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Trygve Reenskaug University of Oslo

Explore the BabyUML methodology for program design emphasizing communication, data structures, and algorithms. Learn project planning, activity networks, and object space partitioning.Learn about BabyComponents, interfaces, frontloading, collaboration, and the BabyUML laboratory.

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Trygve Reenskaug University of Oslo

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  1. The BabyUML Discipline of Programmingwhere A Program = Communication + Data Structures + Algorithms Trygve Reenskaug University of Oslo ECMDA 2005 BabyUML-ECMDA

  2. Project Planning withActivity Networks BabyUML-ECMDA

  3. Project resources User tools Project activities actA actC actB actD Class Class Class The Problem Undisciplined communication →Spaghetti Class, superclasses, methods →Noodles BabyUML-ECMDA

  4. resources «Component» gui «Component» activityNetwork «Component» The BabyComponent BabyUML-ECMDA

  5. BabyUML LaboratoryOverview Partition Object Space intoBabyComponents Encapsulates member objects • Data Structures • declare Member Objects • defines Universe of Discourse • Communication • BabyCollaboration • operations as Interacting Roles • Algorithms • classes, superclasses, methods BabyUML-ECMDA

  6. Conventional Activity class (pseudocode fragment) Define class Activity subclass of Object with attributes name, duration, earlyStart,Activity [ ] preds, succs method addSuccessor (anActivity) add anActivity to succs. method addPredecessor (anActivity) add anActivity to preds. BabyUML-ECMDA

  7. Code that Declaresthe Universe of Discourse 3-schemaarchitecture External Conceptual Internal BabyUML-ECMDA

  8. CodePreserves Referential Integrity Define class Activity subclass of Object with attributes name, duration, earlyStart method frontloadFrom (firstWeek) earlyStart := firstWeek.babyBase predecessorsOf (self) do: [:predecessor | earlyStart :=max (earlyStart, predecessor earlyFinish] BabyUML-ECMDA

  9. BabyComponentProvided Interface newActivity (name)addDependent (from, to)frontloadFrom (firstWeek)activityNames xmlActivity (activityName) «provided interface» «Component»activityNetwork BabyUML-ECMDA

  10. newActivity addDependent xmlActivity activityNames A Projection for eachProvided Operation activityNetwork«component» frontloadFrom (firstWeek) BabyUML-ECMDA

  11. Frontloading InteractionCommunication Code BabyUML-ECMDA

  12. activitiesCollab bindRole resetter toMembers babyBase.activities. Query Fragment: activitiesCollabQuery: Data Structure Communication activitiesCollab «Collaboration» resetter * maestro resetEarlyStart collab - activitiesCollab Data Structure Conceptual Schema BabyUML-ECMDA

  13. Fragment: activitiesCollabAlgorithm: resetEarlyStart External Schema Communication activitiesCollab «Collaboration» resetter * maestro resetEarlyStart Communication Data Structure collab - activitiesCollab Algorithm resetEarlyStart earlyStart := nil BabyUML-ECMDA

  14. Frontloading InteractionSequence Diagram BabyUML-ECMDA

  15. Fragment: frontCollabQuery: Data Structure frontCollab «Collaboration» 1 frontloader maestro frontload From ( firstWeek ) 1 Communication * predecessor earlyStart Data Structure Query collab - frontCollab -1 frontCollab bindRole frontloader toMember: find act from activities such that: (act planned not and all act.predecessors.planned) bindRole predecessor toMembers: babyBase predecessorsOf (frontloader). BabyUML-ECMDA

  16. Fragment: frontCollabAlgorithm: frontLoadFrom ( ) frontCollab «Collaboration» 1 frontloader maestro frontload From ( firstWeek ) 1 Communication * predecessor earlyStart Data Structure collab - frontCollab -1 Algorithm frontloadFrom (firstWeek) earlyStart := firstWeek . forAll predecessor do: [: pred | earlyStart := max (earlyStart, pred earlyFinish) BabyUML-ECMDA

  17. Class Class Class BabyUML Summary: 1 of 4 Stored Program Object Computer BabyUML Virtual Machine (Smalltalk/Squeak VM) BabyUML-ECMDA

  18. BabyUML Summary: 2 of 4BabyComponents BabyUML Virtual Machine (Smalltalk/Squeak VM) BabyUML-ECMDA

  19. activityNetwork «Component» Member Objects Port Maestro BabyBase BabyUML Summary: 3 of 4Anatomy of a Component BabyUML Virtual Machine (Smalltalk/Squeak VM) BabyUML-ECMDA

  20. activityNetwork «Component» Member Objects Port Maestro BabyBase BabyUML Summary: 4 of 4A Coherent Discipline Algorithms Data Structure Communication Component identity BabyUML-ECMDA

  21. Finally, A Challenge Modeling languagesremind uswhat should be included in our Programming Languages More info at heim.ifi.uio.no/~trygver BabyUML-ECMDA

  22. http://www.ifi.uio.no/~trygver mailto: trygver ‘at’ ifi.uio.no Trygve Reenskaug: Towards a New Discipline of Programming with the BabyUML Language Laboratory.http://heim.ifi.uio.no/~trygver/2005/babyuml/BabyUML.book.pdf Trygve Reenskaug: Empowering People with BabyUML: A sixth GenerationProgramming Language. Opening talk, ECOOP 2004, Oslo.http://heim.ifi.uio.no/~trygver/2004/ECOOP-04/EcoopHandout.pdf Unified Modeling Language: Superstructure. Version 2.0.Object Management Group. Document ptc/04-10-02 or later http://www.omg.org Model Driven Architecture See: http://www.omg.org/mda/ Cattell, Barry: The Object Data Standard: ODMG 3.0. Academic Press,London, 2000. ISBN 1-55860-647-4 Erik Arisholm and Dag Sjøberg, A Controlled Experiment with Professionals to Evaluate the Effect of a Delegated versus Centralized Control Style on the Maintainability of Object-Oriented Software, Simula Research Laboratory Technical Report 2003-6http://www.simula.no/publication_one.php?publication_id=601 Richard Pawson and Robert Matthews: Naked Objects. Wiley 2002, ISBN: 0-470-84420-5 More details …. BabyUML-ECMDA

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