Re: global object

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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