[jira] [Resolved] (SLING-4685) Introduce generic discovery.commons.ViewStateManager sharable for impls

["Stefan Egli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SLING-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Egli resolved SLING-4685.
--------------------------------
    Resolution: Fixed

implemented in http://svn.apache.org/r1677574
/cc [~marett], [~cziegeler]

> 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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