| [Time] Name | Message |
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[10:49] pieter_hintjens
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Have defined a spec for device configuration: http://rfc.zeromq.org/spec:3
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[13:38] pieterh
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if 0MQ added a silent null to the end of zmq_msg_t data, it'd be automatically string safe in C
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[17:05] theonewolf
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hey i have a question about the REQ-REP hello world example, i notice that if i kill the server prematurely, the client blocks indefinitely on zmq_recv, even if i later bring the server back up, is that expected?
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[19:26] emacsen
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Hi. I"m going to ask a very n00b question here, and I apologize if this is dumb, but in the 0mq model, is there a 1:1 correlation between a socket and a queue?
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[19:27] emacsen
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queue|channel|message bus
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[19:33] sustrik
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no, each socket has a queue/buffer per peer
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[19:33] emacsen
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sustrik, maybe I'm not being clear
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[19:34] emacsen
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lemme look up the AMQP terminology so I'm less unclear
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[19:35] emacsen
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okay, the word I want is stores? or exchanges... the thing to which a client subscribes
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[19:35] emacsen
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I think they call that an exchange
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[19:36] sustrik
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ah, you mean a central component, that all clients connect to?
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[19:36] emacsen
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so, let me explain what I mean rather than use the word
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[19:36] sustrik
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ok
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[19:36] emacsen
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if I send a message, and want it to fan out to multiple clients
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[19:37] emacsen
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the way I address it in terms of AMQP exchange determines which queues it goes into
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[19:37] emacsen
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...I think that's right... it's been a while since I looked at AMQP
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[19:37] sustrik
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np, use your own words
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[19:38] emacsen
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but essentially what I want is lots of "addresses" that a client can subscribe to
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[19:38] emacsen
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and the messages get to the right clients
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[19:38] emacsen
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but not to ones that the messages don't need to go to. If that makes any sense?
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[19:38] emacsen
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that is the fanning is selective
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[19:39] sustrik
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yes, it's called subscriptions
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[19:39] sustrik
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you are listining to a feed, however, you want only messages that match certain criteria
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[19:39] emacsen
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right
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[19:40] sustrik
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ok
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[19:40] sustrik
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what's the question?
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[19:40] emacsen
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Does 0mq support that, or is that at the application layer?
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[19:40] sustrik
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it does
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[19:40] sustrik
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use PUB socket on the publisher side
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[19:40] sustrik
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SUB socket on the subscriber side
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[19:41] emacsen
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okay... I'm not sure I see this in the docs, though I see the word subscriptions :)
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[19:41] sustrik
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use zmq_setsockopt(ZMQ_SUBSCRIBE, "...");
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[19:41] sustrik
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to choose which messages to receive
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[19:41] sustrik
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check the guide
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[19:41] sustrik
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let me see...
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[19:42] sustrik
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http://www.zeromq.org/docs:user-guide#toc5
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[19:42] emacsen
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ah thanks
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[19:44] emacsen
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okay, but (and this isn't a problem necessarily) the subscription seems fairly static
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[19:44] emacsen
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that is the AMQP one is both very powerful and complete, yet somehwhat complex
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[19:44] sustrik
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what do you mean by "static"/
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[19:44] sustrik
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?
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[19:44] emacsen
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the filter is a string
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[19:45] emacsen
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or looks/acts like a string :)
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[19:45] sustrik
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can be binary
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[19:45] emacsen
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so in the zipcode example, I couldn't ask for more than one zipcode
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[19:45] emacsen
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I couldn't send to more than one, and I couldn't recieve to more than one
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[19:46] emacsen
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(that's not a terrible thing on its own, I just want to be sure I understand)
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[19:46] sustrik
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you can subscribe for as much topics as you wish
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[19:46] emacsen
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is there a practical limit?
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[19:46] sustrik
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no
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[19:46] emacsen
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16k subscriptions no problem for one server?
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[19:46] sustrik
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no
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[19:46] emacsen
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works for me :)
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[19:46] sustrik
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:)
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[19:47] emacsen
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I have a potential use for this. It'll depend on other folks
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[19:47] sustrik
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great
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[19:48] emacsen
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thanks for your help
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[19:49] sustrik
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you are welcome
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[20:23] benoitc
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hi all
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[20:24] benoitc
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i get this comilation error on osx 10.6 : http://github.com/zeromq/erlzmq/issues#issue/2 any idea what it could be ?
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[20:26] sustrik
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benoitc: you are presumably using wrong repo
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[20:26] sustrik
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erlang binding works only with experimental branch sustrik/zeromq2
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[20:26] benoitc
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hum
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[20:27] benoitc
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at which point it is experimental ?
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[20:28] sustrik
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sockets can be migrated between OS threads
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[20:32] benoitc
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using the branch I get "./configure: line 18331: syntax error near unexpected token `GLIB,'
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[20:32] benoitc
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"
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[20:33] sustrik
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are you using ./configure --with-pgm?
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[20:33] benoitc
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yes
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[20:34] sustrik
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do you have glib installed?
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[20:34] benoitc
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yup
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[20:34] sustrik
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then it's some kin of autotools/OSX issue
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[20:34] sustrik
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sorry, i have no OSX here
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[20:34] sustrik
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cannot help
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[20:34] sustrik
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try asking at the mailing list
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[20:34] benoitc
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mok thanks
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[20:37] benoitc
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will do thx anyway
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[21:10] benoitc
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sustrik: pgmm is required for erlang stuff ?
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