June 3rd, 2013 Quinten David Soetens Javier Pérez Serge Demeyer Change-Based Refactoring Mining 

Echelon Formation Wedge Formation 

Mining Refactorings Move Method Rename Method Extract M ethod Extract Superclass Inline Method Hide Delegate Inline Temp M ove Field Pull Up Method Rem ove Param eter Identify which refactorings were performed during evolution of a software system. 

State of the Art All these are Snapshot Based 

Snapshots are Coarse Grained A F J 

Fine Grained Code Changes A B D E G H I J L M N P Q R S 

SVNKit Change Distiller Model Logger Distiller ChEOPSJ ChangeRecorders Applications TestSelection ChEOPSJ: Change-Based Test Optimization
 Quinten David Soetens and Serge Demeyer
 In "Proceedings of 16th European Conference on Software Maintenance and Reengineering, CSMR 2012
 Change-Based Test Selection in the Presence of Developer Tests
 Quinten David Soetens, Serge Demeyer and Andy Zaidman
 In "Proceedings of 17th European Conference on Software Maintenance and Reengineering, CSMR 2013
 

First Class Change Objects Changes act on Source Code (FAMIX) Entities (e.g. AddClassChange, AddMethodChange, etc.) 

First Class Change Objects Changes have Structural Dependencies (e.g. AddMethod ---> AddClass--->AddPackage etc.) 

Change Graphs Move Method foo Rename foo to boo 

Refactoring Patterns FamixClass FamixMethod FamixMethod string name name RenameMethod Refactoring string ≠ FamixClass FamixMethod FamixMethod string name name string ≠ From To FamixClass FamixClass ≠ FamixMethod FamixMethod string name name FamixClass FamixClass ≠ FamixMethod FamixMethod string name name MoveMethod Refactoring From To 

Results 

Future Directions • Implement and evaluate this approach • Use Groove as Graph Transformation Engine • Compare with RefFinder • Extend with more Refactoring Patterns • Industrial Case Study 

Conclusions