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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