class CategorizingPluginManager

class CategorizingPluginManager extends DefaultPluginManager implements CategorizingPluginManagerInterface {
    use CategorizingPluginManagerTrait;
    
    /**
     * Replace the constructor so we can instantiate a stub.
     *
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     * @param \Drupal\Core\Extension\ModuleExtensionList $module_extension_list
     *   The module extension list.
     */
    public function __construct(ModuleHandlerInterface $module_handler, ModuleExtensionList $module_extension_list) {
        $this->moduleHandler = $module_handler;
        $this->moduleExtensionList = $module_extension_list;
    }
    
    /**
     * {@inheritdoc}
     *
     * Provides some test definitions to the trait.
     */
    public function getDefinitions() {
        return [
            'cucumber' => [
                'label' => 'cucumber',
                'category' => 'vegetables',
            ],
            'apple' => [
                'label' => 'apple',
                'category' => 'fruits',
            ],
            'mango' => [
                'label' => 'mango',
                'category' => 'fruits',
            ],
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function processDefinition(&$definition, $plugin_id) : void {
        parent::processDefinition($definition, $plugin_id);
        $this->processDefinitionCategory($definition);
    }

}