Or is this a better method, using the Listener in Servlet 2.4 rather than
the filter in Servlet 2.3
<listener>
<listener-class>org.objectstyle.cayenne.conf.WebApplicationContextProvider</listener-class>
</listener>
Sample DataContext retrieval code:
import org.objectstyle.cayenne.access.DataContext;
...
// get session DataContext bound to the current request thread
DataContext context = DataContext.getThreadDataContext();
What are the advantages.
From: "Cypher her" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: RE: accessing cayenne sessions
Date: Tue, 04 Apr 2006 22:36:53 +0000
Hi
I am using Tapestry 4, Java 1.5, JBoss 4 and Cayenne 1.2.
So if I undrstand you correctly I can create a subclass of BasePage which
will have a getSession() method. But in that page, to get the session I
would need to use the WebApplicationContextFilter and do something like
add his to my web.xml
<filter>
<filter-name>CayenneFilter</filter-name>
<filter-class>org.objectstyle.cayenne.conf.WebApplicationContextFilter</filter-class>
</filter>
...
<filter-mapping>
<filter-name>CayenneFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
and create a class like this
import org.objectstyle.cayenne.access.DataContext;
public class MyBasePage extends BasePage
{
public DataContext getDataContext()
{
return DataContext.getThreadDataContext();
}
}
and all of my pages should subclass MyBasePage. And I am assuming Tapestry
and the servlet container will take care of making sure the Session is
consistent throughout the workflow i.e. each user gets a unique DataContext
and they maintain the same DataContext from page to page until the session
times out..
Thanks again for your help.
Lawrence
From: "Gentry, Michael (Contractor)" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: <[email protected]>
Subject: RE: accessing cayenne sessions
Date: Tue, 4 Apr 2006 10:45:29 -0400
Yes, but using Tapestry you can have a common superclass for your pages
that provides a getSession() method and it works transparently. You
don't need to think about Http*.
/dev/mrg
-----Original Message-----
From: Mike Kienenberger [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 04, 2006 10:26 AM
To: [email protected]
Subject: Re: accessing cayenne sessions
On 4/4/06, Cyp her <[EMAIL PROTECTED]> wrote:
> * Are there any convenient methods for accessing the Session like in
> WebObjects where there is a session class in the application?
In servlets, there's an HttpSession object that you can pull out of
the HttpServletRequest. Instead of being a subclassable object, it
instead holds references to a Map (think NSDictionary) where you can
store objects the entire session. How you get a reference to your
HttpSession object depends on the framework.
http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/Http
Session.html
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