[zeromq-dev] java server (DEALER) + worker / c client (REQ)

Apostolis Xekoukoulotakis xekoukou at gmail.com
Thu Sep 27 18:51:04 CEST 2012

You are printing the frame, not the data.

Also, is java's encoding the same as that of C's?
Maybe this is your problem.

2012/9/27 Davis Ford <davisford at gmail.com>

> Hi, I'm trying to get some variation of a DEALER / REQ pattern, where the
> server (in java) dispatches messages to worker threads.
> Similar to the example here (Java) =>
> http://zguide.zeromq.org/java:tripping
> Same example here (C) => http://zguide.zeromq.org/c:tripping
> Except I have a Java server with workers and a C client.
> My code is here: http://pastebin.com/K483HAJY
> The C client will connect to the frontend socket and does a synchronous
> write, the write is received, the address frame popped off, and a new
> address frame is pushed on for the backend worker.  The backend worker
> thread receives the msg, it pops off the address frame and pushes on a new
> "C" identity frame, and tries to send to the frontend socket.
> Unfortunately, the client never receives a reply.  I had thought that if I
> do this:
> void *client = = zsocket_new(ctx, ZMQ_REQ);
> zsocket_connect(client, "server-url");
> zsocket_set_identity(client, "C");
> Then this would have the effect of pushing an identity frame on all
> outgoing messages on that socket, which should be the "C" character, but if
> I print the messages on the server side, this is what I see:
> waiting to receive on frontend...got a message on frontend...
>    popped address frame: *00800041A7*
>    pushed 'W' address frame and sending to backend..
> received message on worker:org.zeromq.ZMsg at 5db0531
> waiting to receive on backend...got a message on backend...
>    popped address frame: W
>    pushed 'C' address frame and sending to frontend..
> It seems the address frame coming in on the client is some random number,
> not "C", so I'm guessing this is why the client never receives a response.
>  What am I doing wrong?
> Thanks in advance
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> zeromq-dev at lists.zeromq.org
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Sincerely yours,

     Apostolis Xekoukoulotakis
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