RulesActionManager.php

<?php

namespace Drupal\rules\Core;

use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Plugin\CategorizingPluginManagerTrait;
use Drupal\Core\Plugin\Context\ContextAwarePluginManagerTrait;
use Drupal\Core\Plugin\DefaultPluginManager;
use Drupal\Core\Plugin\Discovery\ContainerDerivativeDiscoveryDecorator;
use Drupal\rules\Context\AnnotatedClassDiscovery;
use Drupal\rules\Core\Annotation\RulesAction;

/**
 * Provides a RulesAction plugin manager for the Rules actions API.
 *
 * @see \Drupal\rules\Core\Annotation\RulesAction
 * @see \Drupal\rules\Core\RulesActionInterface
 * @see \Drupal\rules\Core\RulesActionBase
 * @see plugin_api
 */
class RulesActionManager extends DefaultPluginManager implements RulesActionManagerInterface {
  use CategorizingPluginManagerTrait;
  use ContextAwarePluginManagerTrait;
  
  /**
   * 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/RulesAction', $namespaces, $module_handler, RulesActionInterface::class, RulesAction::class);
    $this->alterInfo('rules_action_info');
    $this->setCacheBackend($cache_backend, 'rules_action_info');
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getDiscovery() {
    if (!$this->discovery) {
      // Swap out the annotated class discovery used, so we can control the
      // annotation classes picked.
      $discovery = new AnnotatedClassDiscovery($this->subdir, $this->namespaces, $this->pluginDefinitionAnnotationName);
      $this->discovery = new ContainerDerivativeDiscoveryDecorator($discovery);
    }
    return $this->discovery;
  }

}