ESUG 2011, Edinburgh

1. Not-So-Foreign
Functions
Calling Ruby from
Smalltalk
Martin McClure
2011 ESUG

2. Why Foreign
Functions?

3. Shared library call

4. Distributed object system
Shared library call

5. Distributed object system
Is there an
in-between way?
Shared library call

6. Distributed object system
Multi-language VM
Shared library call

7. Multi-language VM
MagLev: Ruby and Smalltalk
in the same VM

8. How does that work?

9. How does that work?
An object...

10. How does that work?
An object...
...is an object...

11. How does that work?
An object...
...is an object...
...is an object...

12. How does that work?
A class...

13. How does that work?
A class...
...is a class...

14. How does that work?
A class...
...is a class...
...is a class...

15. How does that work?
BUT...

16. How does that work?
A message...

17. How does that work?
A message...
...is Smalltalk...

18. How does that work?
A message...
...is Smalltalk...
...or is Ruby.

19. How does that work?
A class...

20. How does that work?
A class...
...may define different
Ruby and Smalltalk
methods...

21. How does that work?
A class...

22. How does that work?
A class...
...may have different
Ruby and Smalltalk
names...

23. How does that work?
A class...

24. How does that work?
A class...
...may have different
Ruby and Smalltalk
superclasses.

25. Selector Supplements
● Environment ID
● Number/type of sent
arguments

26. Selector Supplements
● Default send environment =
compile environment
● Must override this default

27. Onward
to the
Demo

28. Thanks to:
Peter McLain
Tim Felgentreff

29. rubygems.org
>25000 gems

30. maglev-gem install mailfactory

32. What's Next?
● Name “RubyService”?
● You tell us...

33. ?
Martin McClure
2011 ESUG