[erlang-questions] Maps & records: binding directly to bitstring comprehensions

Mike Oxford <>
Sat Feb 8 01:20:03 CET 2014

Can you make them use protobufs?  Or "hey, be more like the facebook that
you love and use thrift like facebook does?"  It gives you the framing that
JLA was speaking of and still maintains a tight, compact binary format
(probably even tighter than they're shipping already.)

When they change the .proto/.thrift file you can just take that and
generate your end.  They can change it all over and work on your end is
minimal when they rev.

On Fri, Feb 7, 2014 at 1:38 PM, Erik Søe Sørensen <> wrote:

> Indeed - I've found that Erlang is great for writing small interpreters
> for declarative specifications of domain logic. And a particularly good
> thing about that approach is when you can have one specification but
> multiple interpreters (encoder/decoder, evaluator/type checker, ...).
> Den 07/02/2014 22.16 skrev "Jesper Louis Andersen" <
> >:
>> On Fri, Feb 7, 2014 at 5:24 PM, Felix Gallo <> wrote:
>>> Jesper, your instinct are correct as usual.  Unfortunately the protocol
>>> designers live upstream in a different group over which I have no control,
>>> and are incentivized to take the Facebook mantra of "move fast and break
>>> things" to heart.
>> One way would perhaps be to screw performance. Break the decoder into
>> multiple small pieces and define an interpreter for the small pieces. Now,
>> the definition is given by the input to the interpreter. It will be slow,
>> but it will be easier to reconfigure. When things slow down, you can
>> replace the interpreted variant with a faster code variant. The idea is
>> that you only need to implement each new concept they cook up, but not each
>> change.
>> The basic idea is to have a grammar for the format and then employ a
>> parser generator on the grammar. But you probably don't need the speed up
>> front, only getting the definitions correct.
>> --
>> J.
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