class AggregatorPluginManager

class AggregatorPluginManager extends DefaultPluginManager {
    
    /**
     * Constructs an AggregatorPluginManager object.
     *
     * @param string $type
     *   The plugin type, for example fetcher.
     * @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 $module_handler
     *   The module handler.
     */
    public function __construct($type, \Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
        $type_annotations = [
            'fetcher' => 'Drupal\\aggregator\\Annotation\\AggregatorFetcher',
            'parser' => 'Drupal\\aggregator\\Annotation\\AggregatorParser',
            'processor' => 'Drupal\\aggregator\\Annotation\\AggregatorProcessor',
        ];
        $plugin_interfaces = [
            'fetcher' => 'Drupal\\aggregator\\Plugin\\FetcherInterface',
            'parser' => 'Drupal\\aggregator\\Plugin\\ParserInterface',
            'processor' => 'Drupal\\aggregator\\Plugin\\ProcessorInterface',
        ];
        parent::__construct("Plugin/aggregator/{$type}", $namespaces, $module_handler, $plugin_interfaces[$type], $type_annotations[$type]);
        $this->alterInfo('aggregator_' . $type . '_info');
        $this->setCacheBackend($cache_backend, 'aggregator_' . $type . '_plugins');
    }

}