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Groups > comp.lang.java.programmer > #33503

methodhandles lookup

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Hello,

I'm trying to create a flexible (dynamic) binding for method calls and I have got a problem with overloaded method binding.
In detail: I have created an own programming language which should call a java method. In my own language I have got grammar constructs like "foo/bar( "myobject" );". Internal I have got a Map<String, Object> which maps the string parameter to an object which will be invoked. foo/bar points to the method, in this case foo is the classname and bar the method name. So in this example I need a binding to the method "public void bar();".
My language should also use calls like "foo/bar( "myobject", 1 );". In this case the Java method "void bar( int x );" should be called.

The basic invoking call works well, but I overloaded method creates a problem. If I have got the class

class foo
{
     public void bar()
     {
          System.out.println("test");
     }
}

I do the following:

final Multimap<String, MethodHandle> y = HashMultimap.create();
for ( final Method x : foo.class.getDeclaredMethods() )
    y.put( x.getSimpleName(), MethodHandles.lookup().unreflect(x) );

This multimap is put to the parser / lexer of my language to resolve method names but on calling / invoking I get the problem, that I need the correct methodhandle within the multimap depend on the signature. 

The problem is a class like
class foo
{
     public void bar()
     {
          System.out.println("test");
     }

     public void bar( int x )
     {
          System.out.println("test " + x);
     }
}

So my question is, how can I create a dynamic binding on method handles depend on the signature?
And can I cache the method handles / is it a good choice of caching all handles? In my case I know during runtime the concrete signature of the method, "foo/bar" is executed and on this time I know all arguments of the method, so I can create at this point the binding. How can I do this in a fast way?

Thanks

Phil

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methodhandles lookup Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2016-01-22 00:19 -0800
  Re: methodhandles lookup Jeff Higgins <jeff@invalid.invalid> - 2016-01-22 08:57 +0000
  Re: methodhandles lookup Jeff Higgins <jeff@invalid.invalid> - 2016-01-22 11:01 +0000
    Re: methodhandles lookup Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2016-01-22 03:13 -0800
      Re: methodhandles lookup Jeff Higgins <jeff@invalid.invalid> - 2016-01-22 11:43 +0000
        Re: methodhandles lookup Jeff Higgins <jeff@invalid.invalid> - 2016-01-22 12:03 +0000
          Re: methodhandles lookup Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2016-01-24 01:59 -0800
      Re: methodhandles lookup Jeff Higgins <jeff@invalid.invalid> - 2016-01-22 12:16 +0000
        Re: methodhandles lookup Jan Burse <janburse@fastmail.fm> - 2016-01-22 17:12 +0100
  Re: methodhandles lookup Martin Gregorie <martin@address-in-sig.invalid> - 2016-01-22 11:27 +0000
    Re: methodhandles lookup Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2016-01-24 01:56 -0800
  Re: methodhandles lookup Jan Burse <janburse@fastmail.fm> - 2016-01-22 16:49 +0100

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