[GitHub] [activemq-artemis] franz1981 commented on a change in pull request #2703: ARTEMIS-2380 Fix delivering message in the case of consume close

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franz1981 commented on a change in pull request #2703: ARTEMIS-2380 Fix delivering message in the case of consume close
URL: https://github.com/apache/activemq-artemis/pull/2703#discussion_r310339975
 
 

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 File path: artemis-server/src/main/java/org/apache/activemq/artemis/core/server/impl/QueueImpl.java
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 @@ -1175,6 +1179,17 @@ public void addConsumer(final Consumer consumer) throws Exception {
 
    }
 
+   @Override
+   public void addLingerRef(Consumer consumer, MessageReference lingerRef) throws Exception {
+      lingerRef.emptyConsumerID();
+      lingerRefMap.put(lingerRef, consumer);
 
 Review comment:
   Beware putting `MessageReference` into a `Map`: `MessageReferenceImpl::hashCode` relies on `getMessage().hashCode()` and `CoreMessage::hashCode` will use the native hash code (like `java.lang.System#identityHashCode`).
   It is known that it would break biased locking optimization on it (see https://blogs.oracle.com/dave/biased-locking-in-hotspot for more detail): given that `CoreMessage` heavily relies on `synchronized` operation, I would suggest to measure the perf impact of it first :+1: 

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