How can I pass a javaScript function to a Java Method to act as a callback

[Dan Howard]

Hi everyone,

Basically I'm trying to pass a javaScript function to a Java method to 
act as a callback to the script.

I can do it - sort of - but the object I receive is a 
sun.org.mozilla.javascript.internal.InterpretedFunction and I don't see 
a way to invoke it.

Any ideas? BTW currently I'm using Rhino inside Java 6.

Here's what I have so far:

var someNumber = 0;

function start() {
   // log is just an log4j instance added to the Bindings
   log.info("started....");
   someNumber = 20;

    // Test is a unit test object with this method on it (taking Object 
as a param).
    test.callFromRhino(junk);
}

function junk() {
    log.info("called back " + someNumber);
}


** JAVA SIDE:

import game.util.FileUtil;
import junit.framework.TestCase;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import javax.script.*;
import java.net.URL;

public class TestRhino extends TestCase {

    private static final Logger log = 
LogManager.getLogger(TestRhino.class);

    private ScriptEngineManager mgr = new ScriptEngineManager();
    private ScriptEngine engine = mgr.getEngineByName("JavaScript");

    protected void setUp() throws Exception {
        super.setUp();
    }

    protected void tearDown() throws Exception {
        super.tearDown();
    }

    public void testCallback() {
        try {

            URL url = getClass().getResource("/callback.js");
            String contents = FileUtil.getFileContents(url.getFile());
            Compilable compilingEngine = (Compilable) engine;
            CompiledScript script = compilingEngine.compile(contents);

            Bindings bindings = 
engine.getBindings(ScriptContext.ENGINE_SCOPE);
            bindings.put("log", log);
            bindings.put("test", this);
            script.eval(bindings);

            Invocable invocable = (Invocable) script.getEngine();
            invocable.invokeFunction("start");

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            fail(e.getMessage());
        }

    }

    public void callFromRhino(Object callback) {
        // how could I call back to this function?
        log.info(callback.getClass().getName());
    }
}
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