/**
  * {@inheritdoc}
  */
 public function read()
 {
     $this->documentManager->clear();
     if (!$this->executed) {
         $this->executed = true;
         if (!is_object($this->channel)) {
             $this->channel = $this->channelManager->getChannelByCode($this->channel);
         }
         if ($this->missingCompleteness) {
             $this->completenessManager->generateMissingForChannel($this->channel);
         }
         $this->query = $this->repository->buildByChannelAndCompleteness($this->channel)->getQuery();
         $this->products = $this->getQuery()->execute();
         // MongoDB Cursor are not positioned on first element (whereas ArrayIterator is)
         // as long as getNext() hasn't be called
         $this->products->getNext();
     }
     $result = $this->products->current();
     if ($result) {
         $this->metricConverter->convert($result, $this->channel);
         $this->stepExecution->incrementSummaryInfo('read');
         $this->products->next();
     }
     return $result;
 }