[erlang-questions] Custom behavior background information

[Frans Schneider]

Hi list,

I find myself repeating code in several gen_server and gen_fsm behavior 
based modules. These modules should all share about eight functions, all 
doing exactly the same thing. On top of these modules, more elaborate 
modules with common functions have to be defined, adding four or so 
functions. To me, this is looking like defining my own custom behaviors.
I had a look at the implementation of the Erlang supervisor for 
extending the gen_server behavior which gives enough information to get 
something working. However, I have no glue how to extend the gen_fsm 
behavior and keep the interface to defining states in the new behavior.
So, what I am looking for is some reference material on writing custom 
behaviors on top of what Erlang central and the OTP documentation offer.

TIA,

Frans
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