Re: 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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