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Figure 11-1: Feature tree
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For more on feature trees, see K Czarnecki, S Helsen, U Eisenecker, Staged Con guration Using Feature Models, Software Product Lines: Third International Conference, Boston, MA, 2004
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Identifying Variability
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For example, as a customer, I might decide that I don t need multiple projects, but I do need multiple users, although access control is not required I ll have an audit trail, but must accept that because I haven t chosen access control I can t restrict the audit trail to managers The tree notionally includes every feature in the requirements document; some of them may turn out not to be optional after all After some discussion, CJKW decides that Multiple Projects is a non-optional feature of every installation; this saves development effort, and in practice loses little exibility customers who want single list of issues need only create one project Development tasks can be mapped to the nodes in the tree that they enable Development effort is required both for features and optional or XOR nodes One task links each issue to a milestone, but more effort is required to make that optional per installation, and yet more is needed to make it optional per project A feature tree is about requirements, rather than design; each feature describes something that can be seen by the client of the system In their rst few customer-speci c systems, CJKW s design choices evolved somewhat as the team gained experience Many of the variations are about changes in design choices rather than changes in requirements for example, using a list instead of an array at some point These changes are not included in the feature tree Choices may be marked with how often or in what context they may vary for example, Single/Multiple User select on Installation; Custom Fields select per issue type or project; Multiple Types of Issue per Project currently xed at false Each project de nes a single type of issue Feature trees are not only for features visible to end users If you are designing something like a generic wizard builder, then your clients are the developers who call your subsystem, and your features are the behavior visible to them at your API
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Feature Trees and DSLs Feature trees work well for binary or enumerated choices A feature tree can work more or less directly as a DSL clothed in a suitable syntax Many installers have feature trees that appear either in the form of expandable trees of checked options or as wizards
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11: De signing a DSL
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But some variabilities are more complex structures that cannot simply be selected or deselected Inspecting its feature tree, CJKW s developers identify that where customers opt for Sequence of states constrained to a given sequence and custom elds de nable per project, the users will need suitable notations for de ning the detail of these choices This is the origin of the two DSLs used in the project
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Developing the Domain Model
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In 2, the Issue State DSL came about by observing that statecharts seemed a good t with the problem, which was con rmed by the business analyst who was already drawing state diagrams informally when eliciting requirements from customers Once that basic connection had been observed, the DSL was re ned by sitting back and thinking about the domain model and notation as a whole, and by making changes incrementally to the de nition (for example, adding properties to domain classes) as dictated by the needs of the code generators However, it s not always that easy In this section, we describe a more systematic technique for creating the domain model aspect of a DSL This technique tends to be useful to get you through cases where it s proving dif cult to work out exactly what domain classes, relationships, and domain properties are required The technique is adapted from a technique proposed in the Catalysis2 approach to object-oriented analysis and design
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Sketch Domain Snapshots The requirements scenarios describe the domain in words To help clarify them, it is a very useful whiteboard technique to draw snapshots A snapshot is an informal drawing showing a collection of elements and links at a particular moment in time Only some elements and links will be instances of domain classes and relationships in the domain model of a DSL; the domain model can be inferred from them Others represent instances in a running system generated from models expressed in the DSL; the instances are generated from the instances of the domain classes and relationships de ning the
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2 Desmond F D Souza and Alan Cameron Wills, Objects, Components, and Frameworks with UML: The Catalysis Approach, Addison-Wesley, 1998
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