[zeromq-dev] Many to many

Whitney Jackson whjackson at gmail.com
Sun Feb 17 09:15:27 CET 2013


Yeah sure. It'll work just fine with tcp endpoints.


On Sun, Feb 17, 2013 at 2:11 AM, Lee Sylvester <lee.sylvester at gmail.com>wrote:

> That's wonderful, thank you. But, what about across servers? Wouldn't I
> need to rely on TCP? If so, can they also do this?
>
> Thanks,
> Lee
>
> Sent from my iPhone
>
> On 17 Feb 2013, at 07:48, Whitney Jackson <whjackson at gmail.com> wrote:
>
> > I'm guessing the subs cannot connect to many?
>
> Guess again :) Here's a python example:
>
> # start sub.py
> import zmq
> c = zmq.Context()
> s = c.socket(zmq.SUB)
> s.setsockopt(zmq.SUBSCRIBE, '')
> s.connect('ipc://ep1')
> s.connect('ipc://ep2')
>
> while True:
>     m = s.recv()
>     print m
>     print ''
> # end sub.py
>
> # start pub.py
> import time
> import zmq
>
> c = zmq.Context()
> s = c.socket(zmq.PUB)
> s.bind('ipc://ep1')
> s.bind('ipc://ep2')
>
> while True:
>     print 'hi'
>     s.send('hi')
>     time.sleep(1)
> # end pub.py
>
> sub.py will print two 'hi's every second because it received one on
> ipc://ep1 and another on ipc://ep2.
>
>
>
> On Sun, Feb 17, 2013 at 1:22 AM, Lee Sylvester <lee.sylvester at gmail.com>wrote:
>
>> Thank you for your reply, Witney, but I need it the other way. I need a
>> sub socket to be connected to multiple pub endpoints... This is because
>> every instance will have a single publisher, telling all who is interested
>> about events, but that same service will want to list to an arbitrary
>> number of other services for their events. Essentially, I'd be forming a
>> type of mesh, where each service has  two endpoint (pub and sub) and all
>> connect to all. I knew pub could connect to many, as it binds, but I'm
>> guessing the subs cannot connect to many?
>>
>> Thanks loads,
>> Lee
>>
>> Sent from my iPhone
>>
>> On 17 Feb 2013, at 05:18, Whitney Jackson <whjackson at gmail.com> wrote:
>>
>> > Is it possible for a sub socket to bind to multiple pub sockets?
>>
>> Yes. You can call bind and/or connect on a socket as many times at you
>> like.
>>
>> > If so, where is there an example of this?
>>
>> Here's an example from the guide where a pub socket is bound to multiple
>> endpoints:
>>
>> http://zguide.zeromq.org/page:all#Getting-the-Message-Out
>>
>> If you connect a sub socket to multiple endpoints then it gets a message
>> whenever any of the publishers to which it's connected send.
>>
>>
>>
>> On Sat, Feb 16, 2013 at 4:18 PM, Lee Sylvester <lee.sylvester at gmail.com>wrote:
>>
>>> Hey guys,
>>>
>>> So, I want to do a many to many pubsub.  I already have a discovery
>>> mechanism and logging, but what I need is for a service to bind to a pub
>>> socket and subscribe to a set list of instances of itself on the server and
>>> other servers. The Zyre framework, although awesome, seems a little large
>>> for my needs as I already have a number of the features it supplies built
>>> in to my framework. Is it possible for a sub socket to bind to multiple pub
>>> sockets?  If so, where is there an example of this? Can I also add a pub
>>> socket to listen to when all is already running?
>>>
>>> Thanks,
>>> Lee
>>>
>>>
>>> _______________________________________________
>>> zeromq-dev mailing list
>>> zeromq-dev at lists.zeromq.org
>>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>>
>>
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