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https://issues.apache.org/jira/browse/QPID-8554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17402861#comment-17402861
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Alex Rudyy commented on QPID-8554:
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Hi [~lacam],
Could you please provide more details on conditions when the reported issue
manifest?
IMHO, the loop should eventually ends after the updating the CACHE_UPDATE.
> [Broker-J] Infinite loop in CachingSecurityToken class
> ------------------------------------------------------
>
> Key: QPID-8554
> URL: https://issues.apache.org/jira/browse/QPID-8554
> Project: Qpid
> Issue Type: Bug
> Components: Broker-J
> Reporter: Marek Laca
> Priority: Minor
> Labels: Broker, Java, thread-safe
>
> The CachingSecurityToken class is caching the authorization results. It can
> be utilized by multiple threads at the same time. Hence, it has to be
> multi-thread safe. The CachingSecurityToken::authorise could get stuck in an
> infinite loop when multiple threads try to update the local cache
> simultaneously.
> Two threads can be in permanent conflict when each thread is trying to
> override changes of another thread.
> {code:java}
> AccessControlCache cache;
> while((cache = CACHE_UPDATE.get(this)).getAccessControl() !=
> ruleBasedAccessControl)
> {
> CACHE_UPDATE.compareAndSet(this, cache, new
> AccessControlCache(ruleBasedAccessControl));
> }
> {code}
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