[cdi-dev] Easier access to CDI outside of Java EE, easier access to instances

[Mathieu ANCELIN]

Hi Pete,

I'm a little concerned with the classloading policy in the CDI class :-)

The code strongly depends on Thread.currentThread().getContextClassLoader()
which isn't always appropriate, for instance if you try to use it outside of
Java EE platform it will not work as expected. Furthermore CDI providers are
statically cached once for all, I'm not sure it will nicely work with
multiple CDI applications. Maybe we can discuss about enhancing the CDI
class to provide another "current()" method with a classloader parameter or
a "CDI provider factory" parameter.

Also, as the "current()" method does not take parameters, CDI
implementations will need to rely on some static discriminant like TCCL or
something like that to find the CDI container of the current application
which isn't always possible. Maybe we can discuss about providing another
"current()" (or any other name) method with a discriminant parameter to
target the right app.

I've just seen Stuart's pull request. It should work in a Java SE
environment, but I'm not sure about modular environment.

On Wed, Sep 7, 2011 at 12:26 AM, Pete Muir <pmuir at redhat.com> wrote:

> Regarding https://issues.jboss.org/browse/CDI-14, I've created this patch
> https://github.com/jboss/cdi/pull/43.
>
> This also touches on CDI-26, which is about providing an embedded mode (API
> for starting CDI) - it covers about 50% of that issue. It doesn't provide a
> bootstrap API, but it does provide a programmatic API to access the
> container:
>
> CDI.current().getBeanManager();
>
> CDI.current().select(MyBean.class).select(new
> MyQualifierLiteral()).doSomething();
>
> (CDI implements Instance)
>
> I've copied the logic for looking up the current CDI instance from the JPA
> Persistence class.
>
> Please review, as I know this addresses two much sought after improvement,
> and I hope that the overall ethos of the approach I've taken you guys like.
> I suspect there are a couple of rough edges to iron out - specifically, I
> would like feedback on:
>
> * what happens when multiple CDI providers are located (right now as I
> straw man I followed JPA's example and returned the first one loaded, not
> sure if this right)
> * Classloading for the providers (Stuart has a comment here)
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regards

Mathieu ANCELIN
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