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https://issues.apache.org/jira/browse/QPID-8558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17443628#comment-17443628
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ASF GitHub Bot commented on QPID-8558:
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vavrtom merged pull request #106:
URL: https://github.com/apache/qpid-broker-j/pull/106
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> [Broker-J] Enhancement of sole connection enforcement policy evaluation
> -----------------------------------------------------------------------
>
> Key: QPID-8558
> URL: https://issues.apache.org/jira/browse/QPID-8558
> Project: Qpid
> Issue Type: Improvement
> Components: Broker-J
> Reporter: Marek Laca
> Priority: Minor
> Labels: Broker, Java
>
> Java broker implements the sole connection enforcement policy extension of
> the AMQP 1.0 protocol. The extension ensures that the remote container can
> open only one active connection to the broker at the same time.
> The implementation is ineffective. When a new connection is opened the
> IO-thread transfer the check to the virtual host configuration thread. The
> configuration thread iterates throw all registered connections and checks
> their remote container id and the policy. This technique ensures exclusive
> access to the collection of the connections and nothing can be added or
> removed during the check. Hence, the configuration thread works as a master
> thread and every IO-thread has to wait till it receives a permission to go.
> The waiting time increases with the number of open connections. The
> processing of the messages is degraded, even when the user does not utilize
> the sole connection enforcement policy.
> The policy can be implemented as a connection limiter and there is no need
> for a global lock or the usage of configuration thread. The limiter can check
> the connections from different remote containers in parallel. If user does
> not utilize the sole connection enforcement policy then every connection will
> have a unique container id and the processing of a new incoming connection
> will not be block by another connections.
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