/** {@inheritDoc} */
  @Override
  public Map<K, V> peekAll(
      @Nullable Collection<? extends K> keys,
      @Nullable GridPredicate<? super GridCacheEntry<K, V>>[] filter) {
    if (keys == null || keys.isEmpty()) return emptyMap();

    final Collection<K> skipped = new GridLeanSet<K>();

    final Map<K, V> map = peekAll0(keys, filter, skipped);

    if (map.size() + skipped.size() != keys.size()) {
      map.putAll(
          dht.peekAll(
              F.view(
                  keys,
                  new P1<K>() {
                    @Override
                    public boolean apply(K k) {
                      return !map.containsKey(k) && !skipped.contains(k);
                    }
                  }),
              filter));
    }

    return map;
  }
  /** {@inheritDoc} */
  @Override
  public Map<K, V> peekAll(
      @Nullable Collection<? extends K> keys, @Nullable Collection<GridCachePeekMode> modes)
      throws GridException {
    if (keys == null || keys.isEmpty()) return emptyMap();

    final Collection<K> skipped = new GridLeanSet<K>();

    final Map<K, V> map =
        !modes.contains(PARTITIONED_ONLY)
            ? peekAll0(keys, modes, ctx.tm().localTxx(), skipped)
            : new GridLeanMap<K, V>(0);

    if (map.size() != keys.size() && !modes.contains(NEAR_ONLY)) {
      map.putAll(
          dht.peekAll(
              F.view(
                  keys,
                  new P1<K>() {
                    @Override
                    public boolean apply(K k) {
                      return !map.containsKey(k) && !skipped.contains(k);
                    }
                  }),
              modes));
    }

    return map;
  }
  /**
   * Parses HTTP parameters in an appropriate format and return back map of values to predefined
   * list of names.
   *
   * @param req Request.
   * @return Map of parsed parameters.
   */
  @SuppressWarnings({"unchecked"})
  private Map<String, Object> parameters(ServletRequest req) {
    Map<String, String[]> params = req.getParameterMap();

    if (F.isEmpty(params)) return Collections.emptyMap();

    Map<String, Object> map = U.newHashMap(params.size());

    for (Map.Entry<String, String[]> entry : params.entrySet())
      map.put(entry.getKey(), parameter(entry.getValue()));

    return map;
  }