Task Loop

> Hi, I'm a bit confused by WATask, maybe you can help me please?
>
> When implementing #renderConentOn in WAComponent I know that if I don't
> send self #answer that WAComponent will remain visible (assuming I don't
> call anything else).
>
> This is not the same with a WATask which answers automatically when #go
> terminates.
>
> I would like to have a WATask subclass that does the following.
>
>    1) Call a WAComponent which has a form to collect some information.
> This WAComponent will only answer if all the fields are syntactically
> valid.
>    2) Using the inputs from the component called in (1) perform some work.
>    3) If this work fails (i.e. the inputs were semantically invalid)
> start from (1).
>
> I was expecting this to happen without looping in #go.
>
> An alternative to looping would be to have the view call the task rather
> than answer to the task but I think this breaks the encapsulation of the
> task.
>
> I though I might find some answers in WATask...
>
> renderContentOn: html
>    self session redirectTo: (html urlForAction: [[self answer: self go]
> repeat])
>
> This looks like it wants to loop to me! If not, what's the #repeat for?
>
> So, I'm quite confused now.
>
> Thanks,
> Zulq.
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> I think it only repeats if the WATask is the root controller (ie. if
> it has nothing to #answer: to).  If it does have something to answer
> to, then the context is going to jump out of that block and back to
> the caller and thus the loop will never happen.  The looping in WATask
> is really just there as an odd special case that can be useful when
> testing or developing with a WATask as the root.  The task is not
> intended to loop in the general case.
>
> If you want looping behaviour, just write it in the #go method like
> you would for any other function:
>
> go
>   [self isWorkSuccessful] whileFalse:
>     [self getSomeUserInput.
>      self doSomeWork]]
>
> Or whatever... you get the idea.
>
> Julian
>