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https://issues.apache.org/jira/browse/SLING-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14521668#comment-14521668
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Stefan Egli commented on SLING-4685:
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{{discovery.commons.providers}} ?
> Introduce generic discovery.commons.ViewStateManager sharable for impls
> -----------------------------------------------------------------------
>
> Key: SLING-4685
> URL: https://issues.apache.org/jira/browse/SLING-4685
> Project: Sling
> Issue Type: Improvement
> Components: Extensions
> Reporter: Stefan Egli
> Assignee: Stefan Egli
> Fix For: Discovery Commons 1.0.0
>
> Attachments: SLING-4685.patch
>
>
> With multiple discovery implementations existing/upcoming it starts to become
> valuable to share code that can be shared. And with the introduction of
> discovery.commons we have a nice place for this.
> As a first thing, I propose to introduce a discovery.commons.ViewStateManager
> (the name can be changed if wished of course): this one is capable of
> managing a number of TopologyChangeListeners, can be in deactivated/activated
> state and can react on {{handleChanging}} and {{handleNewView}} events and
> translates all of those to correct events that it sends to the registered
> listeners accordingly.
> This also takes into account the fact that the TOPOLOGY_INIT should be sent
> only when the first valid view is available - which is flagged to
> ViewStateManager via {{handleNewView}}.
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