type QueueCallback<State> = fn(_: &Connection, _: Message<ObjectId, OwnedFd>, _: &mut State, _: Arc<dyn ObjectData>, _: &QueueHandle<State>) -> Result<(), DispatchError>;type QueueCallback<State> = fn(_: &Connection, _: Message<ObjectId, OwnedFd>, _: &mut State, _: Arc<dyn ObjectData>, _: &QueueHandle<State>) -> Result<(), DispatchError>;