[jira] [Resolved] (SOLR-13400) Replace Observable pattern in TransientSolrCoreCache

["Erick Erickson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-13400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Erick Erickson resolved SOLR-13400.
-----------------------------------
    Resolution: Fixed

> 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-13400-8x.patch, SOLR-13400-master.patch, 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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