So you have 2 caching levels (cache, request)? I recommend making a
request-scoped container object, inject that instead. then that can
look up the cache and store it in a map locally if needed:
@RequestScoped
public class MyCache {
private final Map<Class<Widget>, Widget> cache = new ...;
@Inject Cache mainCache; //the main cache
public Widget getFromCacheOrMakeNew(Class<Widget> cl) {
if (cache.containsKey(cl)) return cache.get(cl);
Widget w = cache.get(cl);
mainCache.put(cl, w);
return w;
}
}
Then inject MyCache into your servlet.
Dhanji.
On Thu, Dec 4, 2008 at 5:20 AM, wolffiex <[EMAIL PROTECTED]> wrote:
>
> Hi all,
> I'm just starting to use scopes, and I'm wondering how to do this:
>
> I have an object which can sometimes be cached. I want to consult the
> cache and/or create a new object and then put that in the request
> scope for DI. So I have something like this
>
> public void doGet(HttpServletRequest request, HttpServletResponse
> response)
> throws ServletException {
> Widget widget = getFromCacheOrMakeNew(request);
>
> //now bind this widget instance to request scope...
>
>
> I naively tried this kind of thing:
>
> ServletScopes.REQUEST.scope(Key.get(Widget.class), new
> Provider<Widget>(){
> public Widget get() {
> return widget;
> }
> });
>
> But guice is still looking for a constructor for Widget. Any guidance
> here? I think that really what's going on is that Widget lives in a
> custom scope, but I'd like to avoid implementing one if possible.
>
> TIA,
> A
> >
>
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