why not multimethods? Saludos, Nahuel Greco.
On Fri, Aug 22, 2014 at 1:30 PM, Laurens Van Houtven <[email protected]> wrote: > Hi Clojurers, > > > I'm writing a capability system with Clojure. Make a request to a URL, it > grabs the "plan" for what it should do from the database. A plan consists > (eventually) of atomic "steps". Typical example of a step would be "make an > HTTP request", represented by a map like {:type :http :url " > http://www.example.test"; :method "GET"}. > > I would like to allow people to implement different types of steps (http, > delays, e-mail, ftp...), ideally by modifying as little existing code as > possible. Step implementations have two parts: > > - a step handler (better name suggestions welcome...): a function that > takes a step map of the appropriate type, producing a channel that will > eventually have a result posted on it and be closed > - a step schema (a prismatic/schema schema), describing the step map. > > Right now I manage both of these manually. That works fine, because the > only thing I've implemented so far is HTTP requests ;-) > > I briefly considered protocols for this; perhaps a protocol with a handler > fn and the schema, but AFAIK protocols only know about their extenders, not > so much about their implementations. (Even with manual registration, a > protocol may still be an appropriate tool.) Plus, that wouldn't solve the > problem of dispatching based on type (i.e., given a map like the example > above, find the handler function that can do something with it). > > This project is in its earliest stages, so I am very eager to hear about > wildly different suggestions as well :) > > > thanks in advance > lvh > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
