class Inchoo_Dispatcher_Model_Observer

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class Inchoo_Dispatcher_Model_Observer
{
    //this is hook to Magento's event dispatched before action is run
    public function hookToControllerActionPreDispatch($observer)
    {
        //we compare action name to see if that's action for which we want to add our own event
        if($observer->getEvent()->getControllerAction()->getFullActionName() == 'checkout_cart_add')
        {
            //We are dispatching our own event before action ADD is run and sending parameters we need
            Mage::dispatchEvent("add_to_cart_before", array('request' => $observer->getControllerAction()->getRequest()));
        }
    }
 
    public function hookToControllerActionPostDispatch($observer)
    {
         //we compare action name to see if that's action for which we want to add our own event
        if($observer->getEvent()->getControllerAction()->getFullActionName() == 'checkout_cart_add')
        {
            //We are dispatching our own event before action ADD is run and sending parameters we need
            Mage::dispatchEvent("add_to_cart_after", array('request' => $observer->getControllerAction()->getRequest()));
        }
    }
 
    public function hookToAddToCartBefore($observer)
    {
            //Hooking to our own event
        $request = $observer->getEvent()->getRequest()->getParams();
            // do something with product
        Mage::log("Product ".$request['product']." will be added to cart.");
    }
 
    public function hookToAddToCartAfter($observer)
    {
            //Hooking to our own event
        $request = $observer->getEvent()->getRequest()->getParams();
            // do something with product
        Mage::log("Product ".$request['product']." is added to cart.");
    }
}