docs: function (isResponse, request, cb) {
                  if (!this._filters) {
                      this.$callback(cb);
                      return;
                  }
                  var args = {
                      isResponse : isResponse,
                      request : request,
                      cb : cb,
                      filters : this._filters,
                      nbFilters : this._filters.length
                      // store the number of filters so that we do not call filters which were added after the call
                      // to _callFilters
                  };
                  if (this._filtersToBeLoaded > 0
                          && (request.sender == null || request.sender.classpath != "aria.core.FileLoader")) {
                      this._loadMissingFilters({
                          fn : this._continueCallingFilters,
                          args : args,
                          scope : this
                      });
                  } else {
                      this._continueCallingFilters(null, args);
                  }
              }