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From "Pete Schwamb (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AMQ-3015) Javascript client does not establish session properly.
Date Thu, 04 Nov 2010 15:48:00 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-3015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pete Schwamb updated AMQ-3015:
------------------------------

    Attachment: amq_session.patch

> Javascript client does not establish session properly.
> ------------------------------------------------------
>
>                 Key: AMQ-3015
>                 URL: https://issues.apache.org/activemq/browse/AMQ-3015
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.4.1
>            Reporter: Pete Schwamb
>         Attachments: amq_session.patch
>
>
> In some configurations, the javascript client (amq.js) is not loaded from the same container
that hosts the activemq broker.  For example, we have a Rails app and ActiveMQ both sitting
behind apache, and the amq.js file is served directly by apache.
> In these kinds of configurations, when the javascript client first calls amq.init(),
there is no JSESSIONID.  Both the POST to establish the subscription and the GET to start
polling are delivered asynchronously, both without a JSESSIONID, and thus they each end up
with different JSESSIONIDS, and the poll never returns any messages (as that session has no
subscription).
> This small patch adds support for a callback mechanism that will allow clients to sign
up using a callback mechanism that ensures that the JESSIONID is established properly before
attempting to make a subscription, like this:
> {code:javascript:title=myclient.js|borderStyle=solid}
> amq.init({ 
>     uri: '/amq',
>     sessionInitializedCallback: function() { 
>         amq.addListener("display", "topic://sensors", onMessage);       
>     } 
> });
> {code}
> The patch is also backwards compatible, so existing code should still work (albeit with
the same existing problem).

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