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From "James Strachan" <james.strac...@gmail.com>
Subject Re: Order of message consumption across destinations
Date Mon, 19 Mar 2007 23:58:47 GMT
BTW we support optional total ordering to ensure that all consumers on
a topic see the same order (which is slower as we have to synchronize
the processing of the processors in the broker)

On 3/19/07, James Strachan <james.strachan@gmail.com> wrote:
> ActiveMQ supports ordering of a single producers messages; so the only
> way to get things to arrive out of order is to have multipe producers
> and get the messages to interleaved. i.e. so for producers M and N,
> one consumer might see M1, M2, N1, N2 the other might see M1, N1, M2,
> N2 etc
>
>
>
> On 3/19/07, Allesmallachen <Spammails@web.de> wrote:
> >
> > Hi,
> > the JMS specification says that "JMS does not define order of message
> > receipt across destinations". The documentation on the websites only
> > describes ordering issues with mutiple sessions or mutiple producers. But
> > what about one producer and several consumers with different topics?
> >
> > I've tried to get the ActiveMQ to make mistakes that show that there is no
> > ordering across destinations. I have two TopicSubscribers with two different
> > Topics (one nomal "m", one temporary "x") under same session and one
> > TopicPublisher under a different session that publishes messages to the two
> > different topics in a separate Thread. To make this a little bit more
> > challeging for the ActiveMQ I've also added a few other consumers for topic
> > m.
> >
> > However no matter how many message I send, all are received in the correct
> > order also accross destinations. For exampe if the publisher sends
> > m1;m2;x1;m3;x2 ... then m1 to m3 are received by the subscriber to m and
> > then afterwards x1 is received by the subscriber to x and so on. Everything
> > in perfect order.
> >
> > I know that a session is a single threaded context and therefore it is clear
> > to me that the consumer's onMessage methods will be called in order if the
> > messages arrive in order. However, does this mean that ActiveMQ supports
> > ordering across destinations or is my TestCase just too simply to force
> > mistakes?
> >
> > Best regards,
> > Christian
> > --
> > View this message in context: http://www.nabble.com/Order-of-message-consumption-across-destinations-tf3425028s2354.html#a9546365
> > Sent from the ActiveMQ - User mailing list archive at Nabble.com.
> >
> >
>
>
> --
>
> James
> -------
> http://radio.weblogs.com/0112098/
>


-- 

James
-------
http://radio.weblogs.com/0112098/

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