Drupal 8 Module Development - Second Edition

Creating the batch

Inside the JsonImporter::import() method, once we get our hands on the $products array, let's replace the loop with the following:

$batch_builder = (new BatchBuilder()) 
  ->setTitle($this->t('Importing products')) 
  ->setFinishCallback([$this, 'importProductsFinished']); 
 
$batch_builder->addOperation([$this, 'clearMissing'], [$products]); 
$batch_builder->addOperation([$this, 'importProducts'], [$products]); 
batch_set($batch_builder->toArray());  

And the new use statement at the top:

use Drupal\Core\Batch\BatchBuilder;  

Creating a batch involves a number of steps, the first one being the creation of a batch definition, which is nothing more than an array with some data. Before version 8.6 of Drupal, the batch definition was created ...