Thinking Piece of Cake 🍰

Today I’m ready to add a feature which is caching HOOLAY.cn index page . You know that web page service powered by Phalcon .

Why it ? Maybe Phalcon is highly decoupled ? C extension ? Full Stack framework ? …balala

Actually i just want to solve my problem . Aha . so i did these code as below . 

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public function indexAction()
{
  $this->view->setRenderLevel(View::LEVEL_ACTION_VIEW);
  $cachePageExists = $this->view->getCache()->exists(IAppCacheKeysManager::KEY_VIEW_CACHE_HOME);
  if (!$cachePageExists) {
    // do sth
  }
  // cache page
  $this->view->cache([
      'key' => IAppCacheKeysManager::KEY_VIEW_CACHE_HOME,
  ]);
}

Are you kidding me ? It’s not working , but official docs as it is ! So my first thought is debugging by Breakpoints to know cache how to work .
You know i can’t do this . These all be compiled ! Or any ?Trace tools could help me ? No . Read the Fucking Source !

Absolutely i need to check out View Component. Then i found something .
phalcon/mvc/view.zep

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public function cache(var options = true) -> <View>
{
	var viewOptions, cacheOptions, key, value, cacheLevel;
	if fetch cacheLevel, cacheOptions["level"] {
		let this->_cacheLevel = cacheLevel;
	} else {
		let this->_cacheLevel = self::LEVEL_MAIN_LAYOUT;
	}
}
protected function _engineRender(engines, string viewPath, bool ...) {
/* codes */
  if renderLevel >= cacheLevel {
  	if cache->isStarted() == false {
  		let cachedView = cache->start(key, lifetime);
    }
  }
/* codes */
}

You can see pivotal code above . There is a level option . We did not settle it & if renderLevel < cacheLevel Cache won’t be started ! So we need set cacheLevel less than or equal renderLevel . Codes as below : 

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// cache page
$this->view->cache([
    'key' => IAppCacheKeysManager::KEY_VIEW_CACHE_HOME,
    'level' => View::LEVEL_ACTION_VIEW,
]);

Yep . The problem was solved and an issue was associated 🍰 . But something not finished for me . I drawn a diagram about web application request flow :

/images/web_request.png

PS：oh… Where is “middleware” ? Everything is “middleware” when it on a line ? That Is Really Important ?

I am thinking the Phalcon View Component how to render & cache these view fragments . So i got these fake code (Just Logic) below .

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$view->start();
  $view->render() {
    $view->_engineRender() {
      $cache->start(); // turn on output buffering
      $engineTemplate->render() {
        require $compiledTemplate; // output to buffering
        $view->setContent(ob_get_content());
      }
    }
    $cache->save(); // save output buffering
    $cache->stop(); // stop collect buffer content
  }
$view->finish();
$response->setConent($view->getContent());
$response->send();

Done . That’s all :)