apps_controllers_NewsController.php

<?php

class NewsController extends \Phalcon\Mvc\Controller
{

	public function indexAction()
	{

	}

	/**
	 * @Cache(lifetime=86400)
	 */
	public function showAction($slug)
	{
		$this->view->article = Article::findFirstByTitle($slug);
	}

}

apps_plugins_CacheEnablerPlugin.php

<?php

class CacheEnablerPlugin extends \Phalcon\Mvc\User\Plugin
{

	public function beforeExecuteRoute($event, $dispatcher)
	{

		$annotations = $this->annotations->getMethod(
			$dispatcher->getActiveController(),
			$dispatcher->getActiveMethod()
		);

		//Check if the method has an annotation 'Cache'
		if ($annotations->has('Cache')) {

			//Get the lifetime
			$lifetime = $annotations->get('Cache')->getNamedParameter('lifetime');

			//Enable the cache
			$this->view->cache(array('lifetime' => $lifetime));
		}

	}

}

public_index.php

<?php

$di = new \Phalcon\DI\FactoryDefault();

$eventsManager = new \Phalcon\Events\Manager();

//Attach the plugin to 'dispatch' events
$eventsManager->attach('dispatch', new CacheEnablerPlugin());

$di['dispatcher'] = function() use ($eventsManager) {
	$dispatcher = new \Phalcon\Mvc\Dispatcher();
	$dispatcher->setEventsManager($eventsManager);
	return $dispatcher;
};

$di['view'] = function() {
	$view = new \Phalcon\Mvc\View();
	$view->setViewsDir('unit-tests/views/');
	return $view;
};

$di['annotations'] = function() {
	return new \Phalcon\Annotations\Adapter\Memory();
};

$di['viewCache'] = function() {

    //Cache data for one day by default
    $frontCache = new \Phalcon\Cache\Frontend\Output(array(
        "lifetime" => 86400
    ));

    //Memcached connection settings
    $cache = new \Phalcon\Cache\Backend\Memcache($frontCache, array(
        "host" => "localhost",
        "port" => "11211"
    ));

    return $cache;
};

$app = new \Phalcon\Mvc\Application();
$app->setDi($di);
echo $app->handle()->getContent();