Take a look at the great beer story:
http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/faca1575f306ba0f?pli=1
This story should be included in Google's GWT FAQ
Paul
Mark wrote:
> Hello,
>
> I've got a strange (at least for me) problem:
>
>
> Start.java:
>
> new RetrieveDeck(deck); // this starts a new query to the server
> where it gets a json object
> System.out.println(deck + " size:" + deck.size()); // get debug
> information
>
>
> RetrieveDeck.java:
>
> public RetrieveDeck(FlashCardList deck) {
> this.deck = deck;
>
> String url = URL.encode(GWT.getModuleBaseURL() + "sampleDeck");
> RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);
>
> builder.sendRequest(null, new RequestCallback() {
> @Override
> public void onResponseReceived(Request request,
> Response response) {
> if (200 == response.getStatusCode()) {
> JsArray<FlashCardData> tmp =
> FlashCardData
>
> .asArrayOfFlashCards(response.getText());
>
> getDeck().populate(tmp); //
> here i pass the data to be added in
> a list
> });
>
> protected FlashCardList getDeck() {
> return deck;
> }
> }
>
>
> List.java:
>
> public void populate(JsArray<FlashCardData> decks) {
> for (int i = 0; i < decks.length(); i++) {
> add( /* get a lot of infomation and add it to the list */);
> }
> System.out.println(this + " size:" + size()); // get debug
> information
> }
>
> This all should work fine (I think) but if I run the program I get the
> following output:
>
> .client.cards.flashcardl...@19fdee7 size:0 // this is from Start.java
> .client.cards.flashcardl...@19fdee7 size:2 // this is form List.java
>
> As you can see the empty list at the beginning is first printed ...
> How can I make the program stop until the list is populated?
>
> Thank you very much.
> Mark
>
>
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