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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