ChannelStatistics stats = channelStats.computeIfAbsent(channelId, 
            k -> new ChannelStatistics());
            
        stats.operations.incrementAndGet();
        stats.latencyTotal.addAndGet(latency);
        
        if (success) {
            stats.bytesReceived.addAndGet(bytes);
        } else {
            stats.errors.incrementAndGet();
        }
    }
    

     * Gets the current boost expression.
     *
     * @return the boost expression string
     */
    public String getBoostExpression() {
        return boostExpression;
    }

    /**
     * Sets the boost expression used to calculate boost values.
     *
     * @param expression the boost expression string
     */
    public void setBoostExpression(final String expression) {
        boostExpression = expression;

     *
     * @return An <code>int</code> containing the flags in use for this
     * message.
     */
    public int getFlags() {
        return flags;
    }

    /**
     * Sets the flags for this message.
     *
     * @param flags The flags for this message.
     */
    public void setFlags(final int flags) {
        this.flags = flags;
    }

    /**

    /**
     * Returns the parent CrawlerClientFactory.
     * @return The parent CrawlerClientFactory.
     */
    public CrawlerClientFactory getParent() {
        return factory;
    }

    /**
     * Sets the initialization parameter map for this wrapper.
     * These parameters will be applied to the wrapped factory upon calling initParameterMap().
     * @param params The map of parameters.
     */
    @Override

        assertFalse(queryFieldConfig.isFacetField("category"));
    }

    /**
     * Test that init() creates Sets when arrays are initialized.
     */
    @Test
    public void test_init_createsSets() {
        queryFieldConfig.init();

        // All Sets should be created during init
        assertNotNull(queryFieldConfig.searchFieldSet);
        assertNotNull(queryFieldConfig.facetFieldSet);

    }

    /**
     * Sets the maximum buffer size for this transaction
     * @param maxBufferSize
     *            the maxBufferSize to set
     */
    public final void setMaxBufferSize(final int maxBufferSize) {
        this.maxBufferSize = maxBufferSize;
    }

    /**
     * Sets the maximum data count for this transaction
     * @param maxDataCount

     *
     * @return whether the server supports DFS
     */
    boolean isDFSSupported();

    /**
     * Sets up the given request with negotiated parameters.
     *
     * @param request the request to configure
     */
    void setupRequest(CommonServerMessageBlock request);

    /**
     * Sets up the given response with negotiated parameters.
     *
     * @param resp the response to configure
     */

func loadClusterNotificationMetrics(_ context.Context, m MetricValues, _ *metricsCache) error {
	if globalEventNotifier == nil {
		return nil
	}

	nstats := globalEventNotifier.targetList.Stats()
	m.Set(notificationCurrentSendInProgress, float64(nstats.CurrentSendCalls))
	m.Set(notificationEventsErrorsTotal, float64(nstats.EventsErrorsTotal))
	m.Set(notificationEventsSentTotal, float64(nstats.TotalEvents))

	}
	info.Used = info.Total - info.Free
	return info, nil
}

// GetDriveStats returns IO stats of the drive by its major:minor
func GetDriveStats(major, minor uint32) (iostats IOStats, err error) {
	return IOStats{}, errors.New("operation unsupported")

    }

    // ========== Thread Safety Tests ==========

    /**
     * Test that the volatile alive field is visible across threads.
     * One thread sets alive to false, other threads should see the change immediately.
     */
    @Test
    public void test_aliveField_volatileVisibility() throws Exception {
        // Ensure alive starts as true