[seam-issues] [JBoss JIRA] Created: (SEAMCRON-6) Can we use @RequestScoped for @Asynchronous methods? How?

[Peter Royle (JIRA)]

Can we use @RequestScoped for @Asynchronous methods? How?
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                 Key: SEAMCRON-6
                 URL: https://issues.jboss.org/browse/SEAMCRON-6
             Project: Seam Cron
          Issue Type: Task
            Reporter: Peter Royle
            Assignee: Peter Royle


This is one for investigation some time. It came up in this IRC chat:


IRC Transcript:

[11:10am] johnament: request scoped won't be active in a background thread.
[11:10am] PeteRoyle: ah true cos it's threadlocal?
[11:10am] johnament: which?
[11:11am] PeteRoyle: request scoped implementation
[11:11am] PeteRoyle: won't work in a background thread because the implementation of request scope uses threadlocal, is that right?
[11:11am] johnament: its essentially an HTTP request
[11:12am] PeteRoyle: right
[11:12am] PeteRoyle: I think the use case is valid though, do you agree?
[11:13am] johnament: its valid, but it breaks the CDI model, so to say
[11:13am] johnament: because you want to make your contextual objects available outside of your context
[11:14am] PeteRoyle: right yeah that makes sense
[11:14am] PeteRoyle: the request might be over
[11:14am] johnament: the only thing really available is going to be dependent or application scoped
[11:15am] johnament: the bigger question - which request?
[11:15am] PeteRoyle: well the one from which the @Asynch method was called - assuming we could hang onto it
[11:15am] PeteRoyle: hang onto the request that is
[11:16am] PeteRoyle: eg: a controller which @Injects a @RequestScoped Thing, then calls an @Asynchronous method
[11:17am] johnament: the only way it would work is to make request scope extend through your @asynch process is over.
[11:18am] PeteRoyle: The interceptor would have access to the correct @RequestScope. It would need to replicate it into the new thread. Would that be possible do you think?
[11:18am] johnament: i don't know how plausible/possible that even is.
[11:18am] PeteRoyle: yeah. I might leave that as something for investigation later. I'll JIRA it
[11:18am] johnament: jms does this by transporting the event over JMS, but loses the context.

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