Allez plus Loin avec CDI En moins de 5 ans d’existence, Contexts and Dependency Injection (CDI) est devenue l’une des principale spécification de Java EE. Néanmoins, CDI est bien souvent perçu comme une simple solution d’injection de dépendance enrichie alors que cette spécification est bien plus riche que ça. Lors de cette présentation, après un rapide rappel des fonctionnalités de base de CDI, nous montrerons comment son utilisation avancée permet Java EE en intégrant des technologies legacy ou plus récent de manière naturelle. Nous finirons avec le travail en cours sur CDI 2.0 qui a commencé début septembre.

1. CDI 2.0 new features

3. Modularity
Provide sub specs in CDI (called parts) that can be used independently
Each part should have an implementation

4. Modularity - Why ?
We want to add new features to CDI without making it a bloated spec
Having parts will help CDI adoption. Third party won’t have to get the whole
spec and impl if they don’t want to

5. Modularity - What parts ?
Right now we are thinking of 3 parts :
CDI Light : DI and events without normal scope and AOP
Providing lighter CDI implementations
Full CDI
Full CDI with Java EE / other spec integration

6. Modularity - challenges
Be sure of the parts - too much or not enough granularity
Having an RI and TCK for each part can be an important work

7. Java SE support
using CDI outside Java EE

8. Java SE support - Why?
To provide a mean of building new stacks out of Java EE
To boost CDI adoption for Spec working already on Java SE

9. Java SE support - challenges
Extract “Java EE” features across the spec to create a chapter dedicated to it
Decide what existing SE support we standardise
Add SPI for CDI integration with standard services:
JPA
Transaction
Security

10. Enhancing events
Making popular feature even more popular

11. Asynchronous Events
@Inject
Event<Payload> evt;
public void fireAsyncWithCallBack() {
evt.fireAsync(new Payload(),
callBack -> System.out.println("Job done”));
}
Using lambdas to provide
optional callback

12. Events Ordering
public void firstObserver(@Observes(1) Payload pl) {}
public void secondObserver(@Observes(2) Payload pl) {}

13. AOP enhancement
Support AOP on custom or produced bean
Improve interceptor chaining
Support Self Injection to call intercepted / decorated method from the same
bean

14. SPI and contexts enhancement
Standardise CDI boot
Add helpers to create new metadata:
AnnotatedTypeBuilder
BeanBuilder
Add SPI to activate / deactivate contexts

15. CDI 2.0 needs you
CDI 2.0 specification is open to everyone
Come on join us on the mailing list and IRC channel
All infos on http://cdi-spec.org or by following to @cdispec on twitter
The more we are the more we’ll deliver

16. Questions ?