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https://issues.apache.org/jira/browse/POLYGENE-295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16413433#comment-16413433
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Niclas Hedhman commented on POLYGENE-295:
-----------------------------------------
Ok, part one of the puzzle; I have not learned that Activation and activate()
is not used for services, but ServiceActivation and activateService()... No
idea why this distinction exists.
Second part of the puzzle is that the Composite Type must be a subtype of
ServiceActivation, not only the Mixin. That is potentially totally bonkers, and
requires ServiceActivation.class to be added as a Type during assembly, in
cases where an alternative Mixin implementation needs activation. No idea why
this requirement exist. There has been discussion on list on this topic, and
there might even be additional Jira issue on it.
> Activation broken
> -----------------
>
> Key: POLYGENE-295
> URL: https://issues.apache.org/jira/browse/POLYGENE-295
> Project: Polygene
> Issue Type: Bug
> Affects Versions: 2.0, 2.1, 3.0.0
> Reporter: Niclas Hedhman
> Priority: Major
>
> It is quite possible to get service calls before the activate() method has
> been called. For instance, inject a Service into the constructor of an Object
> and call objectFactory.newObject(). Even if instantiateOnStartup(), the
> activation is not called first.
> On top of that, we have a general issue that the bootstrap code is not really
> thread-safe (no effort was made on that), and lazy-initialization may cause
> model corruption due to that, which kind of ties in with the Activation
> system. I suspect that the above problem is some kind of mixing of concerns
> and it gets messed up what is supposed to have happened already.
> Step 1; Fix that activation is ALWAYS called before method calls.
> Step 2; Discuss how to deal with lazy initialization. Either make sure that
> everything in Core Runtime is thread-safe, or drop the current lazy
> initialization, and possibly replace with a Concern instead (which intercepts
> the activate() call, and make that happen upon next method call to the
> service. That seems to be a lot more straight forward and also inline with
> Polygene principles (eat your own dog food).
>
>
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