Re: How to pass a Java callable to C#?

Jeroen,

Thanks for the feedback, but I think I didn't explain very well my problem.
The Widget library is written in C# and is being used by the Java
interpreter (running on the CLR). I wish to be able to register the
callback in Java.

This works in IronPython, because IronPython knows how to map Python
functions onto Func<object,object>:

"""
from Widgets import Widget
def f(obj):
    print("Click!")
w = Widget()
w.on_click(f)
"""

I have the same working in a Scheme running on the CLR, because I can
define and wrap around callback1 in C#  to map it to Func<object,object>:

"""
(using "Widgets")
(define f (lambda (obj) (printf "~a\n" obj))
(define w (Widget))
(w.on_click (callback1 f))
"""

So, I'm trying to figure out how to do the same thing in Java: map
something in Java onto Func<object,object>, so something like this will
work in DynamicJava:

"""
import static cli.Widgets.*;

public int f(Object widget) {
}

Widget w = new Widget();
w.on_click(f);
"""

Does ikvm have something built-in to help pass a Java function to C#? Or do
you have a general strategy for doing this?

Thanks for any further hints,

-Doug


On Sun, Feb 16, 2014 at 4:21 AM, Jeroen Frijters <[email protected]> wrote:

> Hi Doug,
>
> I'm probably misunderstanding the question, but in Java you'd use
> interfaces for this. See
> http://docs.oracle.com/javase/7/docs/api/java/awt/Button.html#addActionListener(java.awt.event.ActionListener)for example.
>
> Regards,
> Jeroen
>
> > -----Original Message-----
> > From: Doug Blank [mailto:[email protected]]
> > Sent: Sunday, February 16, 2014 0:57
> > To: [email protected]
> > Subject: [Ikvm-developers] How to pass a Java callable to C#?
> >
> > I am doing some refining on the DynamicJava interpreter written in Java
> > that is running under Mono [1]. (C# libraries are made available to the
> > interpreted Java through ikvmstub, and the Java interpreter is running
> > by being compiled with ikvmc). Everything is working very well, but one
> > thing I would like to do is be able to pass a Java callback to a C#
> > function.
> >
> >
> > The C# code looks like this (although I could change it in any manner):
> >
> >
> > public class Widget {
> > public void on_click(System.Func<object,object> function) {
> >         }
> > }
> >
> > In general, how would a Java program register a callback to the C#? I
> > can write an interface on either the Java side, or the C# side.
> >
> > Thanks for any suggestions,
> >
> > -Doug
> >
> > [1] -
> > https://bitbucket.org/ipre/calico/src/master/languages/Java/dynamicjava/
>

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