[erlang-questions] OTP application design

Vlad Dumitrescu <>
Tue Jun 12 21:15:25 CEST 2007


Hi,

On 6/12/07, Kirill Zaborski <> wrote:
> Vlad, thanks for your explanations but you missed the point :)

Sorry!

> But I have also a task (for testing purposes) to write a worker emulator
> (apart from actual workers) or maybe a couple of emulators with a different
> logic. And those emulators should act like normal workers (which will be
> gen_server+API) so they must implement handle_call({work,Data}) and I can
> not use some behavior to declare API common to both "normal" worker and
> worker emulator.

Why can't the API be common?

Let me see if I understand correctly. You want the workers to have a
common API, but be able to run code from two (or more) modules, where
one is the "real" one and the other is the "emulated" one?

Put the API in module 'worker'. Then implement two gen_server
behaviours, 'real_worker' and 'emulated_worker'. When creating a
worker, use the appropriate module name as the 'Module' argument to
gen_server:start_link/3. Done! The rest of the API just uses a pid and
doesn't care which module implements the functionality.

regards,
Vlad



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