Output Flushing in Magento 2

The article is dedicated to flushing data in Magento 2. Learning one of the significant processes in Magento, you’ll be able to make a distinction between Magento 1 and 2 and go up for the Magento exam.

Flushing data in Magento 2 (read here about Output Flushing in Magento 1) is triggered in \Magento\Framework\App\Bootstrap::run method by calling \Magento\Framework\App\ResponseInterface::sendResponse method.

public function run(AppInterface $application)
{
  <strong>try</strong> {
      <strong>try</strong> {
          \Magento\Framework\Profiler::start('magento');
          $this->initErrorHandler();
          $this->initObjectManager();
          $this->assertMaintenance();
          $this->assertInstalled();
          $response = $application->launch();
          $response->sendResponse();
          \Magento\Framework\Profiler::stop('magento');
      } <strong>catch</strong> (\Exception $e) {
          \Magento\Framework\Profiler::stop('magento');
          if (!$application->catchException($this, $e)) {
              throw $e;
          }
      }
  } catch (\Exception $e) {
      $this->terminate($e);
  }
}

public function run(AppInterface $application)

{

<strong>try</strong> {

\Magento\Framework\Profiler::start('magento');

$this->initErrorHandler();

$this->initObjectManager();

$this->assertMaintenance();

$this->assertInstalled();

$response = $application->launch();

$response->sendResponse();

\Magento\Framework\Profiler::stop('magento');

} <strong>catch</strong> (\Exception $e) {

\Magento\Framework\Profiler::stop('magento');

if (!$application->catchException($this, $e)) {

throw $e;

}

} catch (\Exception $e) {

$this->terminate($e);

}

Depending on request nature (e.g. http, webapi, console command, etc.), this will call an appropriate method of implementing class. In case of HTTP response it will be \Magento\Framework\HTTP\PhpEnvironment\Response::sendResponse method where method will be called.

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public function send()
{
  $this->sendHeaders()
       ->sendContent();
  return $this;
}

public function sendContent()
{
  if ($this->contentSent()) {
      return $this;
  }

  echo $this->getContent();
  $this->contentSent = true;
  return $this;
}

public function send()

{

$this->sendHeaders()

->sendContent();

return $this;

}

public function sendContent()

{

if ($this->contentSent()) {

return $this;

}

echo $this->getContent();

$this->contentSent = true;

return $this;

}

Associated events

controller_front_send_response_before – invokes at the and of \Magento\Framework\App\Http::launch just before returning processed response to \Magento\Framework\App\Bootstrap::run method.

Redirects

Internal redirects

protected $resultRedirectFactory;

public function __construct(
  \Magento\Framework\Controller\ResultFactory $result
) {
  $this->resultRedirectFactory = $result;
}

public function execute()
{
   $resultForward = $this->resultRedirectFactory->create(ResultFactory::TYPE_FORWARD);
   $resultForward>setUrl($this->_redirect->getRefererUrl());

   return $resultForward;         
}

protected $resultRedirectFactory;

public function __construct(

\Magento\Framework\Controller\ResultFactory $result

) {

$this->resultRedirectFactory = $result;

}

public function execute()

{

$resultForward = $this->resultRedirectFactory->create(ResultFactory::TYPE_FORWARD);

$resultForward>setUrl($this->_redirect->getRefererUrl());

return $resultForward;

}

HTTP redirects

protected $resultRedirect;

public function __construct(
  \Magento\Framework\Controller\ResultFactory $result
) {
  $this->resultRedirect = $result;
}

public function execute()
{
   $resultRedirect = $this->resultRedirect->create(ResultFactory::TYPE_REDIRECT);
   $resultRedirect->setUrl($this->_redirect->getRefererUrl());

   return $resultRedirect;         
}