[Seaside] Re: Many VM push using Comet?

Richard Durr richard.durr at googlemail.com
Tue May 4 08:06:07 UTC 2010

That is part of my problem: I do not have a persistency scheme,
because I do not know what I need to get Comet working like described.
I want the Push happen directly when something changes – otherwise it
would be possible to comit everything to Magma for example before
pushing, like you said. But that would require to push regulary and
not event based (something changed) :(

Thanks so far!

On Mon, May 3, 2010 at 11:04 PM, Yanni Chiu <yanni at rogers.com> wrote:
> I think more information is needed, for people to be able to give advice.
> "dataobjects that are stored in a collection". What is your persistence
> strategy? Do you save the image? What would happen when you have multiple
> images that all try to save the image?
> Are you using a relational DB or object database to save your "dataobjects".
> If so, then a refresh, just before the Comet push, should suffice - unless
> you have a large working set of objects.
> --
> Yanni
> Richard Durr wrote:
>> Hello everybody,
>> I have a design related question.
>> Situation: I want to create a Comet-based Application that allows
>> users do edit dataobjects that are stored in an collection. Users can
>> form groups. Each group has one of those collections. When a user logs
>> in, he can change the dataobjects of his group using ajax and see the
>> changes using comet that other users make to other dataobjects of his
>> group.
>> Problem: Having all of this in one vm is not a problem, because I can
>> push the changes directly when they are made. However, when I have
>> many many users, I need to split the load to a few different vms. Then
>> some users of a group might be on a different vm than other users of
>> the same group. How is it possible to let the users on one vm see the
>> changes the users on another vm make to the dataobjects then?
>> Possible Solution: I suppose I need some sort of shared / distributed
>> notification center where I can post that an object has changed and
>> that informs the different vms that this happened so that they can
>> push the changes using Comet.
>> Can anybody offer advice? Any help would be appreciated.
>> ^^
>> RD
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