Why would want to cache the result? what happened if the results returned are
big and if that s not enought, what will happened if 5000 concurrent users
are accessing the paging and hence caching a potential big records returned?
the memory of the server will be eaten away right?
Timo Stamm wrote:
>
> Steve Knight schrieb:
>> If my SortableDataProvider implementation will always return the max
>> number
>> of results (I'm not using paging), is it safe to have the size() method
>> simply return Integer.MAX_VALUE instead of performing a database query to
>> count the actual results?
>
> You shouldn't. It might not give you problems right now, but you break
> the contract with the interface.
>
> You can cache the result so that you do only one query per request to
> get both the result size and the result values. Use onDetach to clear
> the cache after each request.
>
>
> It should look like this (pseudo-code):
>
>
> private List result;
>
> void onDetach() {
> result = null;
> }
>
> Iterator iterator(from, to) {
> return getData().iterator();
> }
>
> int size() {
> return result.size();
> }
>
> private Collection getData() {
> if (result == null) {
> result = dbquery(from, to);
> }
> return result;
> }
>
>
> Timo
>
>
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