@Override
		public String toRecordString() {
			StringBuilder sb = new StringBuilder();
			sb.append("null").append(",").append("null").append(",");
			sb.append("null").append(",").append("null").append(",");
			sb.append("null").append(",").append("null");
			if (bandWidth != null) {
				sb.append(",").append("null").append(",").append("null");
			}
			if (customValues != null) {
				int valueCount = StringUtils.countMatches(customValues, ",") + 1;
				for (int i = 0; i < valueCount; i++) {
					sb.append(",").append("null");
				}
			}
			return sb.toString();
		}
Return the empty record string.

@return null filled record string.
@see #toRecordString()
ngrinder-core/src/main/java/org/ngrinder/monitor/share/domain/SystemInfo.java