Magento: Use cache

$cacheKey = 'CODE_CODE'.Mage::app()->

getStore()->getId();
        if (Mage::app()->useCache('config') && $collection = Mage::app()->loadCache($cacheKey)) {
            $prod = unserialize($collection);
        } else {
            $prod = Mage::getModel()->getCollection;
            ....
           
            if (Mage::app()->useCache('config')) {
                Mage::app()->saveCache(serialize($prod), $cacheKey, array('config'));
            }
        }