Let's get the OSGI fix in, and THEN cut beta5.
c.
On 2 Apr 2014, at 10:57, Sam Berlin wrote:
No way to extend it to provide other wrapper classes, no. Although
you
could pretty easily write a wrapper around it (e.g, ScalaOptionBinder)
that
binds your custom wrapper to something that delegates to Optional<T>
(and
Optional<Provider<T>, etc.). That'd require users to use your
wrapping
binder, though. If you don't want to do that, you could use the
Guice SPI
to analyze all module elements & automatically create new bindings for
anything that's an OptionalBinderBinding, delegating to the
actual/default
values.
The latest push included one
commit<https://code.google.com/p/google-guice/source/detail?r=bab9b6082ff7c3aefac2dc8c7de0468fe60fe8f6>that
we had to rollback internally (we're not exactly sure what's going
wrong, but it caused a few tests in one project to become flaky).. so
we
could theoretically cut a new beta with the rollback. But hopefully
we can
figure out what's going wrong, fix it, and cut a better beta.
sam
On Wed, Apr 2, 2014 at 1:46 PM, Nate Bauernfeind
<[email protected]
wrote:
I'm very excited about this; are you going to cut another beta
release
anytime soon?
Is it possible to extend this to use other wrapper classes? I'd like
to
add this to the Scala-Guice project for Scala's option class if
possible.
On Apr 1, 2014 7:33 PM, "Sam Berlin" <[email protected]> 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
--
You received this message because you are subscribed to the Google
Groups
"google-guice" group.
To unsubscribe from this group and stop receiving emails from it,
send an
email to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/google-guice.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google
Groups
"google-guice" group.
To unsubscribe from this group and stop receiving emails from it,
send an
email to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/google-guice.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google
Groups "google-guice" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/google-guice.
For more options, visit https://groups.google.com/d/optout.
Christian Gruber :: Google, Inc. :: Java Core Libraries :: Dependency
Injection
email: [email protected] :::: mobile: +1 (646) 807-9839
--
You received this message because you are subscribed to the Google Groups
"google-guice" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/google-guice.
For more options, visit https://groups.google.com/d/optout.
