Where to initialize an AsyncDataProvider?

Hi everybody,

I have a short but painful question: Where is the right place to initialize my AsyncDataProvider?

Story so far: 

In my Controller class I have my AsyncDataProvider as reference and the search method where I built the asynchronous callback and process my data, looks like this.

private final ClientServiceAsync service = GWT.create(ClientService.class);  private AsyncDataProvider<Model> provider;  private List<Model> dataList = new ArrayList<Model>();    // other stuff here...    void search(final TO_Search pSearchCriteria) {        // Associate an async data provider to the table      provider = new AsyncDataProvider<Model>() {            @Override          protected void onRangeChanged(HasData<Model> display) {              final int start = display.getVisibleRange().getStart();              int length = display.getVisibleRange().getLength();                // Get the ColumnSortInfo from the table.              final ColumnSortList sortList = view.cellTable.getColumnSortList();              final ColumnSortInfo sortInfo = sortList.get(0);              final String dataStoreName = sortInfo.getColumn().getDataStoreName();              final boolean isAscending = sortInfo.isAscending();                AsyncCallback<TO_Result> callback = new AsyncCallback<TO_Result>() {                  @Override                  public void onFailure(Throwable caught) {                      Window.alert(caught.getMessage());                  }                    @Override                  public void onSuccess(TO_Result data) {                        if (!GWT.isProdMode()) {                          GWT.log(this.getClass() + ": Remote Procedure Call - Success");                          GWT.log(this.getClass() + ": No. of results = " + data.getCount());                      }                        if (data.getCount() != 0) {                            dataList.addAll(data.getResults());                            updateRowData(start, data.getResults());                          updateRowCount(data.getCount(), true);                            if (data.isGoToFirstPage()) {                              view.setPagerFirstPage();                          }                        } else {                            dataList.clear();                          updateRowData(start, dataList);                          updateRowCount(data.getCount(), true);                            view.simplePopup.setWidget(new HTML(CONSTANTS.noSearchResults()));                      }                          }              };              service.search(searchCriteria, start, length, dataStoreName, isAscending, callback);          }      };  } // end search()

This solution works very well, most of time. Sometimes it shows a very strange behavior and comes up with old search results. And it looks absolutely wrong for me that the AsyncDataProvider is always new created for every search.

Until now I have no other idea, how I could do this, because in the end, I need to call my service, which is defined in the AsyncDataProvider.

Is this the right design? 

Thanks a lot in advance. 

Best regards

 Jochen

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