public function getCallable($methodName)
    {
        $this->checkMethodName($methodName);

        $class = $this->getClassName($methodName);
        $method = $this->getMethodName($methodName);

        $object = $this->createObject($class);

        if (!method_exists($object, $method)) {
            throw new JsonRpc\Exception\Method();
        }

        return array($object, $method);
    }