[Seaside] Application level state

Esteban A. Maringolo emaringolo at gmail.com
Thu Jul 20 18:15:41 UTC 2017

I'm not sure I understand what you want to achieve. If the application
model is a globally accessible singleton, then the #applicationModel
method you defined would be enough.

But if you want to share a single "application" among different
Seaside applications then I think that is not possible, or at least
not designed to be used in that way.

What I normally do is to have a "application/system" object per each
user session,which is tied to a single Seaside Application, if you
wanted to share that "system" between two different sessions, then
you'll need a way to register them globally and lookup it when a new
session is created for another seaside app.

Let's say you have two apps: /app1 and /app2
When user Alice logs into app1, then you create an instance of
YourApplication and assign it to app1 session and register it globally
somewhere, when Alice logs into app2, you could lookup first if there
already is a registered instance for her and use that one instead. It
seems dirty and I don't know why you'd want to do that. But that's the
first, albeit dirty, solution that comes to my mind.


Esteban A. Maringolo

2017-07-20 14:50 GMT-03:00 Bernhard Pieber <bernhard at pieber.com>:
> Hi Philippe,
> Thanks for the reply. It is the business model of the application. Now I have a class called BpApplicationModel with a class variable default. On my components I have the following method:
> applicationModel
>         ^BpApplicationModel default
> I want to register the same application twice under different context paths using different BpApplicationModel instances. I could solve this with a dictionary singleton with the WAApplication as the key. However, it seems easier and cleaner if I could implement something like:
> applicationModel
>         ^self session application model
> Cheers,
> Bernhard
>> Am 20.07.2017 um 13:13 schrieb Philippe Marschall <philippe.marschall at gmail.com>:
>> On Wed, Jul 19, 2017 at 6:39 PM, Bernhard Pieber <bernhard at pieber.com> wrote:
>>> Hi all!
>>> I have subclassed WASession to add my own session specific state. I would like to do the same for WAApplication. However, I have read in the mailing list that WAApplication is not supposed to be subclassed.
>>> I tried using preferenceAt:put: to set my root model object. However, I get WAAttribute not found. This feature seems to be for configuration purposes, mostly simple data types and classes.
>>> So far I used the singleton pattern, a class variable in my root object model class. But now I would like to register the same component class twice using different context paths.
>>> What is the most idiomatic way to achieve this in Seaside?
>> Can you go a bit into the details of the state? Is that more
>> configuration is nature or more a business model?
>> Cheers
>> Philippe
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