MigratePluginManagerInterface

class \Drupal\migrate\Plugin\MigrateDestinationPluginManager extends \Drupal\migrate\Plugin\MigratePluginManager
class \Drupal\migrate\Plugin\MigratePluginManager extends \Drupal\Core\Plugin\DefaultPluginManager implements \Drupal\migrate\Plugin\MigratePluginManagerInterface
class \Drupal\migrate\Plugin\MigrateSourcePluginManager extends \Drupal\migrate\Plugin\MigratePluginManager
class \Drupal\migrate_drupal\Plugin\MigrateFieldPluginManager extends \Drupal\migrate\Plugin\MigratePluginManager implements \Drupal\migrate_drupal\Plugin\MigrateFieldPluginManagerInterface