[jira] Commented: (CAMEL-1336) Full support for async messaging and correlation

["Claus Ibsen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/activemq/browse/CAMEL-1336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55358#action_55358 ] 

Claus Ibsen commented on CAMEL-1336:
------------------------------------

See CAMEL-2151 which has the base stuff in the camel-core for components which supports async request/reply can leverage.



> Full support for async messaging and correlation
> ------------------------------------------------
>
>                 Key: CAMEL-1336
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-1336
>             Project: Apache 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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