- * <p>This class is not thread safe, the callers are responsible for guarding against conflicting access.
- * Time is measured in ticks (nanos), methods never look at current time, relying on {@code now} argument instead.
- * This means the sequence of {$code now} argument values is expected to be non-decreasing.
+ * <p>This class is to be used by single frontend. This class is not thread safe,
+ * the frontend is responsible for guarding against conflicting access.
+ * Time is measured in ticks (nanoseconds), methods never look at current time,
+ * relying on {@code now} argument where appropriate.
+ * This means the sequence of {@code now} argument values is expected to be non-decreasing.