Re: global object

Already done!

----- Original Message -----
From: "Malcolm Edgar" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Sunday, January 12, 2003 2:56 AM
Subject: Re: [Tapestry-contrib] 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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