[cdi-dev] inheritance of cdi scopes
reza_rahman at lycos.com
Sun Mar 6 10:40:53 EST 2016
Can you kindly share an annotated code example of the proposed solution so we can all follow and discuss this?
> On Mar 6, 2016, at 9:31 AM, Romain Manni-Bucau <rmannibucau at gmail.com> wroteshar:
> Hi guys,
> spoke on concurrency utilities about the ability to inherit a cdi scope. Idea is to follow request scope more than cdi spec allows. First thought it was a concurrency utilities thing but Reza mentionned can be a CDI one so here it is.
> In a servlet i get MyBean which is @RequestScoped, I do some set on it. The i go async (AsyncContext) and trigger a task in another thread. It would be neat - and mandatory in some case by the loose coupling nature of CDI - to get the *same* MyBean *instance* in this thread. With a direct dependency you can easily use message passing pattern - but you loose the loose coupling cause you need to know until which level you unwrap, think t principal case which has 2-3 proxies!. However in practice you have a lot of undirect dependencies, in particular with enterprise concerns (auditing, security...) so you can't really do it easily/naturally.
> One very verbose way is to be able to kind of push/pop an existing context in a thread - wrappers doing it on a Runnable/Consumer/Function/... would be neat.
> Would CDI handle it in 2.0?
> Side note: this is really about the fact to reuse a "context context" (its current instances map) in another thread the more transparently possible and match the user vision more than a technical question for now.
> Romain Manni-Bucau
> @rmannibucau | Blog | Github | LinkedIn | Tomitriber
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