Redirect to specific controller from observer without changing my current browser Url

Question

I had written a observer to trap product view page event and it is working fine.Now in that code i want to call a controller and pass the product id in it and render the custom view.phtml file, so how can i call that controller without changing my current browser url and render the view.phtml file on same url.

My Observer Code is Given Below

public function getProductView(Varien_Event_Observer $observer)
{         
      $resp = $observer->getEvent()->getFront()->getAction()->getRequest();
      $requestUri = $resp->getRequestString();            
       if ($resp->getActionName() == 'noRoute'){
           $requestUri = $resp->getRequestString();
           $requestUri = ltrim($requestUri, '/');
           $this->db = Mage::getSingleton('core/resource')->getConnection('core_write');
           $sql = "SELECT * FROM core_url_rewrite WHERE request_path like '%".$requestUri."%'";
           $data = $this->db->fetchAll($sql);
           // header("Location: " . Mage::getBaseUrl() . "customproduct/prodId=".$data[0]['product_id'], 301);
           // exit;

           //header('location:'.MAGE::getBaseurl()."customproduct",301);

           //Edit: action not passed in to this event; passed in generic generate_blocks event
             //Mage::getUrl('customproduct');
           exit;
       }
    }

Answer 1

You can do this by below code:

$identifier=trim($resp->getPathInfo(),'/');
    $resp
    ->setModuleName('ModuleRouterName')  
                ->setControllerName('controllerName')
                ->setActionName('YOurActioname');

//$resp->setDispatched(true);  

$resp->setAlias(
                Mage_Core_Model_Url_Rewrite::REWRITE_REQUEST_PATH_ALIAS,
                $identifier
        );
return true;

setDispatched(true/false) not sure..