Hello all,
I have a Composite with Widgets that are populated from the
database. Let's assume I need to add new Item object and ID for this
object comes from database after object is persisted on the server. So I
did:
private void addItem(String title, String description) {
ItemDTO itemDto = new ItemDTO(0L, title, description, false);
todoService.saveItem(itemDto, new AsyncCallback<ItemDTO>() {
@Override
public void onFailure(Throwable caught) {
Window.alert("Failed to save item");
}
@Override
public void onSuccess(ItemDTO itemDto) {
Window.alert("Item saved");
item.setId(itemDto.getId());
item.setTitle(itemDto.getTitle());
item.setDescription(itemDto.getDescription());
content.add(item);
}
});
This way Item is added to database, but Window.alert is not shown
and UI does not show the item newly added.
If I did this way:
private void addItem(String title, String description) {
Item item = new Item();
item.setTitle(title);
item.setDescription(description);
content.add(item);
ItemDTO itemDto = new ItemDTO(0L, title, description, false);
todoService.saveItem(itemDto, new AsyncCallback<Long>() {
@Override
public void onFailure(Throwable caught) {
Window.alert("Failed to save item");
}
@Override
public void onSuccess(Long id) {
Window.alert("Item saved");
updateItem(id);
}
});
}
private void updateItem(Long id) {
Item item = (Item) content.getWidget(content.getWidgetCount()-1);
item.setId(id);
}
Everything works as expected, but "update" item logic is a bit
dangerous. Why I can't add item object in callback? What's wrong with a
first example?
Thank you.
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