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From jule <julian.qui...@gmail.com>
Subject Re: Beginner problem: Too many consumers on queue after browser restart...
Date Fri, 08 Oct 2010 21:03:41 GMT

Thanks for pointing that out, Alex. As I was not able to compile and run a
source version with the patch you mentioned applied, I´ll stay with this
"solution". My application is not in production yet.

I am looking forward to see your patch (hopefully) in the next release of
ActiveMQ. 

Thank you for your contributions.


Alex Dean-2 wrote:
> 
> 
> On Oct 8, 2010, at 5:09 AM, jule wrote:
> 
>> 
>> I found a (quite obvious) solution to this problem. I just added a call
>> to
>> removeListener() of amq.js just before adding my listener on startup,
>> like
>> so:
>> 
>> amq.removeListener(id, destination);
>> amq.addListener(id, destination, callBack);
>> 
>> Now it works perfectly fine for me. Maybe this should be included in the
>> Getting Started document as that would have saved me quite a bit of time.
> 
> I think you've still got a race condition to contend with.  If both your
> removeListener POST and your addListener POST return before the first
> polling GET (triggered by amq.init()) times out, you'll end up with your
> subscriptions (from addListener) in a different JSESSIONID than your
> polls, and you'll never receive messages.
> 
> The solution we've implemented is to do an initial poll with a very short
> timeout.  We don't send any addListener calls to the server until this
> inital poll has returned, so they always end up in the same session.  We
> did this by allowing amq.init() to accept a configuration option called
> sessionInitializedCallback.  addListener calls go in this callback.
> 
> We're just waiting on AMQ-2948 before submitting this patch.
> 
> alex
> 
> 
> 
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