ajax_dashboard-8.x-2.x-dev/src/AJAXDashboardManager.php

<?php

namespace Drupal\ajax_dashboard;

use Drupal\Component\Plugin\Exception\PluginException;
use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Plugin\DefaultPluginManager;
use Drupal\Core\Plugin\Discovery\ContainerDerivativeDiscoveryDecorator;
use Drupal\Core\Plugin\Discovery\YamlDiscovery;

/**
 * Class AJAXDashboardManager.
 *
 * @package Drupal\ajax_dashboard
 */
class AJAXDashboardManager extends DefaultPluginManager implements AJAXDashboardManagerInterface {

  /**
   * Provides default values for all ajax_dashboard plugins.
   *
   * @var array
   */
  protected $defaults = [
    'id' => '',
    'label' => '',
  ];

  /**
   * Constructs a new AJAXDashboardManager object.
   *
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
   *   Cache backend instance to use.
   */
  public function __construct(ModuleHandlerInterface $module_handler, CacheBackendInterface $cache_backend) {
    // Add more services as required.
    $this->moduleHandler = $module_handler;
    $this->setCacheBackend($cache_backend, 'ajax_dashboard', ['ajax_dashboard']);
  }

  /**
   * {@inheritdoc}
   */
  protected function getDiscovery() {
    if (!isset($this->discovery)) {
      $this->discovery = new YamlDiscovery('ajax_dashboard', $this->moduleHandler->getModuleDirectories());
      $this->discovery->addTranslatableProperty('label', 'label_context');
      $this->discovery = new ContainerDerivativeDiscoveryDecorator($this->discovery);
    }
    return $this->discovery;
  }

  /**
   * {@inheritdoc}
   */
  public function processDefinition(&$definition, $plugin_id) {
    parent::processDefinition($definition, $plugin_id);

    // TODO confirm whether we need additional validation.
    if (empty($definition['id'])) {
      throw new PluginException(sprintf('Example plugin property (%s) definition "is" is required.', $plugin_id));
    }
    else {
      $this->moduleHandler->alter('ajax_dashboard', $definition);
    }
  }

}