The polling begins as soon as the page is loaded and the _amq.js fle is
processed. It is quite probable that their are no consumers at this time. A
consumer isn't created until the amq.addListener() function is invoked.
Can you post your code?
-- jim
JigarP wrote:
>
> Hi Chago,
> I had checked out whole activemq +ajax forum and i had found the same
> issue related question posted but they where not having any reply for
> that. I think whn polling happens then it does not have any consumer so it
> is not goin inside for loop itself.
>
> can you tell me if you can help me out for this. or suggest alternate
> solution for this.
>
> J
>
>
> chago wrote:
>>
>> Unfortunately, I am familiar only with the javascript client portion of
>> the puzzle. The MessageListenerServlet itself is the entity that
>> establishes the JMS connection with the broker. (Hope my terminology is
>> correct there.) The servlet acts as a pass-through proxy to the
>> javascript client. If you are seeing this servlet drop connections to the
>> broker, it should show up using detailed logging.
>>
>> Which condition in doMessages is failing?
>> - is there at least one consumer?
>> - does consumer.getAvailableListener() return a value?
>>
>> In subversion, there doesn't appear to be many changes in the early part
>> of the doMessages() method. Would you be able to include the
>> avtivemq-web.jar file from the head in your project to replace the 4.x
>> version. There may be other dependencies that prevent this, but I have
>> never tried.
>>
>> -- jim
>>
>> -- jim
>>
>>
>> JigarP wrote:
>>>
>>> Hi Chago/James,
>>>
>>> you are right. I had same problem and because of this i am not able
>>> to use latest tech. provided by Activemq and jetty(Continuation). I am
>>> facing only one issue that is whenever client do polling that time i am
>>> not getting any consumer for that client so even if we have data in the
>>> Activemq we are not able to get it.
>>>
>>> Below is my observation.
>>>
>>> we found that activemq is having all the messages but AjaxServlet is not
>>> able to get because whenever we do polling from client then it checks
>>> for below condition in the
>>>
>>>
>>> MessageListenerServlet.java class(inside activemq-web.jar) which is
>>> having below implementation.
>>>
>>>
>>> //inside
>>> doMessages method
>>>
>>> for (int i = 0; message == null && i <
>>> consumers.size(); i++) {
>>> consumer = (MessageAvailableConsumer)consumers.get(i);
>>>
>>> if (consumer.getAvailableListener() == null) {
>>> continue;
>>>
>>> }
>>>
>>>
>>> // Look for any available messages
>>>
>>> message = consumer.receiveNoWait();
>>> if (LOG.isDebugEnabled()) {
>>>
>>> LOG.debug("received " + message + " from " +
>>> consumer);
>>>
>>> }
>>> }
>>>
>>>
>>> above implementation will read message from activemq for corresponding
>>> consumer. but we found that
>>> we are not having any consumer related to client so even if we have data
>>> in the activemq we are not
>>> able to send that data back to client.
>>>
>>>
>>> I dont know how to keep live consumer so that we can execute above logic
>>> and we can get messages.
>>>
>>> is this bug or do i need more configuration to resolve this isssue.
>>>
>>>
>>>
>>> J
>>>
>>> chago wrote:
>>>>
>>>> I know others that have had this problem running with the 4.1.x series.
>>>> Is that the case for you?
>>>>
>>>> -- jim
>>>>
>>>>
>>>> JigarP wrote:
>>>>>
>>>>> Hi ,
>>>>>
>>>>> I am using ActiveMQ/AJAX for my web based application. I have
>>>>> integrated ajax successfully in my application but getting below issue
>>>>> sometime.
>>>>>
>>>>> 1) I send message to MQ but not getting reply to client browser but
>>>>> other browsers are getting reply who are registered for same topic.
>>>>>
>>>>> 2) is there any way to check whether our listener is listening to
>>>>> topic?if not connected so we can retry and connect so we will not miss
>>>>> any message.
>>>>>
>>>>> 3) i am not able to make stable my application because of above
>>>>> issue. can you suggest some technique for ajax with activemq so i can
>>>>> try out.
>>>>>
>>>>> awaiting your reply,
>>>>>
>>>>> Jigar
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>
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