Hi Leonardo, thanks for your quick reply. I'm following the idea of "stateless JSF" but adapted to my particular scenario. I have read the discussion and based on your classification of views, my views are "static views".
So, my implementation is based on pooling component tree instances and reuse it for render the same view on different requests. In my fist tests, this have improved the performance on +400% on hits per second. I'm using a custom ViewHandler to manage that pool. In method createView() I check if there is an instance already pooled for the requested view, if so return it, and if not use de standard ViewHandler to create a new one. But the problem I have found is that I cannot differentiate (in a standard way, suitable for any implementation of JSF) when this method (ViewHandler.createView()) is called for the "real-view" or for the "metadata-view". Un saludo, Jesús Pérez Alcaide Lab. Banksphere - Runtime Tlf: 91 470 5223 -----Mensaje original----- De: Leonardo Uribe [mailto:[email protected]] Enviado el: miércoles, 14 de marzo de 2012 19:58 Para: MyFaces Development Asunto: Re: Question about DefaultFaceletsStateManagementStrategy Hi 2012/3/14 PEREZ ALCAIDE JESUS <[email protected]>: > Hello, > > > > I'm creating a custom ViewHandler in order to cache the component tree > whenever is possible. I'm following the idea of "stateless JSF" to improve > performance. > Ok. Please be sure to read the latest discussion about this topic: http://markmail.org/message/24sbs2ltnrql7swz?q=[core]+discussion+about+stateless+jsf+implementation > > > My question is about DefaultFaceletsStateManagementStrategy.restoreView() > method. In this method, you are calling ViewMetadata.createMetadataView() > which ends up calling ViewHandler.createView to create the UIViewRoot used > for metadata and a ViewMetadataFacelet to populate it. > > > > But this UIViewRoot (created for metadata) is used later to build the 'real' > view. Why? > That is for performance reasons. Suppose a request is received with some query params. To process them, it is only necessary to build the metadata and then if a navigation occur by some condition, the new view can be build, preventing the overhead associated with build the first view. > I think that a new UIViewRoot should be created for the real view, because > metadata-view and real-view use different Facelets to populate the view. > > > > Also, in the method DefaultFaceletsStateManagementStrategy.restoreView() you > are calling the static method ViewMetadata.getViewParameters(UIViewRoot) on > an instance of ViewMetadata (I think this should be fixed) and the > Collection of UIViewParameters returned is not processed. > > That's by JSF 2.0 spec. > > I wonder if ViewMetadata should be used in this method. I cannot see any > processing related to metadata happening here. > > It should be, because if we don't Partial State Saving algorithm will break. The view should be build on restoreView just like the first time + update the "delta" information. > > Hope you have understood me. > > Yes, from my side, I can read the mail without problem. The idea proposed in "stateless JSF" is feasible, but it requires some changes like: - Use ConcurrentHashMap/ConcurrentLRUCache instead synchronized blocks. - Use buildView instead clone the view to generate a new one. - Use a combination of viewId/deriveLogicalViewId() Suggestions and contributions are welcome. regards, Leonardo Uribe > > > > Un saludo, > > > > Jesús Pérez Alcaide > > Lab. Banksphere - Runtime > > Tlf: 91 470 5223 > > > > > > > *********************AVISO LEGAL ********************** > Este mensaje es privado y confidencial y solamente para la persona a la que > va dirigido. Si usted ha recibido este mensaje por error, no debe revelar, > copiar, distribuir o usarlo en ningún sentido. 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