* expired from the head of the list.
   */

  /** Returns the time that this entry was last written, in ns. */
  @SuppressWarnings("GoodTime")
  long getWriteTime();

  /** Sets the entry write time in ns. */
  @SuppressWarnings("GoodTime") // b/122668874
  void setWriteTime(long time);

  /** Returns the next entry in the write queue. */

      for (ReferenceEntry<K, V> e : segment.recencyQueue) {
        long accessTime = e.getAccessTime();
        assertTrue(accessTime >= lastAccessTime);
        lastAccessTime = accessTime;
        long writeTime = e.getWriteTime();
        assertTrue(writeTime >= lastWriteTime);
        lastWriteTime = writeTime;
      }

      lastAccessTime = 0;
      lastWriteTime = 0;