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Code level change propagation in virtual platform

H
HaiderAli650468

The document discusses code-level change propagation in a virtual platform for managing software variants. It describes two operators - SynchronizeAsset and IntegrateAsset - that were developed to address issues with existing non-code based propagation. SynchronizeAsset allows two-way synchronization of code changes between assets while wrapping changes in presence conditions and tracking variation points. IntegrateAsset allows one-way propagation of changes from a source to target asset, also wrapping changes in presence conditions. The effectiveness of these operators is evaluated in a developer study where tasks are timed both with and without the operators.

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Code-level Change Propagation in Virtual Platform Haider Ali : gushaial@student.gu.se Gagandeep Singh: gusniga@student.gu.se Pre-Developer Study Session
Variant-rich Software Systems ● Software Systems developed to reach different customers’ needs ● Different Variants of a same Software System ● Grammarly Example Standard Variant Premium Variant
Variants Management Techniques ● Clone&own ○ Easy to use and adopt to ○ No feature location or clone detection Bug in Spelling ● SPL (Software Product Line) ○ Reusable assets (Features) + Configurator ○ Low Maintenance ○ Expensive
Virtual Platform as a Variants Management Framework ● Conceptual Structures ○ Asset (Repository, Folders, Files, Classes, Methods) ○ Asset Tree ○ Traceability Databases ○ Features ○ Feature Model ● Clone Management with Versions ● Feature to asset mappings ● Facilitates migration from Clone&own to SPL ● Propagation of changes
Issues with change propagation in the Virtual Platform? ● Propagation is done by content replacement ● Support for non code based assets and non code related operations ○ Renaming files, Adding new files etc. ● No code-level change propagation
Our Artefact : Code-level change propagation operators ● Applies to only MethodType Assets ● Cater two different scenarios along with Feature Annotations ○ SynchronizeAsset Operator ■ Two-way Synchronization of changes between two assets of same type ■ Wraps the changes with the presence condition ■ Keeps track of the Variations Points ○ IntegrateAsset Operator ■ One-way Propagation of code-level changes ■ Deletion of the source asset from source Variant after propagation ■ Wraps the changes with the presence condition
public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); } Synchronize Operator (2-way propagation) Target Source
Synchronize Operator (2-way propagation) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } } Target Source
Synchronize Operator (2-way propagation) public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); //&begin[Marked as Variation Point due to deletion in target] double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); //&end[Marked as Variation Point due to deletion in target] //&begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&begin[Hierarchy Presence Condition] this.updateDeltas(angle, speed); //&end[Hierarchy Presence Condition] } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } } Target Source
Synchronize Operator (2-way propagation) public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); //&begin[Marked as Variation Point due to deletion in target] double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); //&end[Marked as Variation Point due to deletion in target] //&begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&begin[Hierarchy Presence Condition] this.updateDeltas(angle, speed); //&end[Hierarchy Presence Condition] } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } } Target Source {Split of common and uncommon code in separate blocks} }
Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
public void init() { this.setActive(true); this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } this.updateDeltas(angle, speed); } public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); &begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } &end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
public void init() { this.setActive(true); this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } this.updateDeltas(angle, speed); } public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); &begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } &end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); &begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } &end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
Developer Study ● Control Groups ○ Manual Synchronization of two assets ○ Manual Integration of an asset in an other ○ Time each synchronization and integration task and note it down ○ Save the results for each task in a file ● Treatment groups ○ Synchronization using SynchronizeAsset operator ○ Integration using IntegrateAsset operator ○ Note down the times for each task ○ Save the results for each task in a file ● Feedback and results Questionnaire
Any Questions?

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Code level change propagation in virtual platform

  • 1. Code-level Change Propagation in Virtual Platform Haider Ali : gushaial@student.gu.se Gagandeep Singh: gusniga@student.gu.se Pre-Developer Study Session
  • 2. Variant-rich Software Systems ● Software Systems developed to reach different customers’ needs ● Different Variants of a same Software System ● Grammarly Example Standard Variant Premium Variant
  • 3. Variants Management Techniques ● Clone&own ○ Easy to use and adopt to ○ No feature location or clone detection Bug in Spelling ● SPL (Software Product Line) ○ Reusable assets (Features) + Configurator ○ Low Maintenance ○ Expensive
  • 4. Virtual Platform as a Variants Management Framework ● Conceptual Structures ○ Asset (Repository, Folders, Files, Classes, Methods) ○ Asset Tree ○ Traceability Databases ○ Features ○ Feature Model ● Clone Management with Versions ● Feature to asset mappings ● Facilitates migration from Clone&own to SPL ● Propagation of changes
  • 5. Issues with change propagation in the Virtual Platform? ● Propagation is done by content replacement ● Support for non code based assets and non code related operations ○ Renaming files, Adding new files etc. ● No code-level change propagation
  • 6. Our Artefact : Code-level change propagation operators ● Applies to only MethodType Assets ● Cater two different scenarios along with Feature Annotations ○ SynchronizeAsset Operator ■ Two-way Synchronization of changes between two assets of same type ■ Wraps the changes with the presence condition ■ Keeps track of the Variations Points ○ IntegrateAsset Operator ■ One-way Propagation of code-level changes ■ Deletion of the source asset from source Variant after propagation ■ Wraps the changes with the presence condition
  • 7. public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); } Synchronize Operator (2-way propagation) Target Source
  • 8. Synchronize Operator (2-way propagation) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } } Target Source
  • 9. Synchronize Operator (2-way propagation) public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); //&begin[Marked as Variation Point due to deletion in target] double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); //&end[Marked as Variation Point due to deletion in target] //&begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&begin[Hierarchy Presence Condition] this.updateDeltas(angle, speed); //&end[Hierarchy Presence Condition] } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } } Target Source
  • 10. Synchronize Operator (2-way propagation) public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); //&begin[Marked as Variation Point due to deletion in target] double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); //&end[Marked as Variation Point due to deletion in target] //&begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } //&begin[Hierarchy Presence Condition] this.updateDeltas(angle, speed); //&end[Hierarchy Presence Condition] } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.setActive(true); this.updatePosition(); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } } Target Source {Split of common and uncommon code in separate blocks} }
  • 11. Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
  • 12. public void init() { this.setActive(true); this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } this.updateDeltas(angle, speed); } public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); &begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } &end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
  • 13. public void init() { this.setActive(true); this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } this.updateDeltas(angle, speed); } public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); &begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } &end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
  • 14. public void init() { //&begin[Hierarchy Presence Condition] this.setActive(true); //&end[Hierarchy Presence Condition] this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); &begin[Hierarchy Presence Condition] if (Math.random() < 0.5) { this.setX(AsteroidSprite.getWidth() >> 1); this.setDeltaX(-this.getDeltaX()); } &end[Hierarchy Presence Condition] this.updateDeltas(angle, speed); } Integrate Operator (Source -> Target) public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } public void init() { this.updatePosition(); double angle = Math.random() * Math.PI / 4 - Math.PI / 2; double speed = MAX_ROCK_SPEED / 2 + Math.random() * (MAX_ROCK_SPEED / 2); this.updateDeltas(angle, speed); } Source Target
  • 15. Developer Study ● Control Groups ○ Manual Synchronization of two assets ○ Manual Integration of an asset in an other ○ Time each synchronization and integration task and note it down ○ Save the results for each task in a file ● Treatment groups ○ Synchronization using SynchronizeAsset operator ○ Integration using IntegrateAsset operator ○ Note down the times for each task ○ Save the results for each task in a file ● Feedback and results Questionnaire