[cdi-dev] Fwd: Correct way to programatically instantiate a Bean

[Todor Boev]

Including CDI-DEV

---------- Forwarded message ----------
From: Todor Boev <rinsvind at gmail.com>
Date: Fri, Sep 8, 2017 at 11:03 AM
Subject: Re: [cdi-dev] Correct way to programatically instantiate a Bean
To: Matej Novotny <manovotn at redhat.com>


Hi Matej,

I am struggling to understand what do you mean by "bean".
The Bean<T> object that produces objects of type T, or each individual
object of type T?

If it is the T this should be the first of my code snippets: a new
CreationalContext for every new T.
If it is the Bean<T> this should be the second of my code snippets: one
CreationalContext all new T.

Regards,
Todor

On Fri, Sep 8, 2017 at 8:42 AM, Matej Novotny <manovotn at redhat.com> wrote:

> Hi Todor,
>
> if I am not mistaken, the CreationalContext is a way to bind
> dependent instances to bean (and so align their lifecycles).
>
> Which means I'd use new CreationalContext for each bean.
>
> Matej
>
> ----- Original Message -----
> > From: "Todor Boev" <rinsvind at gmail.com>
> > To: cdi-dev at lists.jboss.org
> > Sent: Thursday, September 7, 2017 5:07:35 PM
> > Subject: [cdi-dev] Correct way to programatically instantiate a Bean
> >
> > Hello,
> >
> > I need to create beans from a portable extension.
> > It is not clear to me if every instance of a bean must have an associated
> > instance of CreationalContext or rather one CreationalContext must be
> used
> > for all instances:
> >
> > // Store a CreationalContext per bean instance
> > BeanManager manager = ...
> > Bean<T> bean = ...
> > Context ctx = manager.getContext(bean.getScope());
> >
> > Map<T, CreationalContext<T>> dependents = ...
> >
> > public T createBean() {
> > CreationalContext<T> cctx = manager.createCreationalContext(bean);
> > T instance = ctx.get(bean, cctx);
> > dependents.put(instance, cctx);
> > return instance;
> > }
> >
> > public void destroyBean(T instance) {
> > dependents.computeIfPresent(instance, (inst, cctx) -> {
> > bean.destroy(inst, cctx);
> > return null;
> > });
> > }
> >
> > // CDI tracks dependents for me
> > BeanManager manager = ...
> > Bean<T> bean = ...
> > Context ctx = manager.getContext(bean.getScope());
> > CreationalContext cctx = manager.createCreationalContext(bean);
> >
> > public T createBean() {
> > T instance = ctx.get(bean, cctx);
> > return instance;
> > }
> >
> > public void destroyBean(T instance) {
> > bean.destroy(instance, cctx);
> > }
> >
> > Best Regards,
> > Todor
> >
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