[erlang-questions] Is there a way to serialise a running process & resume it later (i.e. continuations)

Mathias Picker <>
Fri Feb 27 12:26:35 CET 2009


Am Donnerstag, den 26.02.2009, 21:06 -0300 schrieb Adriano Bonat:
> http://yarivsblog.com/articles/2008/02/17/seaside-style-programming-in-erlyweb/

Would be nice if it were that easy. Going back a few pages breaks yaris
solution.

> 
> My "two cents" :)
> 
> On Thu, Feb 26, 2009 at 8:51 PM, jm <> wrote:
> >
> >
> > Robert Virding wrote:
> >>
> >>     To support e.g. the back-button behaviour in browsers elegantly.
> >>     See the
> >>     diverse seaside docs for an example how such a web framework can be
> >>     used, and for a good explanation of why and what read "Inverting back
> >>     the inversion of control or, continuations versus page-centric
> >>     programming (2001)"
> >>     http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.29.3112
> >>
> >>
> >> Seeing the state of a process is kept explicitly in the arguments of
> >> the functions implementing it it is easy to save the state of a
> >> process and so step "backwards" when you want to. If you wish you can
> >> keep a stack of process states and step backwards and forwards as you
> >> wish. If the problem is just this then I still don't see the problem.
> >>
> >
> > More explicitly,
> >
> >  * stored an id as part of the URL call it UrlId
> >  * store contexts, {UrlId, Cxt}, as part of a list for an acceptable
> > history range, say 10 histories per browser.
> >     ie, [{UrlId, Cxt}, ....]
> >
> >  for an incoming request:
> >     extract the id, UrlId
> >     case proplist:lookup(UrlId, Contexts) of
> >          none ->
> >              %% return on error page
> >              error_page(no_context, ....);
> >         {UrlId, Cxt} ->
> >              %% Found state do work
> >               make_page(Cxt, ....)
> >     end.
> >
> >
> > Something like that should do what you wish. I've glossed over the finer
> > points.
> >
> > Jeff.
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://www.erlang.org/mailman/listinfo/erlang-questions
> >
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