Presentation of IWST16, Prag Video: https://www.youtube.com/watch?v=A1LvlT0_x3I

1. Lub
A language for Dynamic Context
Oriented Programming
Steven Costiou
Mickaël Kerboeuf, Glenn Cavarlé, Alain Plantec
UMR CNRS 6285, Lab-STICC/MOCS
Université de Bretagne Occidentale

2. Drone 1 + GPS
Drone 2 + GPS
Target

3. Drone 2 NO GPS
GPS loss
Drone 1 + GPS

4. Unanticipated

5. Unanticipated
=
Not foreseen at design time

6. Unanticipated
=
Not foreseen at design time
=
The behavior we need was
not expected

7. ▪ Schéma 4 : Adaptation proposition
GPS sharing
Drone 1 + GPS
Drone 2 NO GPS

8. Unanticipated behavior
adaptation at runtime

9. Minimal anticipation

10. Minimal anticipation
=
Anticipate the need to face
unanticipated adaptation

11. Minimal anticipation
=
Anticipate the need to face
unanticipated adaptation
=
Build Support
(frameworks)

12. Dynamic context oriented
programming (COP)

13. What we adapt:
Objects

14. ● Instance based adaptation
● Adapted object preserve
their identity

15. How do we adapt ?

16. ● Free adaptation strategy
● Easy and controlled
behavior selection

17. LUB
An extension of Pharo

18. Behavior adaptation through
dynamic lookup control

19. #pinPoint

20. Lookup base
#pinPoint

21. Lookup starts in the
object’s lookup base
Lookup
#pinPoint

23. New lookup base

24. lub := LookupBase
named: ‘PeerTrackerLookupBase’
targetClass: PeerPositionTracker

26. bind

27. positionTracker lookupBase: lub.
positionTracker pinPoint
lub := LookupBase
named: ‘PeerTrackerLookupBase’
targetClass: PeerPositionTracker

28. #pinPoint

29. #pinPoint

30. does-not-understand
#pinPoint

31. does-not-understand
#pinPoint

32. Selection of the behavior to
adapt ?

33. lub := LookupBase
named: ‘PeerTrackerLookupBase’
targetClass: PeerPositionTracker
with: #(#pinPoint).
positionTracker lookupBase: lub.
positionTracker pinPoint.
positionTracker position.

35. #pinPoint

36. #position

37. ● Instance based
adaptation
● Adapted object
preserve their identity
Binding an object to a meta
object that controls the lookup
● Free adaptation
strategy
● Easy and controlled
behavior selection

38. Issues ?

39. States consistency with an
adaptation ?

40. pinpoint
^peerTracker pinPoint

41. Validation and consistency of
the adapted behavior ?

42. Experiments on a physical
device ?

43. Lub
A language for Dynamic Context
Oriented Programming
Steven Costiou
Mickaël Kerboeuf, Glenn Cavarlé, Alain Plantec
UMR CNRS 6285, Lab-STICC/MOCS
Université de Bretagne Occidentale