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https://issues.apache.org/jira/browse/CAMEL-5390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on CAMEL-5390 started by Raul Kripalani.
> Option to assign unique correlation ID to JMS messages
> ------------------------------------------------------
>
> Key: CAMEL-5390
> URL: https://issues.apache.org/jira/browse/CAMEL-5390
> Project: Camel
> Issue Type: Improvement
> Components: camel-activemq
> Affects Versions: 2.10.0
> Reporter: Raul Kripalani
> Assignee: Raul Kripalani
>
> Imagine a sequential JMS invocation across Camel routes, such as the
> following:
> {code}
> <route>
> <from uri="timer:foo?fixedRate=true&period=10000" />
> <inOut uri="activemq:queue:test1" />
> <inOut uri="activemq:queue:test2" />
> </route>
> {code}
> The camel-jms consumer listening on test1 will set the {{JMSCorrelationID}}
> header to the {{JMSMessageID}} for that exchange.
> When the response returns to the route and sent to test2, this consumer also
> uses the *same* {{JMSCorrelationID}} as before.
> IMHO, this behaviour is incorrect from the pragmatic perspective. Why should
> test2 reuse the Message ID from test1 after all?
> Despite that, the correlation works for simple cases, but for complex routing
> with parallel JMS exchanges, it doesn't because the correlation ID is not
> unique for each exchange. Consider the following splitter:
> \\
> {code}
> <route>
> <from uri="timer:foo?fixedRate=true&period=10000" />
> <setBody><constant>1,2,3,4,5</constant></setBody>
> <inOut uri="activemq:queue:test1" />
> <split parallelProcessing="true">
> <tokenize token="," />
> <inOut uri="activemq:queue:test2" />
> </split>
> <to uri="log:Finished?showAll=true" />
> </route>
>
> <route>
> <from uri="activemq:queue:test1" />
> <to uri="log:Received?showAll=true" />
> </route>
>
> <route>
> <from uri="activemq:queue:test2" />
> <to uri="log:Received?showAll=true" />
> <setBody><constant>reply</constant></setBody>
> <delay><constant>100</constant></delay>
> </route>
> {code}
> There are several solutions here:
> # Remove the JMSCorrelationID header before each request to test2
> # Enable the useMessageIDAsCorrelationID option on both producer and consumer
> endpoints
> # Create a new option to assign a unique ID to the JMSCorrelationID header
> The downside of 2 is that the message ID is only assigned after the JMS
> dispatch, so the component updates the correlation map with the final
> JMSMessageID after the JMS dispatch. Also, camel-jms is also prepared to
> handle cases where the reply comes in before the map update has occurred, by
> waiting 5 seconds if an unknown correlation ID is received, blocking the
> receipt of any further replies. You will agree with me this is inefficient
> and flaky for enterprise deployments.
> That's where the upside of 3 lies. By expressly setting a static unique ID as
> the correlation ID, we get rid of these race conditions and inefficiencies.
> I propose calling this option 'assignUniqueCorrelationID'.
> I'm happy to submit a patch for this, targeting 2.10.1.
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