[cdi-dev] Fwd: [jsr338-experts] Integration of EntityListeners Classes with CDI (Java EE 7)

[Jens Schumann]

Pete:

> Instead, I would propose that EntityListeners are simply added to
> the list of Java EE components which are able to be injected. This
> means they can be injected, but are not available for injection into
> other components.


Maybe I don't understand this because I am not a native English speaker;).

Will your proposal support something like this:

public class ModificationListener {

 @Inject
 @Current
 private User user;

 @PrePersist
 public void onCreate(Object obj) {
  if (obj instanceof ModifiableObject) {
    // make use of current user
  }
 }
}

Right now I have use the BeanManager within the listener to achieve the
same result. Pretty inconvenient.

Jens





On 21.06.11 15:54 "Pete Muir" <pmuir at bleepbleep.org.uk> wrote:

>FYI
>
>Begin forwarded message:
>
>> From: Pete Muir <pmuir at redhat.com>
>> Date: 21 June 2011 14:53:57 GMT+01:00
>> To: Werner Keil <werner.keil at gmail.com>
>> Cc: users at javaee-spec.java.net
>> Subject: Re: [jsr338-experts] Integration of EntityListeners Classes
>>with CDI (Java EE 7)
>> 
>> Thanks Werner. I'll forward to the CDI EG (address is
>>cdi-dev at lists.jboss.org).
>> 
>> I don't think you should be able to make an EntityListener into a bean,
>>as the listener is stateless, there is little point in being able to
>>inject it into another bean. Instead, I would propose that
>>EntityListeners are simply added to the list of Java EE components which
>>are able to be injected. This means they can be injected, but are not
>>available for injection into other components.
>> 
>> On 21 Jun 2011, at 14:48, Werner Keil wrote:
>> 
>>> Forwarding it to other aliases and Pete (although there must be a CDI
>>>1.1 alias by now, too<347.gif>)
>>> 
>>> ---------- Forwarded message ----------
>>> From: Adam Bien <abien at adam-bien.com>
>>> Date: Tue, Jun 21, 2011 at 5:48 PM
>>> Subject: [jsr338-experts] Integration of EntityListeners Classes with
>>>CDI (Java EE 7)
>>> To: jsr338-experts at jpa-spec.java.net
>>> 
>>> 
>>> Hi *
>>> 
>>> EntityListeners should be integrated with CDI / EJB 3.2. It means:
>>>Java EE 7 DI should work in EntityListener classes. An EntityListener
>>>could be annotated with @Singleton / @Stateless / @RequestScoped etc.
>>>(everything what is stateless)
>>> 
>>> We should extend the sentence: "Entity listeners are stateless. The
>>>lifecycle of an entity listener is unspecified" at the page 95 of the
>>>Expert Group Draft 2. to "The lifecycle of an entity listener is
>>>unspecified in unmanaged environments. An EJB 3.2 @Stateless,
>>>@Singleton or CDI managed bean can also receive callback events",
>>> 
>>> What do you think?
>>> 
>>> adam
>>> 
>>> 
>>> 
>>> -- 
>>> Werner Keil | UOMo Lead | Eclipse Foundation | Agile Coach, Principal
>>>Consultant | emergn limited
>>> 590 Madison Avenue. New York. NY 10022 | 68 Lombard Street. London
>>>EC3V 9LJ UK
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>>>IT
>>> 
>> 
>
>
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