It is good approach to fetch same data from server instead of maintain data
block at client side.
If you write such a logic like
1)Maintain index in contact object or create one custom bean which has
three variable like start, end and List<Contact>.
2)Create one List<Contact> or custom bean in DBHelper class
3) Before rpc call check in list if exist then don't make rpc call
4) If not exist data in list from start to end range
But according to better practice, make rpc call is not big cost.
Thanks,
Bhumika
On Tuesday, 8 October 2013 14:06:39 UTC+5:30, Nir Avital wrote:
>
> Hi,
>
> We are trying to create a cell table with tons of entries.
> We use pagination. (AsyncDataProvider and Pager) and would like to fetch
> on demand entries.
>
> Currently it does work as intended,
>
> only problem is, when we show some entries on the cell table (let's say
> entries #1-#25)
> and then change page to fetch the entries (#1000 - #1025)
> when changing back again to entries #1-#25 gwt still makes a server call !
> we would like to create a simple cache in the client and by this skip the
> unnecessary call like the example above.
>
> any ideas?
>
> Thanks.
>
>
> P.S here is a piece of code of the onRangeChanged:
>
> AsyncDataProvider<Contact> provider = new AsyncDataProvider<Contact>() {
> @Override
> protected void onRangeChanged(HasData<Contact> display) {
> int start = display.getVisibleRange().getStart();
> int end = start + display.getVisibleRange().getLength();
> end = end >= DBHelper.size() ? DBHelper.size() : end;
> List<Contact> sub = DBHelper.get(start, end);
> updateRowData(start, sub);
> }
> };
>
>
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