© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 1 XWeave Models and Aspects in Concert Iris Groher Siemens AG, CT SE 2 Markus Voelter Independent Consultant

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 2 Contents 1.Model-Driven Software Development in a Nutshell 2.Model Weaving 3.XWeave 4.Home Automation Example (Smart Home) 1.Smart Home (Meta) Models 2.Examples 5.Evaluation 6.Conclusion and Future Work

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 3 Model-Driven Software Development (MDSD) Systems are mostly described in terms of models Models play the role of source code Models do not only constitute documentation Models are processed by tools Models are instances of meta models Meta models describe the abstract syntax of models Meta models are instances of meta meta models MOF, Ecore Infrastructure Editors Model transformations Used for processing and refining models Generators

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 4 Model Weaving Model Evolution Changes are localized in aspects Simplifies traceability and change management Product Line Engineering Variable (optional) parts are captured in aspect models Woven to minimal core common to all products Architectural Viewpoints Combination of different viewpoints to form a consistent whole

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 5 XWeave Model weaver based on EMF’s Ecore meta meta model Weaving of both meta models and models Takes a base model and one or more aspect models as input Weaves content of aspect model into base model (asymmetric AO) Base model defines core abstractions Aspect model defines delta to core abstractions and pointcuts All properties of the aspect element including its child elements are woven into the base model

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 6 Pointcut Definition Name matching If a model element in the aspect model has a corresponding element in the base model the element if woven. Name and type have to be equal Expressions Defined external to both models Uses oAW expression language, based on OCL %expressionName Path expressions Working with collections Selection/filtering

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 7 Home Automation Example (Smart Home) Electrical and electronic devices (e.g. lights, blinds,...) Sensors measure physical values Controllers activate devices State can be monitored and changed from common UI

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 8 Smart Home (Meta) Models Smart Home Meta Model Smart Home Model

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 9 Examples – Model Weaving Aspect Model Resulting Model Base Model

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 10 Examples – Meta Model Weaving Aspect Model Resulting Model Base Model

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 11 Example – State Machine

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 12 Evaluation Weaving of both EMF meta models and models Pointcut definition based on name matching and expressions Limited advice No changing, removing, or overriding of base model elements Only additive weaving is supported

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 13 Conclusion and Future Work Model weaving is a possible way of integrating AOSD and MDSD XWeave simplifies Model evolution Variability on model level Combination of architectural views We are currently implementing a demonstrator of a product line that uses XWeave to implement variability on model level. Future Work Combine XWeave with a variant management tool Removing, changing, and overriding of base model elements Symmetric weaving

© Siemens AG, CT SE 2, Iris Groher, Markus Voelter C O R P O R A T E T E C H N O L O G Y XWeave – Models and Aspects in Concert 14