[Seaside] Session/component sharing

Sebastian Sastre ssastre at seaswork.com
Mon Oct 8 18:00:17 UTC 2007

Normally AJAX allows client-server interaction in a kind of half duplex
fashion. Comet, the reference that What Lukas passed to you as reference
will allow you to make a full duplex comunication between clients. I don't
know how mature comet is for seaside nor how secure it is.

What I said to you it's about having decoupled the model domain from the
application domain. MVC and MVP (Model View Controller and Model View
Presenter) are "frameworks" that used to help to maintain decoupled the
observations of the model. This is a very commmon thing in smalltalk I don't
know how familiarized with that you are but for your question I'll suggest
to read a little about them at least to get the idea.

Components can "look" a common model when they should render something that
is sharing a model without sharing the observation (each session will make
it's own instances of the components that produce observation of the model).

You can make a model (an object graph) that is not aware that is being
observed by seaside compoenets at all. See:

		count := count + 1

That's the model (a graph of only one object but could be the model of an
entre company) made singleton for simplified persistance or retrieved from
your favorite persistence mechanism.

	"Returns the instance of the receiver."
	^ CounterModel instance
	"Makes the receiver to increment one."
	self counter plusOne

CounterPresenter>>renderContentOn: html
	"Renders the receiver in the html canvas"

	html paragraph: self counter count.

	html anchor
		callback:[self increment];
		text: '+'.

If CounterModel>>instance returns the common model, then any number of
sessions rendering CounterPresenters will observe (and affect) that same

Sebastian Sastre
PS: as you can see there is no global (beside the class names)

> -----Mensaje original-----
> De: seaside-bounces at lists.squeakfoundation.org 
> [mailto:seaside-bounces at lists.squeakfoundation.org] En nombre 
> de Robert Krahn
> Enviado el: Lunes, 08 de Octubre de 2007 12:13
> Para: Seaside - general discussion
> Asunto: Re: [Seaside] Session/component sharing
> Am 08.10.2007 um 15:44 schrieb Lukas Renggli:
> > Have a look at the comet package in the Seaside repository.
> Great, this is what I was looking for :-)
> Am 08.10.2007 um 14:59 schrieb Sebastian Sastre:
> > Why you wish to share the view when you can share the 
> model? You can't 
> > make everybody to have it's own observation of it?
> Sorry, I don't know if I understand your question. How can I 
> share the model between different users/browsers? Maybe with 
> class variables as global state?
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