Here's something a little perplexing that I discovered by trial and error:
if you reload (using require :reload) a clj file containing a deftype
implementing clojure interfaces (e.g. ISeq, etc.) plus some functions, the
functions will be reloaded but not the deftype implementation code. That
is, the clj file will be reloaded, but changes in the deftype
implementation code will not take effect.
But if you use gen-interface (in another file, aot-compiled) to create your
interface using your own namespace, and then list that custom interface
(rather than the clojure interfaces) in the deftype, then the
implementation code gets reloaded. I don't really see why this is so, and
haven't found any relevant documentation. Can anybody explain what's
happening behind the curtain?
Note: I'm running this on the Gooble AppEngine dev server, but I shouldn't
think that makes any difference.
Thanks,
-Gregg
Example:
A. This does not support code reloading for the deftype implementation
code:
;; in foo/bar.clj:
(ns foo.bar...)
... other functions...
(deftype baz
clojure.lang.Seq
(first [_] ...)
(next [_] ...)
....)
B. This does support reloading of the detype:
;; in some/other/namespace.clj:
(ns some.other.namespace ...)
(gen-interface :name foo.bar.Baz
:extends [clojure.lang.Seq ...]
...)
;; in foo/bar.clj:
(ns foo.bar ...)
... other functions ...
(deftype baz
foo.bar.Baz
... implementations as before ...
)
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