Uwe Schindler created SOLR-13400:
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             Summary: 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


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, Erick 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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