Create Observer in the Mage_core_model_app class for the run function

Question

When looking at the class app\code\core\Mage\Core\Model\App.php, we have the following function:

public function run($params)
    {
        $options = isset($params['options']) ? $params['options'] : array();
        $this->baseInit($options);
        Mage::register('application_params', $params);

        if ($this->_cache->processRequest()) {
            $this->getResponse()->sendResponse();
        } else {
            $this->_initModules();
            $this->loadAreaPart(Mage_Core_Model_App_Area::AREA_GLOBAL, Mage_Core_Model_App_Area::PART_EVENTS);

            if ($this->_config->isLocalConfigLoaded()) {
                $scopeCode = isset($params['scope_code']) ? $params['scope_code'] : '';
                $scopeType = isset($params['scope_type']) ? $params['scope_type'] : 'store';
                $this->_initCurrentStore($scopeCode, $scopeType);
                $this->_initRequest();
                Mage_Core_Model_Resource_Setup::applyAllDataUpdates();
            }

            $this->getFrontController()->dispatch();
        }
        return $this;
    }

To add a event/observer we use the following code:

<events>
  <EVENT_TO_HOOK>
    <observers>
      <module>
        <type>singleton</type>
        <class>company_module_model_observer</class>
        <method>methodToCall</method>
      </module>
    </observers>
  </EVENT_TO_HOOK>     
</events>

What event should we add to observe the function run class Mage_Core_Model_App?

Answer 1

Unable to observe function run class Mage_Core_Model_App through an event.

The only event fired in this class was the application_clean_cache. Check out the full list on http://www.nicksays.co.uk/magento-events-cheat-sheet-1-8/

But the above listing is valid for version 1.8 - this above mentioned event no longer exists.

An event is triggered through the method dispatchEvent. For example:

Mage::dispatchEvent('application_clean_cache', array('tags' => $tags));

(source: http://freegento.com/doc/d8/d98/_app_8php-source.html#l01084)

In the function code run in app\code\core\Mage\Core\Model\App.php, posted on the question, we see that there is no call to Mage::dispatchEvent. This means that no event is triggered and therefore there is no event to be observed and captured there.

The alternative is extend the class and make a override of function.

Or (although not recommended) change the function code in Magento, adding the trigger of an event with dispatchEvent...