>why it is different to onSuccess ... list = result ? (besides that this
isn't working ;-))
1. "list = result" implies that your callback has a reference to the object
that is holding the list. Maybe it would be a problem for you, maybe not
2. "list = result" will make the "list" variable point to a new object. If
you have any other object holding a reference to the previous list object,
it will still point to that object after the assignment, so it won't see the
objects that came from the rpc call
On Mon, Apr 11, 2011 at 10:44 AM, tanteanni <tantea...@hotmail.com> wrote:
> 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?
> >
> > > --
> > > You received this message because you are subscribed to the Google
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> > > For more options, visit this group at
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> >
> > --
> > Magno Machado Paulohttp://blog.magnomachado.com.brhttp://
> code.google.com/p/emballo/
>
> --
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>
--
Magno Machado Paulo
http://blog.magnomachado.com.br
http://code.google.com/p/emballo/
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