Client/Server communcation (SharedState) with a map or array with large dat

Vaadin 6 / 7 / 8
1

In my understanding, by using shared state, if you modify only one element in an array or in a map, it will transmit the entire thing. How do you deal with that if the data in that map/array is big and you want to optimize for performance.

E.g. you have say 500 items in that array and only one or two are changing once in a while.
Obviously having 500 fields in the shared state is not feasible. On the other hand, transmitting all 500 items every time a single item changes is very heavy and slow.

It would be nice to only transmit the delta of the array.

Thanks!

2

Yes, unfortunately shared state does not support deltas. You can work around it by using RPC calls instead, eg. something like

interface MyDiffRpc extends ClientRpc {
    public void sendWholeThing(List<Foo> list);
    public void updateElem(int i, Foo newElem);
    public void insertElem(int i, Foo insertedElem);
    public void removeElem(int i);
}
3

thanks johannes! will do it that way then