DRb, Ruby & JRuby - Questions & Issues / dynamic method call

Ruby
1

I overview after these examples to ease the pain :slight_smile:

@@connection = Java::Connect(usr,pass)

This works:

@@connection.getForeignListing.getListing(1441).getStreet #=> 123
Candy Ln.

This works:

@@connection.send(“getForeignListing”).send(“getListing”,
1441).send(“getStreet”) #=> 123 Candy Ln.

This works:

def test(a,b,c,d)
return @@connection.send(a).send(b,c).send(d)
end
test(“getForeignListing”, “getListing”, 1441, “getStreet”)

Does not work:

def test(a,b,c)
return @@connection.send(a).send(b).send©
end
test(“getForeignListing”, [“getListing”, 1441], “getStreet”)

test.rb:4:in `send’: [“getListing”, 5053500] is not a symbol (TypeError)

In summary, I’ve managed to hook the working versions above within a
class for a DRb server.

The ultimate goal, is to create a generic DRb method that client input
into into method-syntax that the connection can interpret.

For example, as mentioned above, this works:
@@connection.getForeignListing.getListing(1441).getStreet

I’d like to create a method in the DRb server that could accept
something like:
java_call = “getForeignListing.getListing(1441).getStreet”
@@connection.send(java_call)

This would allow me to dynamically manage the java methods via DRb.

Thanks so much for your input.

2

On Dec 18, 2006, at 19:43, x1 wrote:

Does not work:

def test(a,b,c)
return @@connection.send(a).send(b).send(c)
end
test(“getForeignListing”, [“getListing”, 1441], “getStreet”)

test.rb:4:in `send’: [“getListing”, 5053500] is not a symbol
(TypeError)

This won’t ever work.

$ ri Object#send
------------------------------------------------------------ Object#send
obj.send(symbol [, args
]) => obj
obj.send(symbol [, args
]) => obj

  Invokes the method identified by symbol, passing it any arguments
  specified. You can use __send__ if the name send clashes with an
  existing method in obj.

You want:

send(*[‘getListing’, 5053500])

–
Eric H. - [email protected] - http://blog.segment7.net

I LIT YOUR GEM ON FIRE!