*
 * @since 4.0.0
 */
@Experimental
@Provider
public interface Log {
    /**
     * {@return true if the <b>debug</b> error level is enabled}
     */
    boolean isDebugEnabled();

    /**
     * Sends a message to the user in the <b>debug</b> error level.
     *
     * @param content the message to log
     */
    void debug(CharSequence content);

    /**

                    if (logger.isInfoEnabled()) {
                        logger.info("Excluded URL from failures: {}", urlValue);
                    }
                });
            }

            if (logger.isDebugEnabled()) {
                logger.debug("Crawling {}", urlsStr);
            }

            crawler.setBackground(true);
            crawler.setThreadPriority(crawlerPriority);

                if (scheduledJob.isRunning()) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("{} is running.", scheduledJob.getId());
                    }
                    counter.incrementAndGet();
                } else if (logger.isDebugEnabled()) {
                    logger.debug("{} is not running.", scheduledJob.getId());
                }
            }

            content = extractData.getContent();
            if (fessConfig.isCrawlerDocumentFileIgnoreEmptyContent() && StringUtil.isBlank(content)) {
                return null;
            }
            if (getLogger().isDebugEnabled()) {
                getLogger().debug("ExtractData: {}", extractData);
            }
            // meta
            extractData.getKeySet().stream().filter(k -> extractData.getValues(k) != null).forEach(key -> {

     * Initializes the dictionary manager after construction.
     * Sets up the relationship between this manager and all registered creators.
     */
    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        creatorList.forEach(creator -> {
            creator.setDictionaryManager(this);
        });
    }

    /**

        if (name == null || queryCommand == null) {
            throw new IllegalArgumentException("name or queryCommand is null.");
        }
        if (logger.isDebugEnabled()) {
            logger.debug("Loaded {}", name);
        }
        queryCommandMap.put(name, queryCommand);
    }

    /**
     * Adds a filter to the processing pipeline.

    private void reportPotentialLeak(ResourceHolder holder) {
        log.warn("Potential resource leak detected: {} ({}) - open for {} ms", holder.resourceId, holder.resourceType, holder.getAge());

        if (log.isDebugEnabled() && holder.allocationStackTrace != null) {
            StringBuilder sb = new StringBuilder("Allocation stack trace:\n");
            for (StackTraceElement element : holder.allocationStackTrace) {

                    @Override
                    public XPathAPI load(final String key) {
                        if (logger.isDebugEnabled()) {
                            logger.debug("created XPathAPI by {}", key);
                        }
                        return new XPathAPI();
                    }
                });
    }

                    ByteOrderMark.UTF_32BE, ByteOrderMark.UTF_32LE, BOM_UTF_7);
            if (bomIn.hasBOM()) {
                if (logger.isDebugEnabled()) {
                    logger.debug("BOM: {}", bomIn.getBOMCharsetName());
                }
                return bomIn.getBOMCharsetName();
            }
            final int c = bomIn.read(b);

                        throw new UnknownHostException(hostname);
                    }
                    final UniAddress[] addrs = wrapInetAddresses(InetAddress.getAllByName(hostname));
                    if (log.isDebugEnabled()) {
                        log.debug("Resolved '{}' to {} using DNS", hostname, Arrays.toString(addrs));
                    }
                    return addrs; // Success
                default: