I'd like to thank everyone for their advice. I'm going to definitely explore the Racket's webserver and step back and look at existing Rack middleware implementations to determine if I can use a different construct besides hash-manipulations.
-- Chad On Tue, May 15, 2012 at 8:23 PM, Robby Findler <ro...@eecs.northwestern.edu> wrote: > I guess you probably need to step back and understand how things tend to > mutate this hash and look for another construct that more accurately > captures the interesting use cases for mutating the hash. That is, hash > mutation is a kind of do-anything assembly language and until you have a > good handle on what "anything" might be in the usual case, then you can > design a construct to replace it. (Also, you will find that there are > invariants that you can express too, and even check when you move away from > the hashs (I hope).) > > My $0.02, > Robby > > On Tuesday, May 15, 2012, Chad Albers wrote: >> >> Hi, >> >> I'm working on project to port the Ruby Rack framework to Racket scheme. >> If you're not familiar with Rack, it creates a layer to manage the http >> response/requests, and a level of abstraction to build a chained list of >> middle ware clients - each calling the next in chain. >> >> Switching from from Ruby's OOP paradigm to Scheme's more functional >> paradigm, a problem has presented itself that I would like some advice on. >> >> In the Rack middleware in the chain, each piece of the middleware receives >> a hash which encapsulates the response/requests, and the middleware mutates >> this hash depending on the functionality it adds. >> >> I could port this hash exchange in my Racket implementation, but I have an >> aversion to the side effects inherently in mutating this hash. My >> question, then, is does anyone have a more functional approach to how I >> could implement this middleware chain? >> >> Any advice anyone could offer would be greatly appreciated. I'm going to >> open sourcing the project soon. >> -- >> Chad >> > ____________________ Racket Users list: http://lists.racket-lang.org/users
