thx both of us: to be sure i understand your suggestion:
using list.add also "adds" to the list given in constructor? i know
it's probably a java-noob question but why it is different to
onSuccess ... list = result ? (besides that this isn't working ;-))
On 11 Apr., 14:55, Magno Machado <magn...@gmail.com> wrote:
> try this:
> public class ListLoaderAsyncCallback<T> implements
> AsyncCallback<ArrayList<T>> {
> private final List<T> list;
> public ListLoaderAsyncCallback(List<T> list) {
> this.list = list;
> }
> public void onSuccess(ArrayList<T> result) {
> list.clear();
> list.addAll(result);
> }
> public void onFailure(Throwable caught) {
> ...
> }
>
> }
>
> List<SomeType> myList = ....;
> MyServiceAsync service = ........;
> service.loadSomeData(new ListLoaderAsyncCallback<SomeType>(myList));
>
>
>
>
>
>
>
>
>
> On Mon, Apr 11, 2011 at 9:00 AM, tanteanni <tantea...@hotmail.com> wrote:
> > i am fairly new to gwt and struggling some how on "correct"/"nice" RPC
> > implementation (it is working but code becomes ugly). On my first GWT
> > based apps i often load some lists/data from db into front end. (Lists
> > to be used in combo boxes for instance).
>
> > so if i have a widget that needs 3 different lists (probably
> > List<String> or Map<String, String>) i specify a service-method for
> > each list. the problem is to load all those lists, i have to implement
> > one class (...implements AsyncCallback) for each list.
> > but the only difference between this implementations is that they load
> > the result in different lists:
> > public void onSuccess(){
> > list1 = result
> > }
>
> > so how to implement an abstract callback class that could load its
> > "result" into a given list/object (- a field of mother class)
>
> > (if "call by reference" would exist in java i would giv "list1" as an
> > parameter for constructor and onSucces would load the result into this
> > reference?!)
>
> > an optimal implementation would be if the result type could be a
> > generic type: A class lie this:
>
> > class GeneralCallback<T> implements AsyncCallback<T>{
> > public GeneralCallback(T target){
> > ...
> > }
>
> > public onSuccess(T result){
> > target = result;
> > }
> > }
>
> > is it possible to get such an abstract callback class?
>
> > --
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>
> --
> Magno Machado
> Paulohttp://blog.magnomachado.com.brhttp://code.google.com/p/emballo/
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