[cdi-dev] Concurrency Control

[Reza Rahman]

We've discussed this issue before. I definitely still think @Lock 
belongs in a modular CDI specification. It would be highly useful to 
both @Singleton and @ApplicationScoped. Today if I need to use 
declarative concurrency control for a shared component I am essentially 
forced to use EJB singleton - which shouldn't be the case and perhaps 
should not have been the case past Java EE 6.

On 2/19/2016 5:27 AM, Stephan Knitelius wrote:
> Hi all,
>
> CDI spec does not define a common concurrency control mechanism. The 
> time any type of concurrency control is mentioned is in conjunction 
> with EJB and a rather restrictive one for conversation context.
>
> CDI Spec:
> The container ensures that a long-running conversation may be 
> associated with at most one request at a time, by blocking or 
> rejecting concurrent requests. If the container rejects a request, it 
> must associate the request with a new transient conversation and throw 
> an exception of type|javax.enterprise.context.BusyConversationException|.
>
>
> It would be helpful if a common configurable concurrency mechanism 
> (EJB Singleton style locking?) could be established for all normal 
> scopes.
>
> What are your thoughts on this?
>
> Regards,
>
> Stephan
>
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> ______________________________________
> *Stephan Knitelius*
> Alteburger Str. 274
> 50968 Köln / Cologne
> Deutschland / Germany
> stephan at knitelius.com <mailto:stephan at knitelius.com>
>
>
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