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https://issues.apache.org/jira/browse/CAMEL-1336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-1336.
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Resolution: Won't Fix
> Full support for async messaging and correlation
> ------------------------------------------------
>
> Key: CAMEL-1336
> URL: https://issues.apache.org/jira/browse/CAMEL-1336
> Project: Camel
> Issue Type: Improvement
> Components: camel-core
> Affects Versions: 1.5.0
> Reporter: Hadrian Zbarcea
> Assignee: Hadrian Zbarcea
> Fix For: Future
>
>
> This is a feature that has been requested by users a few times, and it's time
> to get addressed.
> Camel does not really support 2x 1-way async messaging. It sorta does in
> camel-jms, by sending a message to a queue and setting the "JMSCorrelationID"
> header. For a ExchangePattern.InOut it immediately waits for a response (up
> to a timeout period) and gets the reply and continues processing.
> There are a few issues with this approach:
> * this mechanism is not available across all camel components. There are
> other camel components that support async 1 way messaging such as file/ftp,
> mail, mina, cxf, etc.
> * there can be no other processing between a message is sent and a reply is
> received.
> * the timeout value is short and keeps resources locked, we cannot have long
> running transactions
> My proposal is to:
> * move the mechanism from jms into core (and improve it)
> * use a correlation mechanism (that will be different for different
> components, such as MessageID in camel-mail) to correlate inputs with
> outputs. The correlation mechanism could be implicit or explicit.
> * provide a storage for pending 2x 1-way async UOWs (multiple options
> available)
> A route would then look something like this:
> {code}
> from("direct.start")
> .setHeader("reply-to", constant("hadrian@localhost; copy@localhost"))
> .correlate(header("Message-ID"))
> .to("smtp://someone@localhost?password=secret&to=otherone@localhost")
> from("pop3://hadrian@localhost?password=secret).correlate(header("Message-ID"))
> .from("some-other-source")
> .aggregate(header("foo")).to("direct:end");
> {code}
> *note*: the multiple from(s).
> * This also gives unlimited time for a reply to be received.
> * I don't think support for acid transactions makes any sense in such case.
> * The presence of correlate() in the pipeline causes automatic storage of the
> uow
> * The presence of correlate() after a from() causes the removal of the uow
> from persistent store.
> Any ideas?
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