Product Line Architectures (PLAs) using Change-Sets and Relationships

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1 Modeling and Evolving Software Product Line Architectures (PLAs) using Change-Sets and Relationships Scott A. Hendrickson School of Information and Computer Sciences University of California, Irvine Architecture-Centric Evolution (ACE) Working Group March 2,

Modeling Product Line Variability How do we model features at the

Free Product: - Reader Audio Player Reader Key: Reader/ Writer

Mandatory Optional Mutually Exclusive Feature Model?

2 Modeling Product Line Variability How do we model features at the software architecture level? Free Product: - Reader Audio Player Reader Key: Reader/ Writer And Or Variant Purchase Reminder Decoder Encoder/ Decoder Mandatory Optional Mutually Exclusive Feature Model? Pro Trial Product - Reader - Decoder - Purchase Reminder Product - Reader / Writer - Encoder / Decoder Product Architectures 2

3 Traditional Variation Points Audio Player == reader == writer Reminder == true ( == encoder ) OR == decoder Variant Reader Reader / Writer Sound Source Player Purchase Reminder Variant Decoder Decoder/ Encoder ( == encoder OR == writer ) == decoder == encoder Guard Variables and Possible Values: = { reader writer } = { none encoder decoder } Reminder = { false true } 3

4 Selecting the Free Product Audio Player == reader == writer Reminder == true ( == encoder ) OR == decoder Variant Reader Reader / Writer Sound Source Player Purchase Reminder Variant Decoder Decoder/ Encoder ( == encoder OR == writer ) == decoder == encoder Guard Variables and Possible Values: = { reader writer } = { none encoder decoder } Reminder = { false true } 4

5 Selecting the Trial Product Audio Player == reader == writer Reminder == true ( == encoder ) OR == decoder Variant Reader Reader / Writer Sound Source Player Purchase Reminder Variant Decoder Decoder/ Encoder ( == encoder OR == writer ) == decoder == encoder Guard Variables and Possible Values: = { reader writer } = { none encoder decoder } Reminder = { false true } 5

6 Selecting the Pro Product Audio Player == reader == writer Reminder == true ( == encoder ) OR == decoder Variant Reader Reader / Writer Sound Source Player Purchase Reminder Variant Decoder Decoder/ Encoder ( == encoder OR == writer ) == decoder == encoder Guard Variables and Possible Values: = { reader writer } = { none encoder decoder } Reminder = { false true } 6

7 Difficulties with Variation Points Audio Player == reader == writer Reminder == true ( == encoder ) OR == decoder Variant Reader Reader / Writer Sound Source Player Purchase Reminder Variant Decoder Decoder/ Encoder ( == encoder OR == writer ) == decoder == encoder Selection is natural, but High degree of redundancy, scattering, tangling Concepts implicitly represented, difficult to interpret and manipulate 7

8 Key: Model Variability using Change-Sets Change-Sets Change-Set (1) Removals Encapsulate (1) R l logically-related variability Merged together to compose products (2) References (3) Additions Original Architecture ( Incorporate Changes from a change-set ) Resulting Architecture 8

9 Composing Products using Change-Sets [] Baseline [ ] Baseline Free Product Decoder Encoder Writer Record Support Purchase Reminder Pro Product Trial Product 9

10 Composing the Free Product [] Baseline Free Product Decoder Encoder Writer Record Support Purchase Reminder Pro Product Trial Product 10

11 Composing the Trial Product [] Baseline Free Product Decoder Encoder Writer Record Support Purchase Reminder Pro Product Trial Product 11

12 Composing the Pro Product [] Baseline Free Product Decoder Encoder Writer Record Support Purchase Reminder Pro Product Trial Product 12

13 Explicit Relationships between Change-Sets [] Baseline [ ] Baseline Free Product Decoder Encoder Writer Record Support Relationships Explicitly express change-set interdependencies Govern valid change-set combinations Purchase Reminder Pro Product Trial Product 13

14 Change-Set & Relationship Architecting Environment (1) Added (2) Removed (3) Modified Change Sets (4) Composed (5) Context Relationships 14

15 Conclusions and Future Work Change-sets and Relationships Applied to 5 PLAs (3 illustrative, 2 real) Reduce PLA redundancy, scattering and tangling g Directly visualizable and manipulable Generalization: Approach is applicable to other artifact types E.g., Class / Activity Diagrams and State Charts Applicable across multiple artifacts Future work: collaboration and evolution 15

16 Thank you Questions? Acknowledgements: NSF Grants CCF , CCF , CCF , IIS , & IIS The Boeing Corporation The Aerospace Corporation Graduate Assistance in Areas of National Need (GAANN) Fellowships UC, Irvine TA Fellowship 16

UC Irvine UC Irvine Previously Published Works

UC Irvine UC Irvine Previously Published Works Title Differencing and merging within an evolving product line architecture Permalink https://escholarship.org/uc/item/0k73r951 Authors Chen, Ping H Critchlow,