Anybody, any advice?
jeffrey ai wrote:
>
> Hi Folks,
>
> We have a need to provide personalized page for different user groups, so
> I tweaked some T5 services to make it possible to use personalized
> template based on a request parameter.
>
> I would like put the general idea here in case you guys are interested.
> Also since I have change some T5 internal services, I am wondering whether
> I have missed something. Your advice are quite welcome.
>
> Basically, I decorated 2 T5 internal services -- ComponentTemplateSource
> and PagePool.
> * ComponentTemplateSource is responsible to look up templates, so I have
> changed it to request-aware and load template based on the user group.
> * PagePool is responsible to pool pages, so I have changed it to
> request-aware too and pool pages based on user group.
>
> Although I used T5 decorator facility to intercept calls to both services,
> it's not real decorating behavior as defined in GoF pattern. My decorators
> will handle all calls, they won't even pass calls to decoratees -- the
> original services. I am a little concerned whether my tweak would have
> some side effects.
>
> ---------- Code Snippet of my AppModule.java
> public ComponentTemplateSource decorateComponentTemplateSource(
> Class<ComponentTemplateSource> serviceInterface, Object
> delegate,
> String serviceId, Logger logger,
> TemplateParser parser, PageTemplateLocator locator,
> RequestGlobals
> requestGlobals )
> {
> final MyComponentTemplateSourceImpl service = new
> MyComponentTemplateSourceImpl(
> parser, locator, requestGlobals );
>
> _updateListenerHub.addUpdateListener( service );
>
> return service;
> }
>
> public PagePool decoratePagePool( Class<PagePool> serviceInterface,
> Object delegate, String serviceId,
> Logger logger, PageLoader pageLoader, ThreadLocale
> threadLocale,
> ComponentClassResolver resolver,
> RequestGlobals requestGlobals, ThreadString
> threadString,
> ComponentMessagesSource componentMessagesSource,
> ComponentTemplateSource componentTemplateSource )
> {
> final MyPagePoolImpl service = new MyPagePoolImpl( logger,
> pageLoader,
> threadLocale,
> resolver, requestGlobals, threadString );
>
> // This covers invalidations due to changes to classes
>
> pageLoader.addInvalidationListener( service );
>
> // This covers invalidation due to changes to message catalogs
> (properties files)
>
> componentMessagesSource.addInvalidationListener( service );
>
> // ... and this covers invalidations due to changes to templates
>
> componentTemplateSource.addInvalidationListener( service );
>
> return service;
> }
> ----------
>
> Thanks for any advice.
> Jeffrey Ai
>
>
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