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From "Reinhard Poetz" <reinhard_po...@gmx.net>
Subject RE: Continuations are broken?
Date Thu, 20 Jun 2002 16:57:35 GMT
> -----Original Message-----
> From: Ovidiu Predescu [mailto:ovidiu@apache.org]
> Sent: Thursday, June 20, 2002 4:48 AM
> To: cocoon-dev@xml.apache.org
> Subject: Re: Continuations are broken?
>
>
> On 6/19/02 12:48 PM, "Vadim Gritsenko"
> <vadim.gritsenko@verizon.net> wrote:
>
> > Hi Ovidiu, and hi all,
> >
> > Either I did not understood continuations or they do not work as
> > advertised. Walk through this test case and tell what/who is wrong:
> >
> > 1) Access http://localhost:8080/cocoon/samples/flow/examples/calc/
> >
> > 2) Type "10", Enter.
> >
> > 3) See page with A = 10.
> > URL is
> > http://localhost:8080/cocoon/samples/flow/examples/calc/kont/3f557504821
> > 5621d3c1c32191d868b573f751c7f?a=10
> >
> > 4) Open another browser window with this URL. See page with A = 10
> >
> > 5) Window 1: Enter B = 10
> > URL will be:
> > http://localhost:8080/cocoon/samples/flow/examples/calc/kont/1b261330647
> > 176442d5f45335c406211594a1d4f?b=10&submit=Enter
> >
> > 6) Window 2: Enter B = 20
> > URL will be:
> > http://localhost:8080/cocoon/samples/flow/examples/calc/kont/6034270b2e1
> > 5555a6b7c4a591512417a3c3c437c?b=20
> >
> > 7) Window 1: Select "plus", click "Do It"
> >
> > 8) See in Window 1: Result = 30.
> >
> > I expected to see 20, because B = 20 was entered in another window and
> > went to continuation 6034270b2e15555a6b7c4a591512417a3c3c437c, and B =
> > 10 should be in continuation 1b261330647176442d5f45335c406211594a1d4f,
> > however, both continuations has same B = 20.
> >
> >
> > Am I mistaken?
>
> No, you're not mistaken, this is the correct behavior.
>
> Rhino used to have the behavior you described, but Christopher
> and I decided
> is better to have the current one, which is more useful to real
> applications.
>
> One effect of this change is that you can no longer implement what-if
> scenarios as easy as before. Christopher and I were talking about various
> solutions, but none of them is cheap enough at runtime to be worth the
> effort.

What is the advantage of continuations? It seems that the calculator example
has only one state ...

Regards,
Reinhard


>
> Regards,
> --
> Ovidiu Predescu <ovidiu@apache.org>
> http://www.geocities.com/SiliconValley/Monitor/7464/ (Apache,
> GNU, Emacs...)
>
>
>
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