Re: global object

Howard,

would you mind making this change. I am a bit time impovished at the moment 
(house renovations), and I dont want to hold up the T2.3 release.

regards Malcolm

>From: "Howard M. Lewis Ship" <[email protected]>
>To: "Malcolm Edgar" 
><[email protected]>,<[email protected]>
>Subject: Re: [Tapestry-contrib] global object
>Date: Sat, 11 Jan 2003 17:49:54 -0500
>
>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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