Lub: a DSL for Dynamic Context Oriented Programming

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Lub is a language for dynamic context-oriented programming that allows objects to be adapted at runtime. It extends the Pharo programming language. Lub allows objects' behaviors to be freely adapted through dynamic lookup control by binding objects to meta objects that control their lookup strategy. This enables easy and controlled selection of behaviors to adapt. Issues that need further exploration include maintaining state consistency during adaptation and validating the consistency of adapted behaviors. Experiments on physical devices are also needed.

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

Unanticipated
=
Not foreseen at design time

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

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

Unanticipated behavior
adaptation at runtime

Minimal anticipation
=
Anticipate the need to face
unanticipated adaptation

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

Dynamic context oriented
programming (COP)

● Instance based adaptation
● Adapted object preserve
their identity

● Free adaptation strategy
● Easy and controlled
behavior selection

Behavior adaptation through
dynamic lookup control

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

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

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

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

● 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

Validation and consistency of
the adapted behavior ?

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Lub: a DSL for Dynamic Context Oriented Programming

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

22.

23. New lookup base

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

25.

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.

34.

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

Lub: a DSL for Dynamic Context Oriented Programming

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