You aren't missing anything. Upgrade to the latest Beta-9 build, the
ServletContext wasn't available originally (but was "requested" that it be
added). Then just inject it as a service, like you would a WebRequest (it
might be available via infrastructure:, but I haven't looked).
----- Original Message -----
From: "Greg Ward" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, September 30, 2005 3:51 PM
Subject: Tapestry 4 migration: how to initialize a Global object?
I'm trying to migrate a Tapestry 3 app to Tapestry 4. My first
stumbling block is initializing (not creating) my Global object. Under
Tapestry 3, our app initializes itself like this:
* our ServletContextListener stuffs various interesting objects into
the ServletContext (e.g. a Configuration object, the log filename,
application version string -- stuff that should be setup in the
ServletContextListener)
* we provide a custom Engine class that overrides createGlobal();
it's happy to let Tapestry create the Global object
with "new Global()", but that does not result in a usable object --
we have to copy stuff from the ServletContext into the Global object:
protected Object createGlobal( RequestContext requestContext )
{
Global global = (Global) super.createGlobal( context );
ServletContext context =
requestContext.getServlet().getServletContext();
global.init(
(Configuration) context.getAttribute(
Constants.CONFIGURATION_ATTR ),
ContextListener.getNotifier( context ),
(String) context.getAttribute( Constants.PROJECT_NAME_ATTR ),
(String) context.getAttribute( Constants.PROJECT_VERSION_ATTR ),
(String) context.getAttribute( Constants.LOG_BASENAME_ATTR ) );
return global;
}
I'm absolutely clueless how to do this in Tapestry 4. I've gotten as
far as creating hivemodule.xml and asking HiveMind to kindly instantiate
one of our Global objects rather than a HashMap ... but then how the
heck do I initialize it? I can't do it from the ServletContextListener,
because that runs before Tapestry/HiveMind ever enter the picture. But
everywhere I try to hook in to Tapestry, I can't see how to get my hands
on a ServletContext -- everything's hidden behind WebRequest, and
there's no apparent way to get from a WebRequest to a ServletContext.
Argh! What am I missing?
Thanks --
Greg
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