/**
     * Gets the request timeout in milliseconds.
     *
     * @return the timeout in milliseconds
     */
    protected abstract int getTimeout();

    /**
     * Gets the model name.
     *
     * @return the model name
     */
    protected abstract String getModel();

    /**
     * Gets the availability check interval in seconds.
     *

      Set<? extends E> set1, Set<? extends E> set2) {
    checkNotNull(set1, "set1");
    checkNotNull(set2, "set2");

    return new SetView<E>() {
      @Override
      public int size() {
        int size = set1.size();
        for (E e : set2) {
          if (!set1.contains(e)) {
            size++;
          }
        }
        return size;
      }

   */
  interface InternalEntry<K, V, E extends InternalEntry<K, V, E>> {
    /** Gets the next entry in the chain. */
    E getNext();

    /** Gets the entry's hash. */
    int getHash();

    /** Gets the key for this entry. */
    K getKey();

    /** Gets the value for the entry. */
    V getValue();
  }

  /*

   * equivalence relations, for example if {@code set1} is a {@link HashSet} and {@code set2} is a
   * {@link TreeSet} or the {@link Map#keySet} of an {@code IdentityHashMap}.
   */
  public static <E extends @Nullable Object> SetView<E> difference(Set<E> set1, Set<?> set2) {
    checkNotNull(set1, "set1");
    checkNotNull(set2, "set2");

    return new SetView<E>() {

            this.nonce = nonce;
            this.expiration = expiration;
        }

        /**
         * Gets the nonce value.
         * @return The nonce.
         */
        public String getNonce() {
            return nonce;
        }

        /**
         * Gets the expiration timestamp.
         * @return The expiration timestamp.
         */
        public long getExpiration() {

        final CrawlingConfigHelper crawlingConfigHelper = ComponentUtil.getCrawlingConfigHelper();
        return crawlingConfigHelper.get(responseData.getSessionId());
    }

    /**
     * Gets the XPath expression for extracting language information.
     *
     * @param fessConfig the Fess configuration
     * @param xpathConfigMap the XPath configuration map

        final String pLC = pageCacheMap.get(pathLC);
        if (pLC != null) {
            return pLC;
        }
        if (existsPage(pathLC)) {
            pageCacheMap.put(pathLC, pathLC);
            return pathLC;
        }

        final String pathL = getLocalizedPagePath(page, lang, null);
        final String pL = pageCacheMap.get(pathL);
        if (pL != null) {
            return pL;

     * The result field.
     */
    protected static final String RESULT_FIELD = "result";

    private static final String DOC_ID_FIELD = "doc_id";

    /**
     * The GET method.
     */
    protected static final String GET = "GET";

    /**
     * The POST method.
     */
    protected static final String POST = "POST";

    /**
     * The MIME type.
     */

   */
  interface InternalEntry<K, V, E extends InternalEntry<K, V, E>> {
    /** Gets the next entry in the chain. */
    E getNext();

    /** Gets the entry's hash. */
    int getHash();

    /** Gets the key for this entry. */
    K getKey();

    /** Gets the value for the entry. */
    V getValue();
  }

  /*

            this.requestedTime = requestedTime;
        }

        /**
         * Gets the search result documents.
         *
         * @return the list of documents
         */
        public List<Map<String, Object>> getDocuments() {
            return documents;
        }

        /**
         * Gets the query ID.
         *
         * @return the query ID
         */