[zeromq-dev] How to send binary and text massage in one massage

[Joshua Foster]

It is much cleaner and faster to just send a multipart message using 
zeromq. The multipart is still considered a single ZMQ message and will 
be delivered atomically. The guide has some more examples.

Joshua


It would look something like this:

import org.zeromq.ZMQ;

String xml = "<somexml/>"
byte[] attachment = new byte[]{1, 2, 3, 4};

ZMQ.Context context = ZMQ.context(1);
ZMQ.Socket push = context.socket(ZMQ.PUSH);
push.connect("tcp://127.0.0.1:1234");

ZMQ.Socket pull = context.socket(ZMQ.PULL);
pull.bind("tcp://*:1234");


push.send(xml.getBytes(), ZMQ.SND_MORE);
push.send(attachment, 0);

String rxml = new String(pull.recv(0));
byte[] rattachment = pull.recv(0);

> Meir Yanovich <mailto:meiryanovich at gmail.com>
> January 10, 2013 6:06 AM
> so if i understand it right ,
> ( in Java ) i need instead of sending XML marshaled as my main 
> massaging structure ( using Jaxb)
> i will created new java class that has 2 members 1 for the xml and 
> the second as the file as base64 encoded.
> then i will just send this class on the wire ?
> and in the client i will just decode the class and handle the 2 
> members of the class ?
>
>
>
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> Wes Young <mailto:wes at barely3am.com>
> January 10, 2013 5:46 AM
> seems like you could just [compress and/or] base64 encode the entire 
> thing before it hits the zmq stack and de-combobulate it on the other 
> end, then the multi-messaging should be easier(?). that way you're 
> just handing a string to the zmq stack and leaving the heavy lifting 
> to your application.
>
>
> --
> Wes
> wesyoung.me
>
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> Matias Guijarro <mailto:matias.guijarro at esrf.fr>
> January 10, 2013 3:23 AM
> Hi,
>
> Maybe the easiest is to keep the xml format for messages,
> and to encode the binary file into base64 for example.
>
> Or you can maybe use multi-part messages of zmq, first part
> being xml and second (optional ?) part a binary chunk
> corresponding to your file.
>
> Cheers,
> Matias.
>
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> Meir Yanovich <mailto:meiryanovich at gmail.com>
> January 10, 2013 3:16 AM
> Hello all
> im new to zeromq, i setup basic multithreaded server and simple client 
> that are working great ,
> but the communication between  them is xml ( using Jaxb marshaling ) .
> now i want to keep the xml massaging and to add sending binary file on 
> the wire from the server to client .
> what is the best approach to do it ?
> Thanks
>
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