Yet another thing

thing.php

    protected function _set_item_in_memcache($type, $id, $obj) {
        $mc_key = "cache_{$type}_{$id}";
        $this->cache->set($mc_key, json_encode($obj));
    }
    
    protected function _populate_item_from_memcache($type, $id) {
        $mc_key = "cache_{$type}_{$id}";
        $rv = $this->cache->get($mc_key);
        if ($rv === false) return;
        $this->_caches[$type][$id] = json_decode($rv, true);
    }

    protected function _get_item_from_cache($callable, $type, $id) {
        if (!isset($this->_caches[$type])) {
            $this->_caches[$type] = array();
        }
        if (!isset($this->_caches[$type][$id])) {
            $this->_populate_item_from_memcache($type, $id);
            if (!isset($this->_caches[$type][$id])) {
                $this->_caches[$type][$id] = call_user_func_array($callable, array($id));
                $this->_set_item_in_memcache($type, $id, $this->_caches[$type][$id]);
            }
        }
    }

    protected function _get_contact_info($contact_id) {
        //check local process cache first
        $retrieval_func = $this->contacts->get_contact_info;
        return $this->_get_item_from_cache($retrieval_func, 'contact', $contact_id);
    }