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From Alex Dean <a...@crackpot.org>
Subject Re: ajax handling fast messages
Date Tue, 14 Dec 2010 18:17:20 GMT
Hi Jeff.  That's great news.  I'm not very Java-savvy, but I've made a few patches to the activemq
ajax code in the past.  I've spent a bit of time lately trying to get junit test cases working
for testing MessageListenerServlet, so I haven't actually made much progress in solving the
issue at hand.  If you've found the error, that's fantastic.  Can you post your patch?

To get a ticket reported, use https://issues.apache.org/jira/secure/CreateIssue!default.jspa.
 You'll need to register before you can open an issue.  If you can attach a patch, I will
happily contribute to the testing effort.

alex

On Dec 14, 2010, at 10:48 AM, Jeff Rose wrote:

> Hi Alex,
>  Thanks for the response.  We looked into it a bit more based on your
> suggestion, and we discovered that there is an error occurring when the
> continuation is resumed in onMessageAvailable in AjaxListener.java.  It
> looks like this onMessageAvailable handler is being called every time a new
> message arrives on the queue, and then it is trying to resume a continuation
> that has already been resumed, which causes an illegal state exception.
> We've been trying to fix the bug  by checking first:
> 
>   !continuation.isResumed()
> 
> but we are still getting the error occasionally (although it does often get
> all of the messages now).  This seems to be a pretty fundamental bug in the
> AJAX support of ActiveMQ.  Definitely worth posting a ticket (although I
> don't know where that is done).
> 
> -Jeff
> 
> 
> On Fri, Dec 10, 2010 at 6:33 PM, Alex Dean <alex@crackpot.org> wrote:
> 
>> 
>> On Dec 10, 2010, at 11:06 AM, Jeff Rose wrote:
>> 
>>> Hi,
>>> Based on the ajax chat example I've put together a small test page to
>>> display messages that I post to a topic or queue using a php script.
>> When I
>>> send 10 messages in a for loop from PHP then the ajax handler is only
>>> getting called with a couple of the messages though.  Looking at ActiveMQ
>>> with jconsole I can see that all of the messages are getting taken off
>> the
>>> queue, but they don't all get to the browser.  Do I need to do something
>>> special in order to make sure I get all of the messages?
>>> 
>>> The relevant code is posted below.  Any thoughts or advice would be
>>> appreciated.
>> 
>> I've noticed the same issue recently.  If I publish 5 messages via a
>> ruby+stomp publisher, I receive all 5 in a ruby+stomp consumer, but I only
>> see 1 message in a javascript/ajax consumer. The <ajax-response> XML element
>> always has only a single <response> element.  (I can see this in Firebug.)
>> The admin webapp shows that all my messages are being de-queued, so I think
>> the ajax servlet is picking up the messages but failing to deliver them to
>> the browser.
>> 
>> Just this morning I was poking around in the code trying to see what's
>> going on.  I have a guess it's in MessageListenterServelet.doMessages().
>> There's some code in there which should put multiple <response> elements
>> into a single <ajax-response>, but it's not happening for some reason.
>> 
>> Maybe we should open a ticket for this?
>> 
>> alex


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