private final ScheduledExecutorService scheduler;
    private final WitnessRpcClient rpcClient;

    // Witness service endpoint
    private static final String WITNESS_SERVICE_UUID = "ccd8c074-d0e5-4a40-92b4-d074faa6ba28";
    private static final int DEFAULT_WITNESS_PORT = 135; // RPC endpoint mapper

    /**
     * Interface for receiving witness notifications and registration events.
     */

        ERROR,
        /** Connection is being closed */
        CLOSING,
        /** Connection is closed */
        CLOSED
    }

    /** Remote endpoint address */
    protected final InetSocketAddress remoteAddress;
    /** Local endpoint address */
    protected final InetSocketAddress localAddress;
    /** Available send credits for flow control */
    protected final AtomicInteger sendCredits;

        @Test
        @DisplayName("Should throw DcerpcException for missing endpoint")
        void testConstructor_MissingEndpoint() {
            String urlWithoutEndpoint = "ncacn_np:server";
            assertThrows(DcerpcException.class, () -> new DcerpcPipeHandle(urlWithoutEndpoint, mockContext, false),
                    "Should throw DcerpcException for missing endpoint");
        }
    }

    @Nested

      // The cast is safe because of the hasLowerBound check.
      E endpoint = uncheckedCastNullableTToT(range.getLowerEndpoint());
      node = root.ceiling(comparator(), endpoint);
      if (node == null) {
        return null;
      }
      if (range.getLowerBoundType() == BoundType.OPEN
          && comparator().compare(endpoint, node.getElement()) == 0) {
        node = node.succ();
      }
    } else {

        // Create ResponseData with comprehensive data
        ResponseData responseData = new ResponseData();
        responseData.setUrl("https://api.example.com/endpoint");
        responseData.setHttpStatusCode(200);
        responseData.setMethod("POST");
        responseData.setMimeType("application/json");
        responseData.setSessionId("crawl-session-999");

  }

  private static <N, V> GraphConnections<N, V> connectionsOf(ValueGraph<N, V> graph, N node) {
    Function<N, V> successorNodeToValueFn =
        (N successorNode) ->
            // requireNonNull is safe because the endpoint pair comes from the graph.
            requireNonNull(graph.edgeValueOrDefault(node, successorNode, null));
    return graph.isDirected()
        ? DirectedGraphConnections.ofImmutable(

      // The cast is safe because of the hasLowerBound check.
      E endpoint = uncheckedCastNullableTToT(range.getLowerEndpoint());
      node = root.ceiling(comparator(), endpoint);
      if (node == null) {
        return null;
      }
      if (range.getLowerBoundType() == BoundType.OPEN
          && comparator().compare(endpoint, node.getElement()) == 0) {
        node = node.succ();
      }
    } else {

  }

  private static <N, V> GraphConnections<N, V> connectionsOf(ValueGraph<N, V> graph, N node) {
    Function<N, V> successorNodeToValueFn =
        (N successorNode) ->
            // requireNonNull is safe because the endpoint pair comes from the graph.
            requireNonNull(graph.edgeValueOrDefault(node, successorNode, null));
    return graph.isDirected()
        ? DirectedGraphConnections.ofImmutable(

        // For now, just test basic connectivity to RPC endpoint
        try (java.net.Socket socket = new java.net.Socket()) {
            socket.connect(new java.net.InetSocketAddress(serverAddress, WITNESS_RPC_PORT), WITNESS_RPC_TIMEOUT_MS);
        } catch (IOException e) {
            throw new IOException("Cannot connect to RPC endpoint at " + serverAddress.getHostAddress() + ":" + WITNESS_RPC_PORT, e);
        }
    }

                    list.add(map);
                }
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to access storage endpoint: {}", fessConfig.getStorageEndpoint(), e);
            }
        }

        list.addAll(fileList);
        return list;
    }

    /**
     * Extracts the file name from a full object path.