xioutil.SafeClose(c.done)
			c.done = nil
		}
	}
	return n, err
}

func (c *closeNotifier) Close() error {
	if c.done != nil {
		xioutil.SafeClose(c.done)
		c.done = nil
	}
	return c.rc.Close()
}

// keepHTTPReqResponseAlive can be used to avoid timeouts with long storage
// operations, such as bitrot verification or data usage scanning.
// Every 10 seconds a space character is sent.

   * {@link ByteStreams} method returns a singleton stream whose {@code close} method has no effect,
   * while the {@link OutputStream} method returns a new instance whose {@code write} methods throw
   * if called on a closed stream.
   *
   * @since 14.0 (since 1.0 as com.google.common.io.NullOutputStream)
   */
  public static OutputStream nullOutputStream() {

In most setups this will keep the scanner slow enough to not impact overall system performance. Setting the `delay` key to a *lower* value will make the scanner faster and setting it to 0 will make the scanner run at full speed (not recommended in production). Setting it to a higher value will make the scanner slower, consuming less resources with the trade off of not collecting metrics for operations like healing and disk usage as fast.

```

    of unacknowledged data per stream and no per-connection limit.

 *  Fix: Don't close a `Deflater` while we're still using it to compress a web socket message. We
    had a severe bug where web sockets were closed on the wrong thread, which caused
    `NullPointerException` crashes in `Deflater`.

     */
    @Test
    void testClose_multipleTimes() {
        doNothing().when(smbTree).close();

        smbTree.close();
        smbTree.close();
        smbTree.close();

        verify(smbTree, times(3)).close();
    }

    /**
     * Test for close() method throwing exception.
     * Verifies behavior when close throws an exception.
     */
    @Test
    void testClose_throwsException() {

    void testReadWriteMethodsReturnValues() {
        SmbComClose close = new SmbComClose(10, 5000L);
        assertEquals(0, close.readParameterWordsWireFormat(new byte[10], 0));
        assertEquals(0, close.readBytesWireFormat(new byte[10], 0));
        assertEquals(0, close.writeBytesWireFormat(new byte[10], 0));
        assertEquals(6, close.writeParameterWordsWireFormat(new byte[10], 0));
    }

    /**

						return true, nil
					}
					return false, err
				}
				err = d.deserialize(r)
				r.Close()
				return err != nil, nil
			case InsufficientReadQuorum, StorageErr:
				return true, nil
			}
			return false, err
		}
		err = d.deserialize(r)
		r.Close()
		return err != nil, nil
	}

	// Caches are read+written without locks,
	retries := 0
	for retries < 5 {

        cos.write(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }); // exceeds threshold

        // ## Act & Assert ##
        // Multiple close() calls should be safe
        cos.close();
        cos.close();
        cos.close();
    }

        doThrow(new CIFSException("Failed to close")).when(smbFileHandle).close(lastWriteTime);
        assertThrows(CIFSException.class, () -> smbFileHandle.close(lastWriteTime),
                "close(long) should throw CIFSException when closing fails.");
        verify(smbFileHandle, times(1)).close(lastWriteTime);
    }

    /**
     * Test close() successfully.
     *
     * @throws CIFSException
     */

        }
        if (httpClient != null) {
            try {
                httpClient.close();
                if (logger.isDebugEnabled()) {
                    logger.debug("HTTP client closed successfully");
                }
            } catch (final IOException e) {
                logger.warn("Failed to close HTTP client", e);
            }
            httpClient = null;