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https://issues.apache.org/jira/browse/SLING-2347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178002#comment-13178002
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Felix Meschberger commented on SLING-2347:
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Interesting.
Some notes:
-- You should probably not cast the DEFAULT_FILTER_ACTIVE_PROP property to
boolean - the property might be of another type (e.g. string)
-- I would use the whiteboard pattern: Remove the StartupFilter interface but
keep the ProgressProvider interface top-level. The StartupFilterImpl (probably
rename to StartupFilter after StartupFilter removal) should have a dynamic,
multiple @Reference to ProgressProviders.
Using the whiteboard pattern makes the implementation of the
StartupProgressProvider services simpler (they just register or unregister
without caring whether they are really used or not)
> Startup filter: allow requests to be rejected with a 503 during startup
> -----------------------------------------------------------------------
>
> Key: SLING-2347
> URL: https://issues.apache.org/jira/browse/SLING-2347
> Project: Sling
> Issue Type: New Feature
> Components: Extensions
> Reporter: Bertrand Delacretaz
> Assignee: Bertrand Delacretaz
> Priority: Minor
>
> To provide a clear status during startup, especially when that implies
> automatic application or content upgrades, I have implemented a simple filter
> that causes all Sling requests to return a 503 status until another component
> decides that Sling is ready to accept requests.
> The use case is to start the bundle that contains this filter at start level
> lower than that of the Sling engine, so that the 503 filter kicks in as soon
> as the Sling servlet starts, with a simple API to provide progress
> information (returned in the body of the 503 response) and remove the filter
> when the system is ready.
> I'll add that filter as a new bundle under contrib/extensions.
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