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< Erlang ~ [still newbie] FSM, timeouts and ignoring events |
| sv75 |
 Posted: Mon Oct 22, 2007 3:06 pm |
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Joined: 19 Oct 2007
Posts: 10
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I'm studying FSM sample from http://www.erlang.org/doc/design_principles/fsm.html
I wonder how to ignore any buttons pressed when door is open without using additional timers. Sample above just terminates its execution in this case because there is no open({button, Digit}, State) function. I can add
Code: open({button, Digit}, State) ->
io:format("button ignored~n", []),
{next_state, open, State};
but it breaks timeout that was set before. And I cannot get remaining time to set it again.
Any advices, please? Functions start_timer/cancel_timer are marked as internal. Should I just get over it and use timer module? |
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| francesco |
| Posted: Tue Oct 23, 2007 2:15 pm |
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Joined: 07 Jul 2006
Posts: 249
Location: London
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| sv75 |
| Posted: Wed Oct 24, 2007 10:22 am |
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Joined: 19 Oct 2007
Posts: 10
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francesco wrote: Try
Code: open(_, State) ->
{next_state, open, State};
Timeout still never happens. Ok, I can live with timer:apply_after... |
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| francesco |
| Posted: Wed Oct 24, 2007 1:09 pm |
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Joined: 07 Jul 2006
Posts: 249
Location: London
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When you receive a message, you reset the timeout. The only way to avoid it is to use, as you suggest, the timer module.
Francesco
--
http://www.erlang-consulting.com |
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