code: function (data) {
          data = data || '';
          this._sendAndClose(protocol.PACKET_TYPES.WORK_COMPLETE, [this.handle, data.toString()]);
      }
docs: Sends a notification to the server (and any listening clients) that the job completed successfully.
  
  @method
  @memberof Job
  @param {string|Buffer} data to be sent to client
  @returns {void} nothing