final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (clickLogQueue.size() > fessConfig.getLoggingClickMaxQueueSizeAsInteger()) {
            logger.warn("Click log queue size exceeded: queueSize={}, limit={}. Skipped.", clickLogQueue.size(),
                    fessConfig.getLoggingClickMaxQueueSizeAsInteger());
            return;
        }
        clickLogQueue.add(clickLog);
    }

    /**

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getLoggingClickMaxQueueSizeAsInteger();

    /**
     * Get the value for the key 'form.admin.max.input.size'. <br>
     * The value is, e.g. 10000 <br>
     * comment: Maximum input size for admin forms.