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Shlaer mellor-method

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  • 1. The Shlaer-Mellor Method -Sumant Kulkarni
  • 2. Shlaer-Mellor Method An approach to develop industrial grade s/w. Software system is initially split up into domains. Domains broken down into subsystems to be analyzed in depth. Comprehensive coverage for the analysis, design and implementation.
  • 3. Shlaer-Mellor MethodEach Domain is: Independent of the each other. Has a subject matter. Divided into multiple subsystems to provide coherent and manageable work.
  • 4. Shlaer-Mellor Method Partition the system into domains  Application Domain  Service Domain  Architecture Domain  Implementation DomainUse of Domain Chart to depict these domains and their relationship.
  • 5. Shlaer-Mellor MethodGeneral process of applying the S-M method: Partition the system into domains Analyze application domain Verify the analysis using static and dynamic verification. Extract the requirements for the service domains. Analyze the service domains. Specify the components of the architectural domain. Build the architecture components. Translate the models of each domain using the architectural components.
  • 6. Shlaer-Mellor Method Domains are organized in client-server like architecture. Domain Bridges. Domain Chart is also supported by fair textual description for each domain and each bridge.
  • 7. Shlaer-Mellor MethodDomain Chart:
  • 8. Shlaer-Mellor Method When domain is too large, it is partitioned into a set of subsystems. Each subsystem must be small enough to analyze as a whole by a small team of analysts. The subsystems can be represented using: – Subsystem Relationship Model – Subsystem Communication Model, and – Subsystem Access Model These models show data relationship, event communication and data access between subsystems.
  • 9. Shlaer-Mellor MethodAnalyze the Application Domain We build application domain using: – Object information Model – State Models – Process Models (Action Specification Model) • Action Data Flow Diagram. They are separate but integrated parts of Shlaer- Mellor OOA.
  • 10. Structure of the primary models of S-M Object- Oriented Analysis
  • 11. Shlaer-Mellor MethodObject Information Model Based on Relational Model (E-R) of data Some behavioral features are also seen.
  • 12. Shlaer-Mellor Method State Models are: – Deterministic Finite State Machines – Usually Moore representation is used. Action Specification shows sequence and conditionality.
  • 13. Shlaer-Mellor Method The Models can be mathematically transformed into other forms. ---- How???? State Models can be joined, split and repackaged. ---How??? While analyzing application domain, we do not worry about design details. Analysis requires analysts to know only: – What data is required – When something is to be done, and – What exactly needs to be done
  • 14. Shlaer-Mellor MethodBuilding OOA models in order: – Object Information Model – Objects – State Model – Behavior – Process Model – Processing• Very little iteration is required to settle on the three models for an experienced person. -- Why?
  • 15. Shlaer-Mellor Method There are also a set of derived models to support the three models. They are:
  • 16. Shlaer-Mellor MethodValidation of the Analysis The three models together define the data, behavior and processing required in the domain. To pass static verification, a set of 72 rules should be complied by these models!!!! Formalism for the models is well defined and the models can be executed (Not clear yet). – Data is processed as OIM. – Sequence in which processing takes place – State Model – The processing is specified by Action Specifier.
  • 17. Shlaer-Mellor Method For dynamic verification can be done as below: – Establish the desired initial state of the system in data values in object Information Model. – Initiate the desired behavior by sending an event to State Model. – Execute the processing as specified by the Action Specification and as sequenced by State Model. – Evaluate the outcome against expected.
  • 18. Shlaer-Mellor Method Requirements Generated by Application Domain
  • 19. Shlaer-Mellor Method Requirements for Service Domain – Abstracted issues of Application – Needs of Application Analyze Service Domain – Application is the client and Service is server. – Sufficiently analyze application domain first. Architecture domain – Design related. – Application Independent but Efficient for the Application.
  • 20. References Peter Biggs. A Survey of Object-Oriented Methods http://www.smartdraw.com/resources/tutorials/shlaer-mellor-diagrams/#/resources/tutorials/Cla http://ooatool.blogspot.com/ Sally Shlaer and Stephen J. Mellor. The Shlaer-Mellor Method. 1996 Rodney C. Montrose. Object-Oriented Development Using the Shlaer-Mellor Method. 1995 Neil Lang. Shlaer-Mellor Object-Oriented Analysis Rules. 1993 http://www.smartdraw.com/resources/tutorials/shlaer-mellor-diagrams/ http://homepages.feis.herts.ac.uk/~comqmw/SDD/OO/shlaer-mellor/SH-MELL.html R.J. Wieringa and G. Saake. Formal Analysis of the Shlaer-Mellor Method: Towards a Toolkit of Formal and Informal Requirements Specification Techniques, 1996
  • 21. Shlaer-Mellor Method SHLAER, S. AND MELLOR, S. 1988. Object Oriented Systems Analysis: Modeling the World in Data. SHLAER, S. AND MELLOR, S. 1989. An object-oriented approach to domain analysis. SHLAER, S. AND MELLOR, S. 1992. Object Lifecycles: Modeling the World in States