plain_fsm - for beginners and purists

Ulf Wiger <>
Fri Feb 13 10:11:45 CET 2004


On Fri, 13 Feb 2004 08:29:58 +0100, Vlad Dumitrescu 
<> wrote:

> There is one more alternative that wasn't discussed yet:
>
> receive
>     .... %% nomal caluses
>     Msg ->
>         plain_fsm:handle(State, Msg)
> end;
>
> This is all plain Erlang, and nobody can misunderstand it. One possible 
> problem is that we can't have this handling before all other processing,
> but it doesn't feels like a big constraint. Are there other reasons, 
> Ulf? ;-)

Well, it forces the programmer to accept that messages not recognized by
the preceding clauses (which are not system messages) are summarily
discarded. In some cases, this is indeed what one wants, and then I'd
agree that it's a better solution. In other cases, it might well be
a disaster (possibly... I'm not totally convinced that handling of
system messages and discarding unexpected messages don't practically
always go together.)

I could include that as an alternative. It could complement the others.

/Uffe
-- 
Ulf Wiger, Senior System Architect
EAB/UPD/S

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