Re: global object

It's fairly recent, based on suggestions by Geoff.

----- Original Message -----
From: "Malcolm Edgar" <[email protected]>
To: <tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Sent: Saturday, January 11, 2003 4:42 PM
Subject: Re: [Tapestry-contrib] global object


> I never even knew that the extension stuff existed. Yes, it sounds idea
for
> the job. I think global will be a great place for sticking EJB stuff.
>
> regards Malcolm
>
> >From: "Howard M. Lewis Ship" <[email protected]>
> >To: "Malcolm Edgar"
> ><[email protected]>,<[email protected]>
> >Subject: Re: [Tapestry-contrib] global object
> >Date: Fri, 10 Jan 2003 06:59:07 -0500
> >
> >Yes, but those things could also be done using <extension> beans in the
app
> >spec and setting the immediate flag on.  Then the Global object could
exist
> >to simplify access to those objects.
> >
> >Actually, I've been picturing the Global object as the place where you
> >stick
> >your EJB home and remote interfaces.  If you look at the Vlib, it does
this
> >using variables on the VlibEngine, and includes some retry logic that
sets
> >them back to null on a RemoteException; this the Vlib is very good at
> >riding
> >out JBoss restarts (when the Vlib is not running within JBoss).
> >
> >----- Original Message -----
> >From: "Malcolm Edgar" <[email protected]>
> >To: <tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> >Sent: Friday, January 10, 2003 3:05 AM
> >Subject: Re: [Tapestry-contrib] global object
> >
> >
> > > One advantage of initializing the global in the Servlet.init() is that
> >it
> >is
> > > done when the servlet is loaded, this may be an advantage in
> >instantiating
> > > heavy weight or time consuming global objects (e.g. loading a
> >database/LDAP
> > > cache or setting a connection pool) rather than doing initializing
when
> >the
> > > ApplicationServlet/Engine is first hit.
> > >
> > > regards Malcolm
> > >
> > > >From: "Malcolm Edgar" <[email protected]>
> > > >To: [email protected], [email protected]
> > > >Subject: Re: [Tapestry-contrib] global object
> > > >Date: Fri, 10 Jan 2003 15:56:53 +0800
> > > >
> > > >Hi Howard,
> > > >
> > > >Yeah I don't mind if you move the global initialization out of
> > > >ApplicationServlet into AbstractEngine and have it place it in the
> > > >ServletContext, this would remove global code from ApplicationServlet
> >and
> > > >RequestContext.
> > > >
> > > >I think I was still thinking in terms of Servlets and initializing
> >stuff
> >in
> > > >init().
> > > >
> > > >I think you will need to initialize global in setupForRequest() as it
> >has
> > > >access to ServletContext. I would make the global servlet context
> >attribute
> > > >key constant public so that JSP code can reference it.
> > > >
> > > >Regards Malcolm
> > > >
> > > >>From: "Howard M. Lewis Ship" <[email protected]>
> > > >>To: "Tapestry Contrib" <tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> > > >>Subject: [Tapestry-contrib] global object
> > > >>Date: Thu, 9 Jan 2003 21:14:06 -0500
> > > >>
> > > >>I would like to discuss the global property added to IEngine.
> > > >>
> > > >>I would like to see the solution fleshed out a little bit.
> > > >>
> > > >>What I see is that, if there's a particularily named object in the
> >servlet
> > > >>context, it is accessible from the IEngine.  I  have to assume the
> >intent
> > > >>was to override ApplicationServlet.init() to provide Global.  This
is
> >a
> > > >>bit different than how many other similar constructs, such as Visit,
> >are
> > > >>implemented.
> > > >>
> > > >>I would like to see:
> > > >>
> > > >>1) An overridable method on AbstractEngine to create the Global.
> > > >>2) A default implementation of getGlobal that checks for the Global
in
> >the
> > > >>servlet context and, if not present, creates and stores it into the
> > > >>servlet context.
> > > >>3) A default implementation of createGlobal() that uses an app-spec
> > > >>property to define the name of the class to instantiate (i.e., same
> > > >>pattern as Visit).
> > > >>
> > > >>Basically, Global should be just like Visit, except shared by all
> > > >>sessions/engines.
> > > >>
> > > >>Because creating and storing the Global will not force the creation
of
> >a
> > > >>HttpSession, it should be done from setupForRequest(), like the many
> >other
> > > >>shared objects (page source, template source, etc.).
> > > >>
> > > >>I don't see that the Global should be any part of RequestContext.
> > > >>
> > > >>I like the idea of Global; I'm increasingly enamored of solutions
that
> > > >>leverage aggregation instead of inheritance.
> > > >>
> > > >>I can whip my ideas together in a few minutes; I just wanted to see
> >what
> > > >>Malcolm thinks of the changes.
> > > >>
> > > >>----
> > > >>Howard Lewis Ship
> > > >>[email protected]
> > > >>http://tapestry.sf.net
> > > >>
> > > >
> > > >
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