MediaSourceManager.php

<?php

namespace Drupal\media;

use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Plugin\DefaultPluginManager;
use Drupal\media\Annotation\MediaSource;

/**
 * Manages media source plugins.
 */
class MediaSourceManager extends DefaultPluginManager {
    
    /**
     * Constructs a new MediaSourceManager.
     *
     * @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(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
        parent::__construct('Plugin/media/Source', $namespaces, $module_handler, MediaSourceInterface::class, MediaSource::class);
        $this->alterInfo('media_source_info');
        $this->setCacheBackend($cache_backend, 'media_source_plugins');
    }

}