Hello,
I have an app which specifies a protocol and a record name. At runtime, it
searches the classpath for files implementing the specification and creates
a map of namespace to instance for each. Before I implemented the protocol,
I just specified function names. I was able to lookup the function names
and call them. After I switched to using a protocol, I get a
CompilerException.
Here's the question: How do I instantiate a known record from an unknown
namespace?
Here is the sample code. Thanks for you help.
```clojure
(ns proto)
(defprotocol Proto
(meth [this]))
;; use clojure.tools.namespace.find to locate the namespace.
;; for simplicity, we just def it here.
(def that 'rec)
(require that)
;; the symbol "Rec" is part of the specification
(let [inst (ns-resolve that (symbol "Rec"))]
(when (class? inst)
(println "inst:" (type inst) inst)
;; => java.lang.Class rec.Rec
(println "meth:" (meth (new rec.Rec)))
;; => it works when I know it.
;; uncomment this for a CompilerException
;;(println "meth:" (meth (new inst)))
;; => CompilerException java.lang.IllegalArgumentException:
;; Unable to resolve classname: inst, compiling:(proto.clj:21:28)
))
```
```clojure
(ns rec
(:require proto))
(defrecord Rec []
proto.Proto
(meth [this] "it works when I know it"))
```
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