[cdi-dev] JMS 2.1: Proposal to allow any CDI managed bean in a Java EE application to listen for JMS messages

[Romain Manni-Bucau]

2015-08-25 17:31 GMT+02:00 John D. Ament <john.d.ament at gmail.com>:

>
>
> On Tue, Aug 25, 2015 at 9:51 AM Nigel Deakin <nigel.deakin at oracle.com>
> wrote:
>
>> On 24/08/2015 21:24, John D. Ament wrote:
>> >
>> > Hi Nigel!
>> >
>> > Glad to hear from you.  Was wondering, is there a way to manually
>> register listeners?
>>
>> The current proposal is is for the bean to start listening just as soon
>> as it is created (by CDI), and for it to stop
>> listening just before it is destroyed (by CDI).
>>
>> As you suggesting that CDI would create the listener, but the application
>> would call some method to tell it to start
>> listening? or did you have something else in mind?
>>
>
>
> Hmm, this would mean that only app scoped beans would apply?
> It might be better to scan for the annotations and use that to start up
> the listener?
>
>

Does it mean anything to have a request scope or session scope listener? I
see technically how it can be done but I dont see any case needing it but I
feel it can hurt a lot to support it for anything else than PoC - ie in
prod, no?


>
>>  > It would be great if this could
>> > be leveraged in a CDI SE environment as well as EE environment.
>>
>> I see that work is underway for CDI 2.0 to define how CDI might work in a
>> Java SE environment. I don't see why a similar
>> portable extension could not be created for use in Java SE. Since there
>> would be no need to support Java EE behaviour
>> such as transactions this could be built directly on top of the JMS
>> provider's Java SE client. No need to use a resource
>> adapter. However since the @JMSListener and @JMSConnectionFactory
>> annotations use JNDI there would be a need to be a way
>> to specify which JNDI InitialContext to use. I'm not proposing any of
>> this at the moment, but it might perhaps be
>> something that we (the JMS expert group) could consider later on as a
>> optional part of JMS 2.1.
>>
>> There's also the Java EE application client to consider.
>>
>> Nigel
>>
>>
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