2009/10/15 Manuel Woelker <manuel.woel...@gmail.com>
>
> On Thu, Oct 15, 2009 at 5:48 AM, jng27 <jgran...@gmail.com> wrote:
> >
> > The following seems like it could be a common scenario when attempting
> > to re-write parts of an existing Java application in Clojure.
> >
> > Let's say there exists Clojure code and Java code in the same
> > 'project'.
> > The Clojure code depends on the Java code in one direction and then
> > the same is true in the opposite direction.
> > Given that compiling Java and Clojure require separate and different
> > compilation steps, how would circular dependencies be resolved ?
> > e.g. A class is defined in the Clojure code that references Java
> > classes(yet to be compiled) and the same is true for the Java code
> > referencing classes defined in Clojure(yet to be compiled). It doesn't
> > seem like compiling one before the other would solve this issue.
> >
> One possible solution that could be feasible is a two pass compilation
> for clojure. The first compilation pass would basically just generate
> the skeletons for the classes, i.e. just the method "heads" with each
> method body being ignored and replaced with 'throw new
> IllegalStateExccpetion("You are using first pass compilation
> results")' or something along those lines. After this compilation pass
> the Java classes can be compiled just fine, since all method calls can
> be resolved. Finally the second pass of the clojure compilation fills
> in the real method bodies, now that Java classes have been generated.
> This should in theory work for most scenarios.
>
But there is still the case of true circular dependencies between
definitions, even of interfaces (let's not talk about implementation code) :
A java interface JavaInterface with a method of signature "ClojureInterface
foo()"
A clojure generated interface (via gen-interface) ClojureInterface with a
method of signature "JavaInterface bar()"
Compiling JavaInterface requires ClojureInterface
Compiling ClojureInterface requires JavaInterface
chess mat if not done by the same ubiquitous compiler :-(
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