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https://issues.apache.org/jira/browse/POLYGENE-129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884741#comment-15884741
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Paul Merlin commented on POLYGENE-129:
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{{Initializable}} has a single {{initialize()}} method, called on fragment
instantiation ; the {{@PostConstruct}} semantic apply well here.
{{Lifecycle}} has {{create()}} and {{remove()}} methods, called respectively
on *entities* creation and removal from UoW ; {{@PostConstruct}} and
{{@PreDestroy}} semantic apply well here too.
{{@PreDestroy}} on a fragment would be ignored if not part of an entity
{{Activation}} has {{activate()}} and {{passivate()}} methods ; the semantic
here is that a passivated service can be reactivated ; {{@PreDestroy}} sounds a
bit aggressive in this context and {{@PostConstruct}} doesn't make sense for
re-activation that happens on an existing instance.
We should definitely replace {{Lifecycle}} and {{Initializable}} with these
annotations.
I'm not sure about {{Activation}}, mostly because of semantics, any thoughts?
> @PreDestroy and @PostConstruct in lieu of initializable and service
> activation
> -------------------------------------------------------------------------------
>
> Key: POLYGENE-129
> URL: https://issues.apache.org/jira/browse/POLYGENE-129
> Project: Polygene
> Issue Type: Improvement
> Reporter: Niclas Hedhman
>
> Kent wrote on mailing list;
> {quote}
> I agree that the mix and match between composites and mixin declarations of
> the same @Activators concept might lead to confusion - not a good idea.
> But a whole new thought .... aren't we reinventing the wheel here.
> We have Initializable interface - declaring a method (on the mixin) invoked
> after construction. We have ServiceActivation - with 2 initialize/destroy
> methods implemented by a mixin - and sort of referenced from the declarations
> on the composites.
> We have @Activators -- that may be declared on the composite - with wide
> flexibility implementation-wise.
> But .... the JDK already has @PostConstruct and @PreDestroy annotations.
> These were originally JEE stuff, but have been in the JDK for several years.
> And it is the same thing! Keeping a special Initializable interface is,
> frankly, a quite dated way of doing stuff.
> I would say we should add support for declaring @PostConstruct and
> @PreDestroy on Mixins - and support for @PostConstruct on plain objects
> (instantiated by ObjectFactory). And simply remove (or just deprecate)
> Initializable and ServiceActivation alltogether.
> I am more uncertain whether the @Activators should be kept or not. On one
> hand I cannot find a single usage in the whole codebase using
> beforeActivation and afterPassivation - so not sure anyone would miss those
> features.
> On the other hand it might be handy to be able to reuse the same activation
> logic across several composites - And there could be some potential of
> reusing the Activator as a listener for UnitOfWork activation/passivation
> instead of module activation/passivation. The afterPassivation could have
> some usages in that context.
> So I think we should keep that concept for now.
> {quote}
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