/**
  * @param $dataDirection
  * @param null|string $handlerType
  * @param null|array $metadata
  * @return MessageHandler
  */
 private function getMessageHandler($dataDirection, $handlerType = null, array $metadata = null)
 {
     if (!is_null($handlerType)) {
         $handlerType = MessageHandler\HandlerType::fromString($handlerType);
     } else {
         $handlerType = MessageHandler\HandlerType::connector();
     }
     if (!is_null($metadata)) {
         $metadata = ProcessingMetadata::fromArray($metadata);
     } else {
         $metadata = ProcessingMetadata::noData();
     }
     return MessageHandler::fromDefinition(MessageHandlerId::generate(), 'Article Export', NodeName::defaultName(), $handlerType, MessageHandler\DataDirection::fromString($dataDirection), MessageHandler\ProcessingTypes::support([ArticleCollection::prototype(), Article::prototype()]), $metadata, 'sqlconnector-pm-metadata', 'glyphicon-hdd', 'glyphicon', Article::prototype(), MessageHandler\ProcessingId::fromString('sqlconnector:::example'));
 }
 /**
  * @return DataDirection
  */
 public function dataDirection()
 {
     return DataDirection::fromString($this->payload['data_direction']);
 }
 /**
  * @return DataDirection
  */
 public function dataDirection()
 {
     if (is_null($this->dataDirection)) {
         $this->dataDirection = DataDirection::fromString($this->payload['data_direction']);
     }
     return $this->dataDirection;
 }