Injection Framework

[wolfc]

With the injection framework it should be possible to easily inject
values into beans. Note that the injection framework doesn't specify
properties of a bean in the same way as JavaBeans does. Any field or
setter method can constitute a property.

The injection works in two phases:
1. Setup of the environment
2. Injection of objects

The environment could be setup in JNDI, but this is not required
by the injection framework. For JNDI setup an implementation is
provided.

Injection of objects can be specified programatically. For
annotation based injection an implementation is provided.

It's not IoC or MC injection, because it doesn't take into
account dependencies.

Although the injection framework contains annotation processors JSR-269
is left out of scope.

[wolfc]

I'm also putting AOP beyond scope for 3 reasons:

1. Can't get an unit test to work in surefire (/maven2)
2. Both EJB3 container and client launcher don't need the extra functionality
3. Can't think of a proper bind-cut without recurssion into the injection framework

It should be easy to create a separate module which does injection with
AOP.

We'll lose the possibility to have a POJO injection classloader.

[starksm64]

Is there a question here or this is just the plan? As an integration piece, I would think we want an mc dependency injection handler so that an injection reference does result in a property dependency relationship.

[wolfc]

Correct, the MC injection & dependencies are done in the setup phase.
So for example if SessionBean1 wants SessionBean2 injected then SessionBean1 container is registered as being dependant on SessionBean2 container, which will start and put SessionBean2 in JNDI... MC starts SessionBean1 container, put SessionBean1 in JNDI, setup JNDI env (java:comp/env/SessionBean2 -> java:global.ear/SessionBean2/local) and then start the injection phase (java:comp/env/SessionBean2 -> SessionBean1.bean2Interface).
To summarize scope: injection framework does (EJB3) bean injection, while the container (EJB2 + 3) work with MC for dependency injection.