Actually, Clojure interop with Java is very good, so a Clojure function could be passed a Java object:
(defn frobnicate-the-request [^Request request] (.setAttribute request "xyzzyx" (compute-the-magic-name))) The ^Request part is a type hint, it allows the Clojure compiler to generate proper bytecode to access the methods of the request without using reflection. You quickly get used to the leading dot (which itself is sugar syntax over the more primitive interop special form). Now, in terms of Clojure interop ... the library I put together ago on a whim was about efficiently exposing Clojure functions bundled together as an arbitrary Java interface. If you pass the Registry to a Clojure function, it will be quite capable of pulling out whatever it needs. A lot of the capabilities of Clojure are very familiar to Tapestry users: thread bound values (inside Clojure vars) for example. My primary thought about integrating Clojure would be to allow a Tapestry app to jump into Clojure to work with the Datomic APIs natively, rather than the Java API to Datomic, which is decidedly second class. On Tue, Dec 16, 2014 at 5:24 AM, Thiago H de Paula Figueiredo < thiag...@gmail.com> wrote: > > On Mon, 15 Dec 2014 18:29:22 -0200, Ilya Obshadko <ilya.obsha...@gmail.com> > wrote: > > > How are Java objects usually passed to Clojure code? The recommended way? >>> >> >> Java objects are passed to Clojure functions in exactly the same way they >> are passed to Java method (because internally Clojure function is just an >> implementation of IFn interface, and function call is invoke(...) on its >> instance). >> > > Now I was the one who hasn't made a clear question. :) I'm not asking > about how Clojure passes function arguments. I meant when you call Clojure > code from Java code, how do you pass a Java object so it can be used inside > Clojure code? > > But I don't want to pass services to Clojure functions, I'd like to >> inject them into Clojure namespace when clojure.core/require is executed. >> > > Got it. I have no idea how to do that given my almost no knowledge of > Clojure. But I guess there's some way of doing that. > > > -- > Thiago H. de Paula Figueiredo > Tapestry, Java and Hibernate consultant and developer > http://machina.com.br > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > For additional commands, e-mail: users-h...@tapestry.apache.org > > -- Howard M. Lewis Ship Creator of Apache Tapestry The source for Tapestry training, mentoring and support. Contact me to learn how I can get you up and productive in Tapestry fast! (971) 678-5210 http://howardlewisship.com @hlship
