DynamicPageCacheTestController.php

<?php

namespace Drupal\dynamic_page_cache_test;

use Drupal\Core\Cache\CacheableResponse;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\user\Entity\User;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

/**
 * Controller routines for dynamic_page_cache_test routes.
 */
class DynamicPageCacheTestController {
    use StringTranslationTrait;
    
    /**
     * A route returning a Response object.
     *
     * @return \Symfony\Component\HttpFoundation\Response
     *   A Response object.
     */
    public function response() {
        return new Response('foobar');
    }
    
    /**
     * A route returning a CacheableResponse object.
     *
     * @return \Drupal\Core\Cache\CacheableResponseInterface
     *   A CacheableResponseInterface object.
     */
    public function cacheableResponse() {
        $user = User::load(1);
        $response = new CacheableResponse($user->label());
        $response->addCacheableDependency($user);
        return $response;
    }
    
    /**
     * A route returning a render array (without cache contexts, so cacheable).
     *
     * @return array
     *   A render array.
     */
    public function html() {
        return [
            'content' => [
                '#markup' => 'Hello world.',
            ],
        ];
    }
    
    /**
     * A route returning a render array (with cache contexts, so cacheable).
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The current request.
     *
     * @return array
     *   A render array.
     *
     * @see html()
     */
    public function htmlWithCacheContexts(Request $request) {
        $build = $this->html();
        $build['dynamic_part'] = [
            '#markup' => $this->t('Hello there, %animal.', [
                '%animal' => $request->query
                    ->get('animal'),
            ]),
            '#cache' => [
                'contexts' => [
                    'url.query_args:animal',
                ],
            ],
        ];
        return $build;
    }
    
    /**
     * A route returning a render array (with max-age=0, so uncacheable)
     *
     * @return array
     *   A render array.
     *
     * @see html()
     */
    public function htmlUncacheableMaxAge() {
        $build = $this->html();
        $build['very_dynamic_part'] = [
            '#markup' => 'Drupal cannot handle the awesomeness of llamas.',
            '#cache' => [
                'max-age' => 0,
            ],
        ];
        return $build;
    }
    
    /**
     * A route returning a render array (with 'user' context, so uncacheable)
     *
     * @return array
     *   A render array.
     *
     * @see html()
     */
    public function htmlUncacheableContexts() {
        $build = $this->html();
        $build['very_dynamic_part'] = [
            '#markup' => $this->t('@username cannot handle the awesomeness of llamas.', [
                '@username' => \Drupal::currentUser()->getDisplayName(),
            ]),
            '#cache' => [
                'contexts' => [
                    'user',
                ],
            ],
        ];
        return $build;
    }
    
    /**
     * A route returning a render array (with a cache tag preventing caching).
     *
     * @return array
     *   A render array.
     *
     * @see html()
     */
    public function htmlUncacheableTags() {
        $build = $this->html();
        $build['very_dynamic_part'] = [
            '#markup' => 'Drupal cannot handle the awesomeness of llamas.',
            '#cache' => [
                'tags' => [
                    'current-temperature',
                ],
            ],
        ];
        return $build;
    }

}