CurrentUser.php

<?php

namespace Drupal\user\Plugin\views\argument_default;

use Drupal\Core\Cache\Cache;
use Drupal\Core\Cache\CacheableDependencyInterface;
use Drupal\views\Plugin\views\argument_default\ArgumentDefaultPluginBase;

/**
 * Default argument plugin to extract the current user.
 *
 * This plugin actually has no options so it does not need to do a great deal.
 *
 * @ViewsArgumentDefault(
 *   id = "current_user",
 *   title = @Translation("User ID from logged in user")
 * )
 */
class CurrentUser extends ArgumentDefaultPluginBase implements CacheableDependencyInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getArgument() {
        return \Drupal::currentUser()->id();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheMaxAge() {
        return Cache::PERMANENT;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheContexts() {
        return [
            'user',
        ];
    }

}