..
  			// for example, it would be possible to constantly enqueue the
  			// same files forever..
  			CloseableIterator<String> newNames = 
  				db.getNamesBetweenMarks(lastMarkPoint, currentMarkPoint);
  			while(newNames.hasNext()) {
  				String newName = newNames.next();
  				LOGGER.info("Queued " + newName + " for indexing.");
  				queue.enqueue(newName);
  				added++;
  			}
  			newNames.close();
  			lastMark.setLastMark(currentMarkPoint);
  		}
  		return added;
  	}
docs: Add new names to the IndexQueue.
  @return The number of items added to the queue.
  @throws IOException