Re: Gin module binding using annotatedWith and AsyncProvider

You should ask on https://groups.google.com/d/forum/google-gin as the GWT Compiler is not involved in these decisions, only the GIN generator.

BTW, what's the error? Does it work if you don't use an AsyncProvider? (direct injection, or through a Provider)

And as a workaround / alternative, I suppose you could use a "@Special Provider<DiSecondary>" and an explicit GWT.runAsync.

On Sunday, August 26, 2012 7:28:39 PM UTC+2, Steve C wrote:

If I want to inject an instance of a specific class based on an annotation, I can do this in a Gin module:

bind(DiSecondary.class).annotatedWith(Special.class).to(DiSecondarySpecialImpl.class);

I also already have:

bind(DiSecondary.class).to(DiSecondaryImpl.class);

I can then retrieve the special instance into my DiMain (Composite wrapping a Panel) constructor with:

@Inject
public DiMain(@Special DiSecondary special) {
  add(special);
}

But, if I want to code-split DiSecondarySpecialImpl using AsyncProvider, the analogous approach does not work:

@Inject
public DiMainAsync(@Special final AsyncProvider<DiSecondary> diSecondaryProvider) {
  diSecondaryProvider.get(new AsyncCallback<DiSecondary>() {
    public void onFailure(Throwable caught) {}
    public void onSuccess(DiSecondary result) {   
      add(result);
    }
  });
}

I get a GWT compiler error.  If I remove the annotation, then, of course, I get the non-special implementation.

Am I being unreasonable to expect that the compiler could apply the annotation to the async provider for the base class instead of the base class itself?

Is there a different route that I can use to get the desired behavior (annotation-based selection of an alternate async loaded class)?

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