Re: Migration to Tap4, accessing the hivemind registry without injection

Fri, 09 Feb 2007 11:55:24 -0800 

Thanks Ben,
I am going to try, I find it a bit of hack. And I find strange that there is no access to the registry. 

Thanks

Numa
Le 9 févr. 07 à 20:24, Ben Dotte a écrit :


I'm not sure if there is a more straightforward way, but one way is  
to store the servlet into the request and then pull out the  
ServletContext from that.


So make a subclass of org.apache.tapestry.ApplicationServlet:
public class MyApplicationServlet extends ApplicationServlet
{

	protected void doService(HttpServletRequest request,  
HttpServletResponse response) throws IOException, ServletException

        {
                request.setAttribute("servlet", this);
                super.doService(request, response);
        }
}

Set it up in web.xml:
<servlet>
        <servlet-name>app</servlet-name>
        <servlet-class>path.to.MyApplicationServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
</servlet>

Then pull out the registry in your base page:
public Registry getRegistry()
{

	return (Registry) ((MyApplicationServlet) getRequestCycle 
().getInfrastructure().getRequest().getAttribute 
("servlet")).getServletContext().getAttribute 
("org.apache.tapestry.Registry:app");

}

Ben

-----Original Message-----
From: Numa Schmeder [mailto:[EMAIL PROTECTED]
Sent: Friday, February 09, 2007 1:08 PM
To: Tapestry users

Subject: Re: Migration to Tap4, accessing the hivemind registry  
without injection


I knew that, but I don't know how to access a context from a Page or
from the request cycle.
How can you get the servlet context?

Thanks,

Numa
Le 9 févr. 07 à 19:49, Shing Hing Man a écrit :


A singleton has the advantage of letting you access
the registry in non-web pages.
In case you did not know,
the registry is created in the  ApplicationServlet and
stored as a context parameter.

// context is the servlet context
Registry registry = (Registry) context

.getAttribute(ApplicationServlet.REGISTRY_KEY_PREFIX_PUBLIC
                                                +
"(the name of ApplicationServlet given in web.xml");


Shing


--- Numa Schmeder <[EMAIL PROTECTED]> wrote:


Nop, but isn't an easier way to just access the
registry?

Le 9 févr. 07 à 19:33, Shing Hing Man a écrit :


Have you considered implementing the HiveMind

registry

as a singleton ?

The zebra-hivemind subproject in Zebra does

exactly

that.
http://zebra.berlios.de/

Shing




--- Numa Schmeder <[EMAIL PROTECTED]> wrote:


Hello,

I am migrating an application from tap3 to tap4,

I

am hitting a lot
of problem.
One of those is getting a reference to the

hivemind

registry from
java without using injection.

I have a base page who used to provide a

DAOFactory

to all my
subclassing pages, now the DAOFactory is in the
hivemind registry.
I don't want to go to each page specification to
inject the DAO
Factory and I can't use annotations.  So I would
like to access the
hivemind registry programmatically.
How can I do, I have checked many docs but

couldn't

find a clue.

Could someone help me please!

Thanks

Numa







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