Doctrine\ODM\MongoDB\DocumentManager::close PHP Method

    public function close()
    {
        $this->clear();
        $this->closed = true;
    }

 /**
  * @param Doctrine\ODM\MongoDB\DocumentManager $documentManager
  */
 private function _save(DocumentManager $documentManager)
 {
     try {
         if ($this->queue->count() <= 0) {
             $this->getLog()->debug('Queue contains no documents for processing.');
             return;
         }
         $this->getLog()->debug('Queue contains: ' . $this->queue->count() . ' documents.');
         foreach ($this->queue as $object) {
             $name = $object->getName();
             $_id = $object->getId();
             if (empty($_id)) {
                 $document = $object->getInstance();
                 $this->getLog()->info('Saving document: ' . $name . ' (' . $document->__toString() . ')');
                 //Debug::dump($document, 3);
                 $documentManager->persist($document);
                 $documentManager->flush();
                 $documentId = $document->getId();
                 if (!empty($name) && !empty($documentId)) {
                     $this->getLog()->info('Marking document: ' . $name . ' (' . get_class($document) . ') as persisted in cache with ID: ' . $documentId);
                     $this->markAsPersisted($name, $documentId, $document);
                 }
             }
         }
         $this->queue->clear();
         $this->getLog()->debug('Finished saving documents, queue now contains: ' . $this->queue->count() . ' documents.');
     } catch (\Exception $ex) {
         $this->getLog()->err('An error occurred while attempting to save one or more documents. ' . get_class($ex) . ' handled, with message: ' . $ex->getMessage());
         $documentManager->close();
         throw $ex;
     }
 }