HelpSectionManager.php

<?php

namespace Drupal\help;

use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Plugin\DefaultPluginManager;

/**
 * Manages help page section plugins.
 *
 * @see \Drupal\help\HelpSectionPluginInterface
 * @see \Drupal\help\Plugin\HelpSection\HelpSectionPluginBase
 * @see \Drupal\help\Annotation\HelpSection
 * @see hook_help_section_info_alter()
 */
class HelpSectionManager extends DefaultPluginManager {
    
    /**
     * Constructs a new HelpSectionManager.
     *
     * @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 for the alter hook.
     */
    public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
        parent::__construct('Plugin/HelpSection', $namespaces, $module_handler, 'Drupal\\help\\HelpSectionPluginInterface', 'Drupal\\help\\Annotation\\HelpSection');
        $this->alterInfo('help_section_info');
        $this->setCacheBackend($cache_backend, 'help_section_plugins');
    }

}