Hi Matwey,<br><br>That's right. Publishers can sometimes learn about subscribers being missing (see the "immediate" and "mandatory" flags to Basic.Publish), but subscribers can in general not learn whether any matching publisher exists at any given time.<br>
<br>One workaround might be to use something like my experimental presence-exchange: <br><ul><li><a href="https://github.com/tonyg/presence-exchange">https://github.com/tonyg/presence-exchange</a><br></li><li><a href="https://groups.google.com/forum/#!msg/rabbitmq-discuss/8BNgJ794840/VuNx-QiquKQJ">https://groups.google.com/forum/#!msg/rabbitmq-discuss/8BNgJ794840/VuNx-QiquKQJ</a></li>
</ul><p>Cheers,<br> Tony</p><p><br></p><br><div class="gmail_quote">On 30 March 2012 11:20, Matwey V. Kornilov <span dir="ltr"><<a href="mailto:matwey.kornilov@gmail.com">matwey.kornilov@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi,<br>
<br>
<br>
I can't understand some amqp concepts because they are new to me. If I use<br>
pub/sub pattern (just as described in tutorial), there is exchange and<br>
consumers' queues bound with it. Do I understand right that there is no way<br>
for consumers to know whether there is client who writes to this exchange?<br>
Moreover, there is no way to know if the publisher is dead or just there is<br>
nothing to publish?<br>
<br>
What is the right way to implement subscribers' behaviour such that they<br>
move to some 'autonomous' state in case of publisher death or disconnection?<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Tony Garnock-Jones<br><a href="mailto:tonygarnockjones@gmail.com" target="_blank">tonygarnockjones@gmail.com</a><br><a href="http://homepages.kcbbs.gen.nz/tonyg/" target="_blank">http://homepages.kcbbs.gen.nz/tonyg/</a><br>