nl_tokens: @class Track
pl_tokens: function Track ( app , logger ) { /**
       * @public
       * @memberOf {Track}
       * @property
       * @type {String}
       * */ this . <mask> = this . _createId ( ) ; /**
       * TODO Deprecate?
       *
       * @public
       * @memberOf {Track}
       * @property
       * @type {Logger}
       * */ this . logger = logger ; /**
       * @public
       * @memberOf {Track}
       * @property
       * @type {Object}
       * */ this . params = { } ; /**
       * @protected
       * @memberOf {Track}
       * @property
       * @type {Core}
       * */ this . _app = app ; /**
       * @public
       * @memberOf {Track}
       * @property
       * @type {Object}
       * */ this . calls = { } ; /**
       * @protected
       * @memberOf {Track}
       * @property
       * @type {Boolean}
       * */ this . _isFlushed = false ; }