Kevin and Phil nice work.
Now if only object returned by fn had implemented Serializable and
custom serialization functions which were doing:
private void writeObject(ObjectOutputStream out) throws IOException
{
(with-out-str
(print (pr-str this)))
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
(eval (read-string in))
}
some simple expressions could be already transmited.
Also fn could be named somehow more declarative like sfn to highlight
this overhead.
Almost there!!!
On 11 Maj, 20:12, Phil Hagelberg <[email protected]> wrote:
> On Tue, May 11, 2010 at 6:18 AM, Konrad Hinsen
>
> <[email protected]> wrote:
> >> Right now I can imagine that implementation would look like this. Each
> >> function has it own raw input form (string which is parsed by clj
> >> reader). On serialization, that raw form would be serialized and
> >> received on the other unit. With first call, such deserialized
> >> function would check if it is compiled, if not then it compiles its
> >> raw form then executes it.
>
> > That's not sufficient because you have to serialize closures, not plain
> > functions. You need more than just the source code.
>
> Actually in Clojure 1.2 the closure's lexical environment is exposed
> to macros, so this is doable. The serializable-fn tool that Kevin
> linked to demonstraes a primitive form of this, though I haven't tried
> closing over too many different types yet.
>
> (defn- save-env [env form]
> (if env
> `(let ~(vec (apply concat (for [[name local] env]
> [name (.eval (.init local))])))
> (~...@form))
> form))
>
> (defmacro fn [& sigs]
> `(with-meta (clojure.core/fn ~...@sigs)
> {:type ::serializable-fn
> ::source (quote ~(save-env &env &form))}))
>
> The problem is that the .eval method isn't supported on all expression
> types; it needs a more generalized way of getting the value of any
> compiler expression. I haven't had a chance to really dig into the
> compiler to see if there's a single way to do that, but I wouldn't be
> surprised if there were a simpler solution.
>
> -Phil
>
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