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
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