[GitHub] [kyuubi] pan3793 commented on a diff in pull request #4777: Make EventHandler auto-closeable and de-register all event handlers when stopping server

["pan3793 (via GitHub)" <gi...@apache.org>]

pan3793 commented on code in PR #4777:
URL: https://github.com/apache/kyuubi/pull/4777#discussion_r1178670987


##########
kyuubi-events/src/main/scala/org/apache/kyuubi/events/EventBus.scala:
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@@ -122,5 +133,10 @@ object EventBus extends Logging {
       } yield parent
       clazz :: parents
     }
+
+    def deregisterAll(): Unit = {

Review Comment:
   synchronized



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