log_(message) {
    const args =
        /**
         * @type {{level: number, message: string,
         *           name: string, exception: Object}}
         */
        (message);
    const level = Level.getPredefinedLevelByValue(args['level']);
    if (level) {
      const msg = '[' + this.channelName_ + '] ' + args['message'];
      log.log(log.getLogger(args['name']), level, msg, args['exception']);
    }
  }
Handles logging messages from the client.
@param {!Object|string} message
    The logging information from the client.
@private