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https://issues.jboss.org/browse/CDI-587?page=com.atlassian.jira.plugin.sy...
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Gordon Hutchison commented on CDI-587:
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The issue of the lifecyle of the RequestScope is touched on in the discussion thread.
For a reactive stream, one can envisage that for a linear graph of
publisher;[processor*];subscriber one could have a simple mental model of propogating
contexts.
However one could also envisage an operator, for example, that passed on the maximum of
every 10 stream elements
- downstream of this, which of the 10 incoming contexts should be propogated? One could
envisage:
1 - provide an API - enabling the Publisher(/Operator) to
select the downstream context as a function of the contexts associated with the onNext
items passed in,
2 - a new context (enabling @RequestScoped beans to be used but not shared with the
'real request,
3 - or a null context (exception if scoped bean injected) or...
3 - one could specify it was the context that was
active when the 'last' of each ten stream elements was processed etc.
What, for example, would be the correct RequestScope downstream of CombineLatest operator
if each operand stream had a valid RequestScope? How would the CombineLatest operator
function
'help' the system provide the correct RequestScope downstream?
https://channel9.msdn.com/Blogs/J.Van.Gogh/Reactive-Extensions-API-in-dep...
A similar situation could be set up using CompletionStage:runAfterBothAsync etc.
Propose a way to propagate an existing context
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Key: CDI-587
URL:
https://issues.jboss.org/browse/CDI-587
Project: CDI Specification Issues
Issue Type: Epic
Components: Contexts
Affects Versions: 1.2.Final
Reporter: Romain Manni-Bucau
The overall idea is to ensure that it is not cause the code becomes
asynchronous/reactive/... that we loose the instances or get another context.
An example is starting an AsyncContext in a servlet.
One proposal is to add a flag to ask for propagation of the context in async managed
threads: @RequestScoped(inherited = true) which would reuse the same instances for these
"new" threads.
Note however this issue is not only bound to servlets even if it is the easiest example.
The original thread disucssion on the list:
http://cdi-development-mailing-list.1064426.n5.nabble.com/RequestScope-Li...
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