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https://issues.apache.org/jira/browse/SOLR-13400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820779#comment-16820779
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Uwe Schindler commented on SOLR-13400:
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Hi,
no I did not add this to any branch. On master it still has the code as before,
just with out "own" Observable, so the patch should apply with some minor
midifications, but you still have to remove some code.
IMHO: I'd apply the patch to branch 8.x and then just copy over the files to
master and review the differences :-) That's way easier. Don't forget to remove
the extra class in master!
I can take care of that if you want.
> Replace Observable pattern in TransientSolrCoreCache
> ----------------------------------------------------
>
> Key: SOLR-13400
> URL: https://issues.apache.org/jira/browse/SOLR-13400
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server, SolrCloud
> Affects Versions: 8.0, master (9.0)
> Reporter: Uwe Schindler
> Assignee: Erick Erickson
> Priority: Major
> Fix For: 8.1, master (9.0)
>
> Attachments: SOLR-13400.patch
>
>
> Due to change to Java 11 as minimum version (LUCENE-8738), the usage of the
> old java.utilObservable pattern is deprecated and cannot be used anymore in
> Lucene/Solr.
> LUCENE-8738 added a rewritten, more type-safe oimplementation of the observer
> pattern, but it looks like the is overengenieered. As there is only one
> listener registered, it would be enough to just call the method on SolrCores
> class (pkg-protected). On LUCENE-8738, [~erickerickson] suggested to move the
> callback method to queue closes of core in CoreContainer instead, so all the
> abstractions can be removed.
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