* @since 20.0 (but the argument type was changed from {@code Object} to {@code N} in 31.0)
   */
  public final N adjacentNode(N node) {
    if (node.equals(nodeU)) {
      return nodeV;
    } else if (node.equals(nodeV)) {
      return nodeU;
    } else {
      throw new IllegalArgumentException("EndpointPair " + this + " does not contain node " + node);
    }
  }

  /**

   */
  @CanIgnoreReturnValue
  boolean putEdge(EndpointPair<N> endpoints);

  /**
   * Removes {@code node} if it is present; all edges incident to {@code node} will also be removed.
   *
   * @return {@code true} if the graph was modified as a result of this call
   */
  @CanIgnoreReturnValue
  boolean removeNode(N node);

  /**
   * Removes the edge connecting {@code nodeU} to {@code nodeV}, if it is present.
   *

    /**
     * Returns the first child node with the specified name.
     *
     * @param name the name of the child node to find
     * @return the first matching child node, or {@code null} if none found
     */
    @Nullable
    XmlNode child(String name);

    /**
     * Returns the input location information for this node, if available.
     * This can be useful for error reporting and debugging.

}

// HasLogListeners returns true if console log listeners are registered
// for this node or peers
func (sys *HTTPConsoleLoggerSys) HasLogListeners() bool {
	return sys != nil && sys.pubsub.Subscribers() > 0
}

// Subscribe starts console logging for this node.
func (sys *HTTPConsoleLoggerSys) Subscribe(subCh chan log.Info, doneCh <-chan struct{}, node string, last int, logKind madmin.LogMask, filter func(entry log.Info) bool) error {

     * Share deleted - share removal notification
     */
    SHARE_DELETE(5),

    /**
     * Cluster node unavailable - node down event
     */
    NODE_UNAVAILABLE(6),

    /**
     * Cluster node available - node up event
     */
    NODE_AVAILABLE(7);

    private final int value;

    /**
     * Creates a new WitnessEventType with the specified value.
     *
     * @param value the numeric event type value

		total:             "Total memory on the node",
		memUsed:           "Used memory on the node",
		memUsedPerc:       "Used memory percentage on the node",
		memFree:           "Free memory on the node",
		memShared:         "Shared memory on the node",
		memBuffers:        "Buffers memory on the node",
		memCache:          "Cache memory on the node",
		memAvailable:      "Available memory on the node",

      @Override
      public Set<N> adjacentNodes(N node) {
        return AbstractValueGraph.this.adjacentNodes(node);
      }

      @Override
      public Set<N> predecessors(N node) {
        return AbstractValueGraph.this.predecessors(node);
      }

      @Override
      public Set<N> successors(N node) {
        return AbstractValueGraph.this.successors(node);
      }

      @Override

  public N removeOutEdge(E edge) {
    N node = super.removeOutEdge(edge);
    Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
    if (adjacentNodes != null) {
      checkState(adjacentNodes.remove(node));
    }
    return node;
  }

  @Override
  public void addInEdge(E edge, N node, boolean isSelfLoop) {
    if (!isSelfLoop) {
      addOutEdge(edge, node);
    }
  }

  @Override

  }

  @Override
  public @Nullable V value(N node) {
    return adjacentNodeValues.get(node);
  }

  @Override
  public void removePredecessor(N node) {
    @SuppressWarnings("unused")
    V unused = removeSuccessor(node);
  }

  @Override
  public @Nullable V removeSuccessor(N node) {
    return adjacentNodeValues.remove(node);
  }

  @Override

     * @return the rpath
     */
    public final String getRpath() {
        return this.rpath;
    }

    /**
     * Gets the node name for this referral.
     *
     * @return the node
     */
    public final String getNode() {
        return this.node;
    }

    /**
     * Gets the special name for this referral.
     *
     * @return the specialName
     */