public BroadcastDispatch<T> add(String methodName, Action<?> action) {
        assertIsMethod(methodName);
        return add(action, new ActionInvocationHandler(methodName, Cast.<Action<Object>>uncheckedNonnullCast(action)));
    }

    abstract BroadcastDispatch<T> add(Object handler, Dispatch<MethodInvocation> dispatch);

    private void assertIsMethod(String methodName) {
        for (Method method : type.getMethods()) {