Re: [T4.1] Chained PageRedirectException doesn't seem to be working for me

[Jim <op...@gmail.com>]

Thanks for the tip, Andreas, but three problems:
  * pageValidate(..) does not have access to the rewind-phase.  
Sometimes there is work I only want to do -- or /not/ do -- in this 
phase, and I lose that control.
  * pageValidate(..) on PageA is called even when it's just a 
@DirectListener being called from PageA
  * pageValidate(..) on PageA is called when PageA is merely injected 
into another page, even if PageA is never actually used.

Those latter two issues are, obviously, slowing my application down.

So .. if not pageBeginRender(..) (because I can't do exception-possible 
work because I can't send the user to an ad hoc page via 
PageRedirectException) or pageValidate(..) (because it's called in two 
places where the page isn't actually ultimately rendered), I'm confused 
as to where I do the work to initialize a page with everything its 
template needs to display.  I want all this logic encapsulated in the 
page itself, and not spread out to every page-listener that could 
forward to it.

Currently, I have page-listeners call an initializePage(..) method on 
the target page, which merely sets a few properties that my 
pageBeginRender/pageValidate methods would use to query all the 
necessary information out, and then the page-listener returns the 
initialized page for rendering.  I think my plan now is to refactor all 
those initialization methods to do all the query-work themselves, and 
then return either the target page, or an initialized error page, which 
the page-listener will in turn return for rendering.  That would 
gracefully handle the latter two issues above, but initialization work 
specific to the rewind phase is still lost to me.

Thanks,
Jim


Andreas Andreou wrote:
> See the PageValidateListener interface
>
> Implement that and move the redirect logic into
> void pageValidate(PageEvent event);
>
> On Wed, Aug 20, 2008 at 1:24 PM, Jim <op...@gmail.com> wrote:
>   
>> Hello,
>>
>> I have PageA throwing a PageRedirectException to PageB in its
>> pageBeginRender, and PageB throwing a PageRedirectException to PageC in its
>> pageBeginRender.  However, PageB's PageRedirectException is resulting in the
>> Tapestry exception-page, without trying to render PageC -- the
>> exception-report lists only "org.apache.tapestry.PageRedirectException" and
>> its stacktrace as the problem.
>>
>> My expectation was that Tapestry would keep passing the baton from page to
>> page until one rendered -- is that not the intention?
>>
>> Here's the stacktrace below where the PageRedirectException was thrown:
>>
>> org.apache.tapestry.AbstractPage.firePageBeginRender(AbstractPage.java:409)
>> org.apache.tapestry.AbstractPage.renderPage(AbstractPage.java:244)
>> org.apache.tapestry.engine.RequestCycle.renderPage(RequestCycle.java:400)
>> org.apache.tapestry.services.impl.DefaultResponseBuilder.renderResponse(DefaultResponseBuilder.java:159)
>> org.apache.tapestry.services.impl.ResponseRendererImpl.renderResponse(ResponseRendererImpl.java:33)
>> $ResponseRenderer_11bdf8e6cf5.renderResponse($ResponseRenderer_11bdf8e6cf5.java)
>> org.apache.tapestry.engine.AbstractEngine.renderResponse(AbstractEngine.java:201)
>> org.apache.tapestry.engine.AbstractEngine.handlePageRedirectException(AbstractEngine.java:329)
>> org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:245)
>> org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:54)
>> $WebRequestServicer_11bdf8e6d3d.service($WebRequestServicer_11bdf8e6d3d.java)
>> org.apache.tapestry.services.impl.DisableCachingFilter.service(DisableCachingFilter.java:54)
>> $WebRequestServicerFilter_11bdf8e6d3f.service($WebRequestServicerFilter_11bdf8e6d3f.java)
>> $WebRequestServicer_11bdf8e6d41.service($WebRequestServicer_11bdf8e6d41.java)
>> $WebRequestServicer_11bdf8e6d39.service($WebRequestServicer_11bdf8e6d39.java)
>> org.apache.tapestry.services.impl.WebRequestServicerPipelineBridge.service(WebRequestServicerPipelineBridge.java:61)
>> $ServletRequestServicer_11bdf8e6d1d.service($ServletRequestServicer_11bdf8e6d1d.java)
>> org.apache.tapestry.multipart.MultipartDecoderFilter.service(MultipartDecoderFilter.java:52)
>> $ServletRequestServicerFilter_11bdf8e6d1f.service($ServletRequestServicerFilter_11bdf8e6d1f.java)
>> $ServletRequestServicer_11bdf8e6d21.service($ServletRequestServicer_11bdf8e6d21.java)
>> org.apache.tapestry.services.impl.SetupRequestEncoding.service(SetupRequestEncoding.java:53)
>> $ServletRequestServicerFilter_11bdf8e6d1b.service($ServletRequestServicerFilter_11bdf8e6d1b.java)
>> $ServletRequestServicer_11bdf8e6d21.service($ServletRequestServicer_11bdf8e6d21.java)
>> org.apache.tapestry.request.DecodedRequestInjector.service(DecodedRequestInjector.java:55)
>> $ServletRequestServicerFilter_11bdf8e6d19.service($ServletRequestServicerFilter_11bdf8e6d19.java)
>> $ServletRequestServicer_11bdf8e6d21.service($ServletRequestServicer_11bdf8e6d21.java)
>> $ServletRequestServicer_11bdf8e6d13.service($ServletRequestServicer_11bdf8e6d13.java)
>> org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:126)
>> org.apache.tapestry.ApplicationServlet.doGet(ApplicationServlet.java:103)
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
>> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
>> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
>> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
>> java.lang.Thread.run(Thread.java:810)
>>
>> Thanks,
>> Jim
>>
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>>     
>
>
>
>   


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