Hi all,
I'm a trying to build more skills around networking, something I have little to
none experience with. I'm writing a tiny application in my spare time using 0MQ
and enjoying the learning experience thus far.
So far I've had success writing a simple single threaded host and client 1-to-1
application using one REQ-REP socket where the host messages the client and the
client calls an appropriate function RPC-style.
Now, I'm trying to do a little more and wanted to request some architectural
advice. I apologize in advance if this isn't the correct mailing list to be
asking these types of questions.
Ideally what I would like is to retain this host-client relationship, but
1-to-N where there are N number of clients for 1 host. While N is going to
remain relatively small (no more than 10, say). I'd like the host to be able to
tell when a new client has connected and when an old client has dropped off. I
would also like the host to be able to differentiate the clients and control
messaging to them on an individual basis, i.e. not PUB-SUB since the host might
want to send message 1 to client A and message 2 to client B. The host doesn't
know the value of N, and N can change.
Additionally, I would like the host to be able to do step-wise calls. For
instance, the host would want to wait until all clients respond to completing
step 3 before telling clients to start on step 4. It would also be nice to know
if 5 clients are on step 3, and a 6th client joins the party, for the host to
be able to tell this information and have the 5 old clients wait while the 6th
client catches up to step 3 before telling everyone to continue to step 4.
To support this, would the host need to have one thread with one REQ-REP socket
per client? How would the host know when a new client connected? Would another
separate thread on the host be needed with a PULL sink that each client will
PUSH a message to? How would the host know when all N clients are done with
each step?
Before I start heavily playing around with this, I wanted to bring these
questions and my ideas up to see if I'm on the right track or way off base. I'm
using 0MQ 2.1.3, writing C++ on Windows, for fun =). Thanks in advance for your
comments.
-Mike
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