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From cppdeveloper <turtle...@gmail.com>
Subject Re: connection->start() or connection->createSession() hangs when trying to connect ActiveMQ-CPP client with OpenMQ broker via STOMP
Date Wed, 18 Aug 2010 18:22:47 GMT

That makes sense- being new to JMS in general, that will be really help on
the Wiki. Thanks. 

I'll be configuring ActiveMQ with ActiveMQ-CPP in Glassfish, so I can use
openwire which I read is more reliable and has more capabilities anyway. 

Thanks!


Timothy Bish wrote:
> 
> On Wed, 2010-08-18 at 09:16 -0700, cppdeveloper wrote:
>> Failover is crucial, so I will have to use my backup method, which is
>> converting the broker cluster from OpenMQ to ActiveMQ 5, but it still
>> needs
>> to work in Glassfish V2.
>> 
>> FYI I have done some pretty thorough research on OpenMQ and
>> ActiveMQ/ActiveMQ-CPP about STOMP and failover and I never saw it written
>> anywhere that both would not be supported simultaneously. It would
>> probably
>> be a good idea to write that somewhere so people don't spend days trying
>> to
>> configure something that will never work anyways. 
> 
> I updated the Wiki to reflect the advice not to combine Stomp and
> Failover.  
> 
> Stomp is a pretty basic protocol and as such there are limits to what
> can be done with it, you could implement some basic failover using the
> current v1.0 spec in ActiveMQ-CPP but it would have its limits.  Until
> the v1.1 Stomp spec is ratified its hard to detect in most cases that
> the tcp connection has been broken as there are no KeepAlive messages
> between broker and client.  
> 
>> 
>> Thanks for the heads up. 
>> 
>> 
>> Timothy Bish wrote:
>> > 
>> > On Wed, 2010-08-18 at 08:35 -0700, cppdeveloper wrote:
>> >> 
>> >> 
>> >> Timothy Bish wrote:
>> >> > 
>> >> > Can you add some code to dump the contents of the Response frame
>> sent
>> >> > from OpenMQ?  This would help me understand why its not being
>> >> > processed.  
>> >> > 
>> >> 
>> >> According to an OpenMQ developer, he thought the problem may be this:
>> >> 
>> >> "IIRC the Stomp frames in OpenMQ always use a content-length header
>> while
>> >> ActiveMQ uses this header for binary messages only, and uses a null
>> byte
>> >> terminator for text messages.
>> >> So I think that the ActiveMQ Stomp library times out because if waits
>> for
>> >> the null byte, which never is sent from the OpenMQ broker.
>> >> Hope this helps,
>> >> Michael"
>> >> 
>> >> Other than adjusting the output from the OpenMQ broker, is there any
>> way
>> >> to
>> >> change how the ActiveMQ-CPP client handles this? 
>> > 
>> > Since its hanging during the Connect phase then the content-length
>> > property wouldn't come into play here since you aren't at the point of
>> > even sending or receive Stomp Send / Message Frames, the exchange at
>> > this point would either be the Connect / Connected exchange or a
>> > Subscribe if you are getting to the point of actually creating a
>> > Consumer.
>> > 
>> > The content-length is optional in Stomp 1.0 for Send / Message frames
>> > and the frame must end in a newline either way so in that regards
>> AMQCPP
>> > is stomp compliant.  
>> > 
>> >> 
>> >> 
>> >> Timothy Bish wrote:
>> >> > 
>> >> > Can I ask why you need to use ActiveMQ-CPP to talk stomp to OpenMQ,
>> >> > don't they have a C client for OpenMQ?
>> >> > 
>> >> 
>> >> We already have an exisitng broker cluster of OpenMQ brokers, and we
>> need
>> >> a
>> >> C++ client to interact with them, but we also need it to use failover,
>> >> which
>> >> their C client does not. Thus far, ActiveMQ-CPP has seemed like the
>> best
>> >> open source option, if they could connect/communicate correctly!
>> >> 
>> > 
>> > You won't be able to use the Failover Transport with the Stomp
>> transport
>> > as Stomp doesn't support a reliability mechanism for connection
>> > monitoring nor does it allow for subscription recovery so the Failover
>> > support in AMQCPP isn't going to work when you are connected to Stomp.
>> > 
>> > 
>> > Regards
>> > 
>> > 
>> > -- 
>> > Tim Bish
>> > 
>> > Open Source Integration: http://fusesource.com
>> > ActiveMQ in Action: http://www.manning.com/snyder/
>> > 
>> > Follow me on Twitter: http://twitter.com/tabish121
>> > My Blog: http://timbish.blogspot.com/
>> > 
>> > 
>> > 
>> 
> 
> 
> 
> 

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