code: function (methodName, params, execOptions) {
                  var requestId = this._getRequestId(methodName, params);
                  var promise = this._getRequestPromise(requestId);
  
                  if (!promise) {
                      this._addToBatch(methodName, params);
                      promise = this._createPromise(requestId);
                      this._run(execOptions);
                  }
  
                  return promise;
              }
docs: Executes method with a little delay, adding it to batch.
  
  @param {String} methodName Method name.
  @param {Object} params Data should be sent to the method.
  @param {Object} execOptions Exec-specific options.
  @returns {vow.Promise}