*
 * @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);

    /**

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

    }

    @Override
    public QueryBuilder execute(final QueryContext context, final Query query, final float boost) {
        if (query instanceof final TermQuery termQuery) {
            if (logger.isDebugEnabled()) {
                logger.debug("{}:{}", query, boost);
            }
            return convertTermQuery(context, termQuery, boost);
        }

                    writer.write(content);
                    writer.write('\n');
                } catch (final Exception e) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Exception in an internal extractor.", e);
                    }
                }
            }
        }
    }

                .get(stream -> stream.filter(StringUtil::isNotBlank).map(s -> s.trim() + ":").toArray(n -> new String[n]));

        loadProtocols("org.codelibs.fess.net.protocol");

        if (logger.isDebugEnabled()) {
            logger.debug("web protocols: {}", Arrays.toString(webProtocols));
            logger.debug("file protocols: {}", Arrays.toString(fileProtocols));
        }
    }

                if (response.isAcknowledged()) {
                    logger.info("Created {} alias for {}", aliasName, indexName);
                    return true;
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to create {} alias for {}", aliasName, indexName);
                }
            }
        } catch (final ResourceNotFoundRuntimeException e) {
            // ignore

                        return new StatsObject();
                    }
                });
    }

    @PreDestroy
    public void destroy() {
        if (logger.isDebugEnabled()) {
            logger.debug("cache stats: {}", statsCache.stats());
        }
        statsCache.asMap().entrySet().stream().forEach(e -> {
            final StatsObject data = e.getValue();

    protected PopularWordHelper popularWordHelper = null;

    protected long searchStoreInterval = 1; // min

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        fessConfig = ComponentUtil.getFessConfig();
        split(fessConfig.getSuggestFieldContents(), ",")

                try {
                    final String line = br.readLine();
                    if (line == null) {
                        break;
                    }
                    if (logger.isDebugEnabled()) {
                        logger.debug(line);
                    }
                    list.add(line);
                    if (list.size() > maxLineBuffer) {
                        list.remove(0);

        try {
            officeManager.start();
        } catch (final OfficeException e) {
            throw new CrawlerSystemException("Failed to start officeManager.", e);
        }
        if (logger.isDebugEnabled()) {
            logger.debug(officeManager.getClass().getSimpleName() + " is started.");
        }
    }

    @PreDestroy
    public void destroy() {
        try {
            officeManager.stop();