I have investigated this through experimentation. You can control the
scope of the Provider and/or the object being provided separately.
The following code ensures that a single Provider is created
bind(IConsumer.class).toProvider(ConsumerProvider.class);
bind(ConsumerProvider.class).asEagerSingleton();
While the following code ensures that BOTH the provider and the object
provided are singletons:
bind(IConsumer.class).toProvider(ConsumerProvider.class).asEagerSingleton();
While the following code ensures every injection of a provider and
every such object provided are distinct objects:
bind(IConsumer.class).toProvider(ConsumerProvider.class);
On Jan 9, 6:05 am, Sam Berlin <[email protected]> wrote:
> The original poster was asking about the Provider itself, not the scope of
> what it provides.
>
> sam
> On Jan 9, 2012 4:45 AM, "unguiculus" <[email protected]> wrote:
>
>
>
>
>
>
>
> > Sam,
>
> > This is not quite correct. @Provides methods create unscoped instances
> > unless they are annotated with a scope annotation (e. g. @Singleton).
> > I think the documentation on this could be improved. It should
> > especially be mentioned that scoping is possible.
>
> >http://code.google.com/p/google-guice/wiki/ProvidesMethods
>
> > Reinhard
>
> > > I think the catch is that toProvider(SomeProvider.class) is an unscoped
> > > provider binding, so each injection of Provider<T> will create a new
> > > instance of the Provider (I think), so there's no shared state since each
> > > instance is different. @Provides is analogous to
> > > toProvider(providerInstance), which in turn is analogous to
> > > bind(..).toInstance(..), all of which act as singletons and need to be
> > > thread-safe.
>
> > > sam
>
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