Re: Servlet

Are there easy ways to extend these GateWay's? If yes,
what rules should I follow?

Xue-Feng

 --- Jacob Kjome <[email protected]> wrote: > 
> 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
> > > >
> > > >
> > > >
> > >
> >
>
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> > >
> >
>
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>  

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