* Provides functionality to retrieve popular words based on search parameters
 * and manages caching for improved performance.
 */
public class PopularWordHelper {
    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(PopularWordHelper.class);

    /** Character used to separate cache key components */
    protected static final char CACHE_KEY_SPLITTER = '\n';

import com.google.common.cache.CacheBuilder;

public class PopularWordHelperTest extends UnitFessTestCase {

    public PopularWordHelper popularWordHelper;

    @Override
    public void setUp() throws Exception {
        super.setUp();
        popularWordHelper = new PopularWordHelper() {
            @Override
            public void init() {
                fessConfig = new FessConfig.SimpleImpl() {

    @Resource
    protected OsddHelper osddHelper;

    /** Helper for managing popular search words and suggestions. */
    @Resource
    protected PopularWordHelper popularWordHelper;

    /** The HTTP servlet request object for the current request. */
    @Resource
    protected HttpServletRequest request;

    /** Flag indicating whether search logging is enabled. */

    /** The list of content field names. */
    protected List<String> contentFieldList;

    /** The popular word helper for handling popular words. */
    protected PopularWordHelper popularWordHelper = null;

    /** The interval for storing search logs. */
    protected long searchStoreInterval = 1; // min

    /**
     * Initializes the SuggestHelper.

        }
        final String[] fields = request.getParameterValues("field");

        final PopularWordHelper popularWordHelper = ComponentUtil.getPopularWordHelper();

        final StringBuilder buf = new StringBuilder(255);
        try {
            final List<String> popularWordList =
                    popularWordHelper.getWordList(SearchRequestType.JSON, seed, tags, null, fields, StringUtil.EMPTY_STRINGS);

            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }

    // Mock PopularWordHelper implementation
    private class MockPopularWordHelper extends PopularWordHelper {
        private boolean cacheCleared = false;

        @Override
        public void clearCache() {
            cacheCleared = true;
        }