class ActionManager

class ActionManager extends DefaultPluginManager implements CategorizingPluginManagerInterface {
  use CategorizingPluginManagerTrait;

  /**
   * Constructs a new class instance.
   *
   * @param \Traversable $namespaces
   *   An object that implements \Traversable which contains the root paths
   *   keyed by the corresponding namespace to look for plugin implementations.
   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
   *   Cache backend instance to use.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler to invoke the alter hook with.
   */
  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
    parent::__construct('Plugin/Action', $namespaces, $module_handler, 'Drupal\\Core\\Action\\ActionInterface', 'Drupal\\Core\\Annotation\\Action');
    $this
      ->alterInfo('action_info');
    $this
      ->setCacheBackend($cache_backend, 'action_info');
  }

  /**
   * Gets the plugin definitions for this entity type.
   *
   * @param string $type
   *   The entity type name.
   *
   * @return array
   *   An array of plugin definitions for this entity type.
   */
  public function getDefinitionsByType($type) {
    return array_filter($this
      ->getDefinitions(), function ($definition) use ($type) {
      return $definition['type'] === $type;
    });
  }

}