code: @Override
      public boolean isEmpty() {
          try {
              lockAllSegments();
              for (LinkedHashMapSegment<K, V> seg : segments) {
                  if (!seg.isEmpty())
                      return false;
              }
              return true;
          } finally {
              unlockAllSegments();
          }
      }
docs: Returns <tt>true</tt>, if the map doesn't contain any entry.
  
  @return <tt>true</tt> if this map contains no key-value mappings.