RE: webapp design question

First of all thanks to you and Jacob for answering me in a so precise
manner.

On Fri, 2003-10-24 at 03:07, Christian Cryder wrote:

> Hi Thelmo,
> 
> Ok, so as Jake has already noted, the ObjectRepository provides an alternate
> interface for putting data in the Session, but you may want to be careful
> how much stuff you put in there as that will definitely increase the
> footprint and reduce scalability of the app. A general principle is that you
> want to put as little as possible in the session - and if you do have some
> objects that you want to store there for convenience/performance purposes,
> you may want to store them as "soft" or "weak" objects, allowing them to be
> gc'd if the JVM starts to run low on memory. Barracuda's ObjectRepository
> can help here too with its cache repository.

I've already read the quote about not putting so much stuff within
HttpSession for maintain scalability but... isn't true that when a
session expire all the stuff within get gc'd !?
Anyway i've looked at javadocs about soft and weak implementation and
that's look promising... for my needs.

> 
> Here's an overview of what the ObjectRepository class gives you -
> 
> There are 3 "global" repositories -
[..]
> Likewise, there are 3 "session" repositories that are basically the same as
> the global repositories, except they are scoped to session -
[..]
> Next you have a "local" respository -
[..]
> The local that is scoped within the http request/response cycle - anything
> you put in here (ie. in a request handler) will be available to all other
> portions of your code (ie. in a response handler, internal data layer
> objects, etc). In other words, any code executed within the same thread are
> going to have access to objects in this repository. And any objects placed
> in this repository are automatically removed at the end of the req/resp
> cycle - so you don't have to worry about cleaning things up (unlike global,
> session, or other repositories).

So this mean that if i don't use soft or weak within global and
especially session repositories all the stuff in that is never gc'd ?
And if i understand correctly if it set someting in the local repository
within a handleControlEvent(ControlEventContext) method i get it in the
handlViewEvent(ViewEventContext) one !? Since i don't send/write the
HtppResponse ... right !?

> Finally, there is a method that allows you to get "regular" repositories
> using a Namespace or String naming convention - allowing you to set up your
[..]
> Ok, so now on to the next question: why use the ObjectRepository structure
[..]
> non-servlet environments. That's pretty useful.

That's sounds very powerful ...

> Finally, the ObjectRepository approach also gives you the ability to script
[..]
> building webapps without it.

I definitely have to study and learn it deep.

> Does that help explain things a bit?

Sure and for that tanks again, but now i would like to ask one more
(little) thing ;)
In the event-gateway.xml file there's a way to specify which handler
within a factory is interested in which event ?
I would like to get the same behavior as with this (for ex):
specifyLocalEventInterests(new EventConnectorFactory(Handler.class),
Event.class);

Best regards.

--
Thelmo