On 2020-12-30 David Santiago <deman...@gmail.com> wrote:
> Thanks! It's indeed much clearer. However i have a question, why the
> react on line 24?
>
> The react there isn't required right?
I think it is ☺ The code, without the debugging bits::
react {
whenever $channel -> $val {
$conn.print("SENDING\r\n");
react {
whenever $conn-supply -> $line {
if $line ~~ /^340/ {
$conn.print("[$consumer]: value $val\r\n");
} else {
done;
}
}
}
}
}
I read this as:
* loop as long as the channel has values, then exit
* for each value in the channel:
* write to the server
* then loop reading from the server
* and exit *this inner loop* when you get a non-340 line
Without the second ``react``, that ``done`` would exit the first ``react``,
essentially terminating the client. There's probably a way to write
the whole thing differently (keeping more explicit state, probably).
Also, my understanding of ``whenever`` is that it's adding a hook into
the event loop, and only leaving the surrounding ``react`` (or
``supply``) will remove that hook (people who understand this better
than I do: please correct me!). If that's true, adding a hook many
times on the same condition looks wrong to me…
--
Dakkar - <Mobilis in mobile>
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