Re: Servlet

You can do one of a couple things...even both at the same time...

in web.xml...

     <servlet>
         <servlet-name>ApplicationGateway</servlet-name>
         <servlet-class>org.enhydra.barracuda.contrib.dbroggisch.examples.controller.DBRApplicationGateway</servlet-class>
         <init-param>
             <param-name>ApplicationAssembler</param-name>
             <param-value>org.enhydra.barracuda.core.event.DefaultApplicationAssembler</param-value>
         </init-param>
         <init-param>
             <param-name>AssemblyDescriptor</param-name>
             <param-value>/WEB-INF/event-gateway.xml</param-value>
         </init-param>
         <init-param>
             <param-name>SAXParser</param-name>
             <param-value>org.apache.xerces.parsers.SAXParser</param-value>
         </init-param>
         <load-on-startup>3</load-on-startup>
     </servlet>


in DBRApplicationGateway....

     public void initializeLocal() {
         specifyEventGateways(new RenderPageEventGateway());

     }


in event-gateway.xml...

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

<assemble>

<!-- You can turn on URL rewriting by uncommenting this out
     <constant class="org.enhydra.barracuda.plankton.http.URLRewriter" 
name="REWRITE_URLS">true</constant>
-->

     <event-gateway 
class="org.enhydra.barracuda.core.event.DefaultEventGateway">
         <event-gateway 
class="org.enhydra.barracuda.contrib.dbroggisch.examples.controller.ExampleGateway" 
/>
     </event-gateway>

</assemble>


So, we've added both RenderPageEventGateway and ExampleGateway as 
sub-gateways of the custom DBRApplicationGateway.



You can also add subgateways to your event gateways like this...

In BarracudaConfig (which is an event gateway)....

     public BarracudaConfig() {
         ...
         ...
         ...
         //add in sub-gateways
         this.add(new CompConfig());
         this.add(new DataConfig());
         this.add(new DomConfig());
         this.add(new EventConfig());
         this.add(new FormsConfig());
         this.add(new UtilConfig());
         this.add(new ViewConfig());
         this.add(new MasterConfig());
     }

or this (in an event-gateway.xml)....

<event-gateway class="org.enhydra.barracuda.core.event.DefaultEventGateway">
         <event-gateway class="com.mypackage.MySubEventGateway1" />
         <event-gateway class="com.mypackage.MySubEventGateway2" />
         <event-gateway class="com.mypackage.MySubEventGateway3" />
</event-gateway>


So, you can do everything in application gateway and/or event gateway 
classes or do everything in the event-gateway.xml file read in by the 
application assembler.  The advantage of doing the former is compile-time 
assurance that your application is set up right.  The advantage of the 
former is ease of configuration and the ability to mix and match event 
gateways and/or event handlers without recompiling anything.

Does that help?

You might also want to read the 30,000 foot overview and the other docs on 
the event model:
http://barracudamvc.org/Barracuda/index_details.html


Jake


At 10:11 AM 4/4/2003 -0500, you wrote:
>Yes, now I see ApplicationGateway has a method
>
>public final void add(EventGateway eg)
>
>Where are the codes that actually 'add' all
>'DefaultEventGateway's?
>
>Maybe I should ask differently.
>
>Each specific DefaultEventGateway contains main
>information of MVC for each page. I just want to
>understand the code flow how the servlet treats these
>DefaultEventGateway's step by step.
>
>
>Thanks,
>
>Xue-Feng
>
>
>  --- Jacob Kjome <[email protected]> wrote: >
> > Are you wondering about the ApplicationGateway?
> > That extends
> > HttpServlet.  You add event gateways to the
> > application gateway.
> >
> > Jake
> >
> > At 07:34 PM 4/3/2003 -0500, you wrote:
> > >Hi Jack,
> > >
> > >I guess that DefaultEventGateway should be comsumed
> > by
> > >some servlet. Could you please tell me which
> > servlet
> > >consumes the class which entends
> > DefaultEventGateway?
> > >Or correct me.
> > >
> > >Xue-Feng
> > >
> > >
> > >
> >
> >______________________________________________________________________
> > >Post your free ad now! http://personals.yahoo.ca
> > >_______________________________________________
> > >Barracuda mailing list
> > >[email protected]
> > >http://barracudamvc.org/lists/listinfo/barracuda
> >
>
>______________________________________________________________________
>Post your free ad now! http://personals.yahoo.ca
>_______________________________________________
>Barracuda mailing list
>[email protected]
>http://barracudamvc.org/lists/listinfo/barracuda