On Wed, Mar 4, 2009 at 7:59 AM, debasish <[email protected]> wrote:
> > Dear All - > > I have had a look at Lift quite some time ago. I remember referring to > this excellent post by David Pollak on the usage of actors in Lift > (http://blog.lostlake.org/index.php?/archives/59-How-lift-uses-Scala- > actors.html). Now that I am looking at the code base after quite some > time, I find lots of changes in it. e.g. the above post refers to > implementation of Session, Page, Controller etc. as Scala actors that > nicely interacts in the Request / Response cycle of Lift. But the > latest snapshot from Github indicates that the usage of actors in Lift > is now different. Is there any document or pointer that describes the > rationale of this change or explains the current usage of actors in > request / response processing ? Howdy, As Lift evolved and I did performance analysis, I found that the places where Actors were used were not necessary, added complexity to the code, and had adverse performance characteristics. For example, as I added more methods to LiftSession, I found that it became increasingly difficult to choose between "methods" and "messages". The problem became acute when Snippets and things external to LiftSession had to access LiftSession's state during the servicing of a request. LiftSession needed public methods, but those exposed state and thus the Actor model broke down. Yes, I could have created a "CurrentLiftSessionState" object that was exposed only to the current request via S (the thread-local state), but that seemed to be way too complex. So, at this point, Actors are used for CometActors and to help service Comet requests (event-based actors are used to suspend the long poll.) Does this help? Thanks, David > > > Thanks. > - Debasish > > > > -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Lift" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~----------~----~----~----~------~----~------~--~---
