Github user franz1981 commented on the pull request:
https://github.com/apache/activemq-artemis/commit/dfa70680fed37d25aa3a6d0d6a0795e580495b6a#commitcomment-31769915
No need to synchronize it: `stores` is a concurrent hashmap and you can use
the atomic `computeIfAbsent` that use a lambda to populate the map---
