Enhancing Feature Interfaces for Suppor8ng So9ware Product Line Maintenance

Transcription

1 Enhancing Feature Interfaces for Suppor8ng So9ware Product Line Maintenance Bruno B. P. Cafeo LES DI PUC- Rio - Brazil OPUS Group

2 Mo:va:on So9ware Product Line (SPL) Feature Model Page - 2

3 Mo:va:on Boundaries of features and modules of a programming language Legend: PE Program Element PE1 PE6 PE4 PE2 PE3 PE5 PE7 PE8 Feature Model Source code Page - 3

4 Mo:va:on Feature Dependencies in the source code of a SPL Legend: PE Program Element PE1 PE6 PE4 PE2 PE3 PE5 PE7 PE8 Feature Model Source code Page - 4

5 Mo:va:on Feature Dependencies in the source code of a SPL Legend: PE Program Element Feature under maintenance PE1 PE6 PE4 PE2 PE3 PE5 PE7 PE8 Feature Model Source code Page - 5

6 Mo:va:on Feature Dependencies in the source code of a SPL Legend: PE Program Element Maintenance problems related to the presence of a feature dependency Feature under maintenance PE1 PE6 PE4 PE2 PE3 PE5 PE7 PE8 Feature Model Source code Page - 6

7 Two points to explore! Iden:fica:on and understanding of feature dependency proper8es and their impact on SPL maintenance! Feature modularity improvement Page - 7

8 Two points to explore! Iden:fica:on and understanding of feature dependency proper8es and their impact on SPL maintenance! Feature modularity improvement Page - 8

9 Feature Dependency Proper:es! There is no conceptual framework that characterizes feature dependency proper:es in the source code! Revealing proper:es that may exert an impact on SPL maintenance would be interes:ng Page - 9

10 Feature Dependency Proper:es Results! Iden:fica:on of proper:es and defini:on of metrics based on these proper:es! Correla:on of these metrics with SPL maintenance problems! Comparison of our metrics with conven:onal metrics Page - 10

11 Two points to explore! Iden:fica:on and understanding of feature dependency proper8es and their impact on SPL maintenance! Feature modularity improvement Page - 11

12 Feature Interface Looking at the source code level! As in a conven:onal stand- alone soxware (i.e. non- SPLs), interfaces should help the understanding of the communica8on between features in SPLs! Program elements configuring dependencies are part of an implicit feature interface Page - 12

13 Challenge Complex feature interfaces REGULAR_ACCOUNT account_number type sort_code balance paid_in[] paid_out[] getendofmonthbalance() getbalance() makeapayment() getfullstatement() viewaccountdetailts() gettaxes()! Feature interfaces may become large! Several elements are member of an implicit interface! Implicit feature interfaces are not cohesive! Groups of elements act together for the purpose of a dependency Page - 13

14 Towards a Solu:on! The proposed solu:on relies on the idea of Interface Segrega,on Principle (ISP) that states that clients should not be forced to depend upon interfaces that they do not use! We observe the idea of ISP from the point of view of SPL maintenance and we argue that Developers should not be forced to understand parts of an interface that are not useful to their tasks Page - 14

15 Towards a Solu:on (simple example) Iden8fying feature interface elements Legend: PE Program Element Feature Interface att1 att2 att3 att4 att5 att6 att7 method1 method2 method3 method4 method5 {method4, method5, att,6, att7} PE2 PE1 {att3, att4, att5, method3} PE7 {att1, att2, method1, method2} PE3 PE6 PE4 PE8 PE5 Feature blue Source code Page - 15

16 Towards a Solu:on (simple example) Understanding the feature interface Important part of the code Legend: PE Program Element Feature Interface Relevant elements of the collaboration PE1 {att1, att2, method1, method2} PE6 {att3, att4, att5, method3} PE4 PE2 PE3 aj6 aj7 method4 method5 {method4, method5, att,6, att7} PE7 PE8 PE5 Feature blue Source code Page - 16

17 Feature Interface Evalua8on! Conduct empirical studies to compare! The reduc:on of maintenance side effects! The SPL maintenance effort Page - 17

18 Thanks! Page - 18

19 Enhancing Feature Interfaces for Suppor8ng So9ware Product Line Maintenance Bruno B. P. Cafeo LES DI PUC- Rio - Brazil OPUS Group