So lets look at some artifacts then. I think we need an interface that all
composites implement:
(definterface Composite
(compositeMap []))
The function composite-map returns the map which holds the aggregated
functions and data.
Now lets look at a sample function, blip:
(def blip [^Composite this x y z] ((:blip (.compositeMap this)) this x y z))
and a protocol that includes blip:
(defprotocol gran
(blip ^Composite this x y z))
Next we define a type which will hold an aggregate that includes an
implementation of blip:
(deftype wackel [my-map]
Composite
(defn compositeMap [_] my-map))
and a function to create an instance of that type:
(defn new-wackel [this opts] (assoc opts :blip (fn [this x y z] (+ x y z)))
Finally, we can extend our type with the protocol:
(extend wackel
gran
{:blip blip})
I find this uncomfortable. In Rich's terms this is simple but hard. To be
expected, as it is a major decomplection. But it will take me a while to
get comfortable with this. :-(
--b
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