try {
            if (socketChannel != null) {
                socketChannel.close();
            }
        } finally {
            state = RdmaConnectionState.CLOSED;
        }

        log.debug("TCP RDMA connection closed");
    }

    /**
     * Do not instantiate.
     */
    protected PropertiesUtil() {
    }

    /**
     * Wraps exception handling for {@link Properties#load(InputStream)}.
     * <p>
     * The input stream is not closed.
     * </p>
     *
     * @param props the property set (must not be {@literal null})
     * @param in the input stream (must not be {@literal null})
     */

                clientChallenge = null;
            }
            closed = true;
        }
    }

    /**
     * Check if this authenticator has been closed
     *
     * @return true if closed, false otherwise
     */
    public boolean isClosed() {
        return closed;
    }

    private void checkNotClosed() {
        if (closed) {

import java.util.stream.Stream;

/**
 * A destination to which characters can be written, such as a text file. Unlike a {@link Writer}, a
 * {@code CharSink} is not an open, stateful stream that can be written to and closed. Instead, it
 * is an immutable <i>supplier</i> of {@code Writer} instances.
 *
 * <p>{@code CharSink} provides two kinds of methods:
 *
 * <ul>

      return (lowerEndpoint.compareTo(upperEndpoint) <= 0)
          ? ContiguousSet.create(Range.closed(lowerEndpoint, upperEndpoint), domain)
          : new EmptyContiguousSet<C>(domain);
    }
  }

  @Override
  public Range<C> range() {
    return range(CLOSED, CLOSED);
  }

  @Override
  public Range<C> range(BoundType lowerBoundType, BoundType upperBoundType) {

    /**
     * Constructs a close response
     *
     * @param config
     *            The configuration to use
     * @param fileId
     *            The file ID that was closed
     * @param fileName
     *            The name of the file that was closed
     */
    public Smb2CloseResponse(final Configuration config, final byte[] fileId, final String fileName) {
        super(config);
        this.fileId = fileId;

        ESTABLISHED,
        /** Connection encountered an error */
        ERROR,
        /** Connection is being closed */
        CLOSING,
        /** Connection is closed */
        CLOSED
    }

    /** Remote endpoint address */
    protected final InetSocketAddress remoteAddress;
    /** Local endpoint address */
    protected final InetSocketAddress localAddress;

        assertTrue(iterator.hasNext());
        assertSame(resource, iterator.next());
        assertFalse(iterator.hasNext());
        assertNull(iterator.next());

        // Without filter, resource should not be closed
        verify(resource, never()).close();
    }

    @Test
    @DisplayName("Iterator with accepting filter")
    void iteratorWithAcceptingFilter() throws Exception {
        // Setup

        }

        /**
         * Verifies that the isOpen method returns false for a closed handle.
         */
        @Test
        public void testIsOpen_ReturnsFalseWhenClosed() {
            when(smbPipeHandle.isOpen()).thenReturn(false);
            assertFalse(smbPipeHandle.isOpen(), "isOpen() should return false when the handle is closed.");
        }
    }

    /**

        assertTrue(ex1.getMessage().contains("Already closed"));
        CIFSException ex2 = assertThrows(CIFSException.class, handle::getOutput, "getOutput after close must throw");
        assertTrue(ex2.getMessage().contains("Already closed"));
    }

    @Test
    @DisplayName("ensureOpen opens SMB2 via UNC path and marks open")