Pharo4: Plans and Dreams
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Pharo4: Plans and Dreams. Talk from Fosdem 2014 On Youtube: http://www.youtube.com/watch?v=mUV9E03u52g More about Pharo at: http://pharo.org
Pharo4: Plans and Dreams
- 1. Pharo4 Plans and Dreams Marcus Denker http://rmod.lille.inria.fr
- 2. A bit early… • We are hard working to get Pharo3 out • Not much yet happened with planning Pharo4
- 3. 1 Year
- 4. 9 Months March 2014-December 2014 +Time for Bug fixing
- 5. This is not a lot!
- 6. So not too many dreams…
- 7. It needs to be doable
- 8. Ideas • Slots • Reflectivity • One-File Pharo • Tools • GIT • Athens • Bootstrap • Sista
- 9. Bootstrap • Create an image from a git repository • Control what the image contains • Easier to make changes • Enforces Modularity
- 10. Boostrap • Working for Pharo3 as a prototype ! • Can we even use this for Pharo4 on the build server?
- 11. One File Pharo • .sources, .changes. .image ! • It is time to simplify that!
- 12. Epicea • Replace .changes • High level model: • aggregate changes (refactoring) • serialized to disk independent of source model
- 14. Step2: Sources • It is 2014: Memory is cheap. • Complexity is expensive • Why not just put the sources in the image? • Just current version (compressed, of course) • Code history is in Monticello (or Git)
- 15. Slots • First class Instance Variables • Already in Pharo3, but compatible (ivar Slot) • For Pharo4: Provide different Slot kinds
- 16. Property Slots Object subclass: #PropertyObject layout: PointerLayout slots: { field => Slot property1 => PropertySlot. property2 => PropertySlot. ... propertyN => PropertySlot. }
- 17. Others • BitSlot • BooleanSlot • Alias • Relationships (e.g. one-one, one-many) • …. Your Domain level Slot!
- 18. More in Paper from OOPSLA
- 19. Reflectivity • Partial Behavioral Reflection • Associate MetaObject with structural object • e.g. Slots • AST nodes
- 20. Method Can we modify the behaviour of code? Meta Link > Annotate the AST with meta-links
- 21. Why? • Change behaviour for selected AST Nodes • “All assignments” • “this message send” But without changing the program code!
- 22. © Marcus Denker Behavioral Reflection source code (AST) meta-object activation condition links
- 23. Uses… • Debugger • BreakPoints, WatchPoints • Profilers • Coverage Analysis • AOP
- 24. … And Beyond • Every year one Release • Research happens in Parallel • Lots of Interesting Stuff • Sadly another talk
- 25. Questions ?