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Is there some sort of a specification or other explanation that describes the normal cases where you can expect a message sent on a ZeroMQ socket to not be received by ( all ) the listening processes, for each communication type?
For example I have an experimental program which basically assumes that all subscribers to a PUB socket receive all messages sent on that socket ( after an initialization handshake ). I would like to understand the cases where that assumption may be false. Thanks, and sorry if this has already been asked.
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ZeroMQ guarantees to deliver all the parts (one or more) for a message, or none of them. This allows you to send or receive a list of frames as a single on-the-wire message. A message (single or multipart) must fit in memory.
ZeroMQ patterns are implemented by pairs of sockets with matching types. The built-in core ZeroMQ patterns are: Request-reply, which connects a set of clients to a set of services. This is a remote procedure call and task distribution pattern.
ZeroMQ provides a whole slew of language APIs which run on most operating systems and allows you to communicate seamlessly between all sorts of programs. It also provides a collection of patterns, such as request-reply and publish-subscribe which assist you in creating and structuring your network.
No, there's no method in the API to check if a socket is connected. ZeroMq abstracts the network; client and server connections are completely transparent to the peer making the connection.
The chart in this image is a good guide to when zmq sockets drop messages: https://raw.github.com/imatix/zguide/master/images/fig25.png
For more information, you might want to read http://zguide.zeromq.org/py:all#Missing-Message-Problem-Solver
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