authenticator.updateMemberOf(this);
                    permissions = null;
                    if (logger.isDebugEnabled()) {
                        logger.debug("Token refreshed successfully via silent authentication");
                    }
                    return true;
                }
            } catch (final Exception e) {
                if (logger.isDebugEnabled()) {

   */
  public abstract V load(K key) throws Exception;

  /**
   * Computes or retrieves a replacement value corresponding to an already-cached {@code key}. This
   * method is called when an existing cache entry is refreshed by {@link
   * CacheBuilder#refreshAfterWrite}, or through a call to {@link LoadingCache#refresh}.
   *
   * <p>This implementation synchronously delegates to {@link #load}. It is recommended that it be

     */
    protected Map<String, DataStore> dataStoreMap = new LinkedHashMap<>();

    /**
     * Cached array of available data store names discovered from plugin JAR files.
     * This cache is refreshed periodically based on the lastLoadedTime.
     */
    protected volatile String[] dataStoreNames = StringUtil.EMPTY_STRINGS;

    /**
     * Timestamp of the last time data store names were loaded from plugin files.

   */
  public abstract V load(K key) throws Exception;

  /**
   * Computes or retrieves a replacement value corresponding to an already-cached {@code key}. This
   * method is called when an existing cache entry is refreshed by {@link
   * CacheBuilder#refreshAfterWrite}, or through a call to {@link LoadingCache#refresh}.
   *
   * <p>This implementation synchronously delegates to {@link #load}. It is recommended that it be

    assertThat(stats.loadExceptionCount()).isEqualTo(0);
    assertThat(stats.hitCount()).isEqualTo(1);

    ticker.advance(1, MILLISECONDS);
    assertThat(cache.getUnchecked(key)).isSameInstanceAs(one);
    // refreshed
    stats = cache.stats();
    assertThat(stats.missCount()).isEqualTo(1);
    assertThat(stats.loadSuccessCount()).isEqualTo(1);
    assertThat(stats.loadExceptionCount()).isEqualTo(1);

        }
    }

    /**
     * Test cache refresh mechanism with concurrent access.
     * Verifies that cache is refreshed correctly even with concurrent readers.
     */
    @Test
    public void test_cacheRefresh_withConcurrentReads() throws Exception {
        final int[] loadCount = { 0 };

        fessLoginAssist.getSavedUserBean().ifPresent(u -> {
            final boolean result = u.getFessUser().refresh();
            if (logger.isDebugEnabled()) {
                logger.debug("Refreshed user info: result={}", result);
            }
        });
        return viewHelper.getActionHook().godHandPrologue(runtime, super::godHandPrologue);
    }

    /**

    assertThat(stats.loadExceptionCount()).isEqualTo(0);
    assertThat(stats.hitCount()).isEqualTo(1);

    ticker.advance(1, MILLISECONDS);
    assertThat(cache.getUnchecked(key)).isSameInstanceAs(one);
    // refreshed
    stats = cache.stats();
    assertThat(stats.missCount()).isEqualTo(1);
    assertThat(stats.loadSuccessCount()).isEqualTo(1);
    assertThat(stats.loadExceptionCount()).isEqualTo(1);

        return designJspFileNameMap.entrySet().stream().map(e -> new Pair<>(e.getKey(), e.getValue())).toArray(n -> new Pair[n]);
    }

    /**
     * Refreshes the design JSP files for all virtual hosts.
     *
     * @return A list of paths to the refreshed files.
     */
    public List<Path> refreshDesignJspFiles() {
        final List<Path> fileList = new ArrayList<>();

     * Returns the newly refreshed value associated with {@code key} if it was refreshed inline, or
     * {@code null} if another thread is performing the refresh or if an error occurs during
     * refresh.
     */
    @CanIgnoreReturnValue
    @Nullable V refresh(K key, int hash, CacheLoader<? super K, V> loader, boolean checkTime) {
      LoadingValueReference<K, V> loadingValueReference =