I like it, similar to what Dagger has for @Provides(SET).
I also really like OptionalBinder. Previously I used Modules.override(new
OverridableBindingsModule(), ...) to provide default implementations.
On Wednesday, 2 April 2014 09:41:45 UTC-4, Sam Berlin wrote:
>
> I've been thinking also about some kind of syntax like:
>
> MyModule extends AbstractModule {
> configure() { install(Multibindings.forModule(this)); }
> @OptionalProvides(DEFAULT) Foo provideDefaultFoo(..) { .. }
> @OptionalProvides(ACTUAL) Foo provideActualFoo(..) { .. }
> @SetProvides Foo provideItemForSetOfFoo(..) { .. }
> @MapProvides MapBinderEntry<Key, Foo> provideItemForMapOfKeyToFoo(..) {
> .. }
> }
>
> ... need to experiment and see if those pan out.
>
> sam
>
>
> On Wed, Apr 2, 2014 at 9:20 AM, Filipe Sousa <[email protected]<javascript:>
> > wrote:
>
>> That's excellent
>>
>>
>>
>> On Wed, Apr 2, 2014 at 1:33 AM, Sam Berlin <[email protected]<javascript:>
>> > wrote:
>>
>>> Ever wanted to:
>>> 1) Set default binding in a library or framework that users can change?
>>> 2) Inject something into a library or framework that isn't required,
>>> but would be better if a user could set it?
>>> 3) Inject an optional value into a constructor?
>>>
>>> OptionalBinder lets you do that. Christian just pushed out some of our
>>> recent internal changes, including the introduction of OptionalBinder to
>>> the multibindings extension.
>>>
>>> Some example usage:
>>>
>>> 1) Setting a default binding that a user can override:
>>> Library: *OptionalBinder.newOptionalBinder(binder(), Foo.class)*
>>> * .setDefault().to(DefaultFoo.class);*
>>> At this point, code can inject '*Foo*' (or *Optional<Foo>)*, and
>>> will get a *DefaultFoo.*
>>>
>>> User: *OptionalBinder.newOptionalBinder(binder(), Foo.class)*
>>> * .setBinding().to(CustomFoo.class);*
>>> Once a user calls setBinding(), injections of *Foo* (or
>>> *Optional<Foo>)* will start providing *CustomFoo* instead.
>>>
>>> 2) Setting a binding that isn't required (e.g, no default value), but a
>>> user can supply.
>>> Library: *OptionalBinder.newOptionalBinder(binder(), Foo.class);*
>>> At this point, code *can't* inject *Foo* -- it will fail saying the
>>> binding isn't supplied. Code *can* (and should) inject *Optional<Foo>*,
>>> though, and the optional will be absent.
>>>
>>> User: *OptionalBinder.newOptionalBinder(binder(), Foo.class)*
>>> * .setBinding().to(CustomFoo.class);*
>>> Once a user calls setBinding(), *Optional<Foo>* will be present and
>>> supply the *CustomFoo*. Also, *Foo* can be directly injected now
>>> (although only user could should do that, since the user code is the only
>>> part that guarantees the binding will be there -- library code should still
>>> inject the* Optional<Foo>*).
>>>
>>> Please report back if you have any issues or suggestions for improvement.
>>>
>>> Thanks!
>>>
>>> sam
>>>
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>>
>>
>>
>> --
>> Filipe Sousa
>>
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>>
>
>
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