[zeromq-dev] Q: type-tagging messages - prefix an uint32 or a frame?

Lionel Orry lionel.orry at gmail.com
Mon Jun 29 07:48:39 CEST 2015

Hi Michael,

Le 19 juin 2015 16:00, "Michael Haberler" <mail17 at mah.priv.at> a écrit :
> so far we are using protobuf for serialization, with a single protobuf
message being the supertype and container of all possible other message
> we are switching to tagging - each frame has a 32bit-sized tag which
encodes message type *), as well as message encoding
> so we have two options:
> (1) just prefix each message (whatever type/encoding) with the tag, in a
single frame
> (2) prepend a 4-byte frame with the tag, which says how to interpret the
following frame

You could also have a look at http://www.tnetstrings.org

> (2) would be easier to autodetect for backwards compatibility, at the
cost of extra ZMTP framing overhead
> (1) would need a heuristic test which I dislike
> any suggestions one way or the other?
> are there any significant runtime performance implications of using (2)?
> thanks,
> - Michael


> *) since protobuf lacks a message type ID, Petteri Aimonen and me came up
with the msgid option in the .proto spec, see
> this could be useful for other protobuf users as message type ID's are a
recurring question
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