ProcessorInterface

class \Drupal\aggregator\Plugin\aggregator\processor\DefaultProcessor extends \Drupal\aggregator\Plugin\AggregatorPluginSettingsBase implements \Drupal\aggregator\Plugin\ProcessorInterface, \Drupal\Core\Plugin\ContainerFactoryPluginInterface uses \Drupal\Core\Form\ConfigFormBaseTrait
class \Drupal\aggregator_test\Plugin\aggregator\processor\TestProcessor extends \Drupal\aggregator\Plugin\AggregatorPluginSettingsBase implements \Drupal\aggregator\Plugin\ProcessorInterface, \Drupal\Core\Plugin\ContainerFactoryPluginInterface uses \Drupal\Core\Form\ConfigFormBaseTrait

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