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<?php |
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namespace App\LazyRendering\Http; |
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use App\Blog\Entity\Post; |
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use App\Blog\Post\PostRepository; |
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use App\Blog\Widget\PostCard; |
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use App\LazyRendering\View\MainLayout; |
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use Cycle\ORM\ORMInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use RuntimeException; |
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use Yiisoft\Html\Html; |
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class StreamedController extends BaseController |
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{ |
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public const ROUTE_NAME = 'lazy-render'; |
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protected $pageLayout = MainLayout::class; |
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public function pageIndex(): iterable |
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{ |
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foreach (get_class_methods($this) as $method) { |
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$isPage = strpos($method, 'page') === 0; |
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if (!$isPage || $method === __FUNCTION__) { |
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continue; |
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} |
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$page = substr($method, 4); |
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$pageName = ltrim(preg_replace('/([A-Z][a-z])/u', ' $1', $page)); |
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yield '<li>' |
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. "{$pageName} :: " |
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. Html::a('Lazy', $this->urlGenerator->generate(static::ROUTE_NAME, ['page' => $page])) |
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. ' :: ' |
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. Html::a( |
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'Classic Mode', |
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$this->urlGenerator->generate(static::ROUTE_NAME, ['page' => $page, 'forceBuffering' => 1]) |
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) |
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. ' :: ' |
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. Html::a( |
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'Combined Mode', |
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$this->urlGenerator->generate(static::ROUTE_NAME, ['page' => $page, 'forceBuffering' => 2]) |
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) |
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. '</li>'; |
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} ?> |
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<div class="mt-5"> |
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<p> |
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<b>Lazy Mode</b> - deferred rendering pages. Page renders as it emits. |
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</p> |
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<p> |
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<b>Classic Mode</b> (imitation) - page is rendered and buffered before the response object is sent back |
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via pipeline. |
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</p> |
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<p> |
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<b>Combined Mode</b> - deferred rendering pages. First yielded value will be emitted immediately, |
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the rest of the contents will be buffered and emitted in one piece |
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</p> |
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<p> |
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<a href="https://github.com/yiisoft/yii-demo/pull/59">About this on GitHub</a> |
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</p> |
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</div> |
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<?php |
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} |
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public function pageAllPosts(ORMInterface $orm, int $interval = 0): iterable |
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{ |
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yield '<h1>Streamed output</h1>'; |
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$startTime = microtime(true); |
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/** @var PostRepository $postRepo */ |
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$postRepo = $orm->getRepository(Post::class); |
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$pages = $postRepo->findAllPreloaded(); |
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yield '<h2>Total posts: ' . $pages->count() . '</h2>'; |
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$afterCountTime = microtime(true); |
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yield '<h5>Time to a count query: ' . (int)(1_000_000 * ($afterCountTime - $startTime)) . 'μs</h5>'; |
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$card = PostCard::widget(); |
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$previousPostTime = microtime(true); |
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# type $stream->read() instead of $stream->getIterator() |
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# to disable lazy loading and load all posts in buffer: |
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/** @var Post $post */ |
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foreach ($pages->getIterator() as $post) { |
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$currentPostTime = microtime(true); |
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yield (string)$card->post($post) |
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. '<h5>Getting item time: ' . (int)(1_000_000 * ($currentPostTime - $previousPostTime)) . 'μs</h5>'; |
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usleep($interval); |
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$previousPostTime = microtime(true); |
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} |
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} |
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public function pageAllPostsWithInterval(ORMInterface $orm): iterable |
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{ |
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# disable time limit |
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set_time_limit(0); |
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return $this->pageAllPosts($orm, 150_000); |
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} |
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public function pageFewPostsAndError(ORMInterface $orm): iterable |
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{ |
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yield '<h1>Streamed out with error after 3 posts</h1>'; |
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/** @var PostRepository $postRepo */ |
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$postRepo = $orm->getRepository(Post::class); |
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$pages = $postRepo->findAllPreloaded()->withLimit(3); |
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yield '<h2>Total posts: ' . $pages->count() . '</h2>'; |
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$card = PostCard::widget(); |
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/** @var Post $post */ |
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foreach ($pages->read() as $post) { |
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yield (string)$card->post($post); |
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} |
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throw new RuntimeException('Just error'); |
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} |
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public function pagePageWithEchoAndOutputBufferingBetweenYields(): iterable |
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{ |
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yield '<h1>Page With Echo And Output Buffering Between Yields</h1>'; |
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for ($i = 1, $j = 20; $i < $j; ++$i) { |
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if ($i % 2 === 0) { |
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yield "<div>{$i} - yielded</div>"; |
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} else { |
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echo "<div>{$i} - <b>printed</b></div>"; |
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} |
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} |
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} |
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public function pageDirectEchoWithoutBufferingBetweenYields(): ResponseInterface |
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{ |
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$generator = static function () { |
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echo '<h1>Direct Echo Without Buffering Between Yields</h1>'; |
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for ($i = 1, $j = 20; $i < $j; ++$i) { |
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if ($i % 2 === 0) { |
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yield "<div>{$i} - yielded</div>"; |
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} else { |
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echo "<div>{$i} - <b>printed</b></div>"; |
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} |
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} |
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}; |
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$stream = new GeneratorStream($generator()); |
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return $this->responseFactory->createResponse()->withBody($stream); |
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} |
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} |
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yiisoft /
yii-demo
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