code: public Node nextAvailableNode() {
          if (!isInit) {
              init();
          }
          currentNodeIndex++;
          if (currentNodeIndex >= allNodes.length) {
              currentNodeIndex = 0;
          }
          return currentNode();
      }
docs: <p>Returns the next available <code>Node</code> for uuid generation.</p>
  
  @return the next available <code>Node</code> for uuid generation.