[zeromq-dev] how to implement the subscriber in the black box pattern

Pieter Hintjens ph at imatix.com
Thu Sep 19 11:57:43 CEST 2013

This was certainly our intention. I'm not sure the code does that type
checking yet, but the protocol supports it.

However, it's not as simple as it sounds, since connections are
background actions and invisible to applications. So connection
failures are too. We have the same issue with security, and the
current answer is to simply deny the connection, as if there was no
network connection. But this won't help users debug problems. I'm not
a fan of having to do extra work (context monitoring) to catch such

Perhaps the better approach is to raise a fatal error on the socket so
all further operations on it fail, after a socket type error, or a
security failure. The error would happen asynchronously, but would at
least show on the radar without extra work.


On Thu, Sep 19, 2013 at 11:34 AM, Charles Remes <lists at chuckremes.com> wrote:
> Will the upcoming version 4 release enforce proper socket pairings so that doing something odd like connecting PUSH and SUB will raise an error?
> cr
> On Sep 19, 2013, at 2:46 AM, Pieter Hintjens <ph at imatix.com> wrote:
>> You can't connect a PUSH to a SUB; use a PUB socket to send the data.
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