The first way you implicitly bind to an instance (so provider is
singleton itself - guice will never instantiate it):
bind(BaseModelProvider.class).toInstance(new BaseModelProvider());
bind(Model.class).annotatedWith(Names.named("index")).toProvider(BaseModelProvider.class);
The second way you implicitly bind in prototype scope (no scope):
bind(BaseModelProvider.class);
bind(Model.class).annotatedWith(Names.named("index")).toProvider(BaseModelProvider.class);
If you want your providers to be in some scope then you should let
Guice create them for you and either annotate them with scoping
annotation (e.g. with @Singleton) or bind them in scope (like
bind(BaseModelProvider.class).in(Singleton.class);).
2013/1/5 Michael <[email protected]>:
> Hi All,
>
> I found a very interesting thing about the scope of the provider. Here is
> the code of BaseModelProvider
>
> public class BaseModelProvider implements Provider<Model> {
> private int num;
> @Override
> public Model get() {
> System.out.println(num++);
> return new Model();
> }
> --------------------------------------------------------------------
> this.bind(Model.class).annotatedWith(Names.named("index")).toProvider(new
> BaseModelProvider());
>
> This way gives : 1,2,3,4,5,6.....(in singleton scope)
> ---------------
> this.bind(Model.class).annotatedWith(Names.named("index")).toProvider(BaseModelProvider.class);
> This way gives : 0,0,0,0,0.....(in request scope)
>
>
> I don't understand the different about this two definitions. So anybody
> knows how it works ? many thanks!
>
> BTW: I just want bind many providers dynamically within a loop, So I am
> using the .toProvider(Prvider<? extends Model> instance).
>
>
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