AnnotatedClassDiscoveryAutomatedProviders example

  public function __construct($type, \Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
    parent::__construct($type, $namespaces, $cache_backend, $module_handler, 'Drupal\migrate\Annotation\MigrateSource');
  }

  /** * {@inheritdoc} */
  protected function getDiscovery() {
    if (!$this->discovery) {
      $discovery = new AnnotatedClassDiscoveryAutomatedProviders($this->subdir, $this->namespaces, $this->pluginDefinitionAnnotationName, $this->additionalAnnotationNamespaces);
      $this->discovery = new ContainerDerivativeDiscoveryDecorator($discovery);
    }
    return $this->discovery;
  }

  /** * Finds plugin definitions. * * @return array * List of definitions to store in cache. * * @todo This is a temporary solution to the fact that migration source * plugins have more than one provider. This functionality will be moved to * core in https://www.drupal.org/node/2786355. */