code: protected Map<String, CsvFile> getCsvFiles() {
  		if (csvFiles == null) {
  			String fileName = null;
  			csvFiles = Maps.newHashMap();
  
  			Set<String> keys = configuration.keySet();
  			String prefix = "dataSource." + getName() + ".";
  			for (String key : keys) {
  				if (key.startsWith(prefix)) {
  					String dataKey = key.substring(key.indexOf(prefix) + prefix.length());
  					fileName = configuration.get(key);
  					if (StringUtils.isEmpty(fileName)) {
  						// no CSV file configured
  						continue;
  					}
  					log.debug("Loading file " + fileName + " for dataKey=" + dataKey);
  					CsvFile csvFile = new CsvFile(fileName);
  					csvFiles.put(dataKey, csvFile);
  				}
  			}
  			if (csvFiles.isEmpty()) {
  				log.warn("CsvDataSource can only be used when CSV files are correctly configured");
  			}
  		}
  		return csvFiles;
  	}
docs: CSV files are not loaded here, this is done on-access (lazy loading).