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https://issues.apache.org/jira/browse/SOLR-13400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson updated SOLR-13400:
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    Attachment: SOLR-13400.patch

> Replace Obeservable 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
>         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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