RE: Pipeline example

Tue, 28 Feb 2006 23:49:25 -0800

Title: Message
Yes, you do want pipelines ;)
 
 
Just implement ListenerInvokerFilter like that:
 
public class TransactionFilter implements ListenerInvokerFilter {
 
 private PersistenceService svc;
 private Log log;
 
 public TransactionFilter( PersistenceService s ) {
  svc = s;
 }
 
 public void setLog( Log l ) {
  log = l;
 }
 
 public void invokeListener(IActionListener listener, IComponent component,
   IRequestCycle cycle, ListenerInvoker invoker) {
  
  try {
   log.debug("about to invoke " + listener );
   invoker.invokeListener( listener, component, cycle );
   log.debug("committing ... ");
   svc.commit();
  } catch (RuntimeException e) { //TODO treat StaleObjectException separately
   svc.rollback();
   throw e;
  }
  
 }
 
}
 
and wire it up like this:
 

<service-point id="ListenerFilter" interface="org.apache.tapestry.services.ServletRequestServicerFilter">

<invoke-factory>

<construct class="your.package.TransactionFilter" />

</invoke-factory>

</service-point>

<contribution configuration-id="tapestry.listener.ListenerInvoker">

<filter name="ListenerFilter" object="service:ListenerFilter"/>

</contribution>

 

hth

-----Original Message-----
From: Carpenter, Scott [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 01, 2006 7:40 AM
To: [email protected]
Subject: RE: Pipeline example

Yes, I did read that article and, to me, interceptors sound alot like pipelines. The whole idea for pipelines came from a suggestion by HLS in the link below which was originally submitted by another member of our team.
-----Original Message-----
From: James Carman [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 28, 2006 7:08 PM
To: [email protected]
Subject: RE: Pipeline example

Have you looked into interceptors?  I talk about them in my article.  I think that's what you want here.  At least, it sounds like it

 

http://www.theserverside.com/articles/article.tss?l=HivemindBuzz

 

 

 

From: Carpenter, Scott [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 28, 2006 7:21 PM
To: [email protected]
Subject: Pipeline example

 

I am new to Hivemind and Tapestry and have been reading the documentation. I believe I want to use Pipelines to secure certain methods in an application - specifically to receive an event before and after Tapestry's ListenerMap invokes the listener method. That way we can implement method-level security access control on individual actions for each page. A pipeline example would really help get me started. Thanks.

 

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