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Automatic Synthesis of SDL models in Use Case Methodology

Automatic Synthesis of SDL models in Use Case Methodology. Dr. Nikolai N. Mansurov. Dr. Nikolai N. Mansurov Head of Dept. of CASE Tools, Institute for System Programming, Moscow. Formal description techniques: SDL, MSC, UML, ASN.1, ACT-1 Compiler Design Automatic Code Generation

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Automatic Synthesis of SDL models in Use Case Methodology

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  1. Automatic Synthesis of SDL modelsin Use Case Methodology Dr. Nikolai N. Mansurov Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  2. Dr. Nikolai N. MansurovHead of Dept. of CASE Tools, Institute for System Programming, Moscow • Formal description techniques: SDL, MSC, UML, ASN.1, ACT-1 • Compiler Design • Automatic Code Generation • Program understanding, reverse engineering Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  3. Definition of Use Case • Actor • external entity, communicates with system to achieve goal • Use Case • sequence of interactions between one or more actors and system • Scenario • sequence of events Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  4. Description of Use Cases uses user external extends operator Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  5. Description of Use Cases • Use Case diagram • relations between actors and use cases • relations between use cases • Description of scenarios • informal text • structured text/tabular • UML Sequence Diagram • Message Sequence Charts (MSC) Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  6. Overview of the Process • Analysis • Requirements Analysis • System Analysis • Design • System Design • Detailed Design • Implementation Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  7. Two Modeling Perspectives Requirements • Static Path • how entities form structures and hierarchies • Functional Path • how entities collaborate functional static Completesystem Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  8. Use Case Methodology Requirements Use Cases Actors System Scenarios Architecture System model Collaborations Detailed model Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  9. A B C Behavior and Structure P Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  10. Summary of Approach • Formalization of Use Cases using HMSC • Use Cases are mapped to FSM • Use Cases describe Data Flow • Automatic Synthesis of SDL models • complete • both static structure & behavior • typebased • non-deterministic Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  11. Summary of Approach (2) Requirements Use Cases Actors System scenarios Architecture System model Class collaborations Detailed model Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  12. Summary of Approach (3) Requirements Use Cases Actors System scenarios Architecture System model Class collaborations Detailed model Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  13. Formalization of Use Cases • Each scenario is formalized using Message Sequence Charts (MSC) • Control-flow relationships between scenarios are formalized using High-LevelMSC (HMSC) • Data-flow relationships between scenarios are formalized using our Data Extensions to MSC language Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  14. Message Sequence Charts message instance head message toenvironment msc abc a c text x b instance axis local condition local global condition global stop action instance end Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  15. High-Level MSC (HMSC) start msc habc flow line global condition loop msc reference abc cba Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  16. Control-flow relationships • Alternative (sub-) scenarios • Iterations of (sub-) scenarios • “Uses” relation between use cases • “Extends” relation between use cases Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  17. Execution of use cases • Sequential schema • use cases can not execute simultaneously • Parallel schema • different use cases can execute simultaneously • Multiple instance schema • multiple instances of the same use case can execute simultaneously Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  18. Sequential schema msc sequential start UC_1 UC_2 Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  19. start UC_2 Parallel schema msc parallel start UC_1 Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  20. Data Flow • Local data flows • actions • information passing between actors • local conditions • Data-flow relations between scenarios • variables Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  21. local Local data flow msc abc a c x (p,q) b y (p,q) a w r:=p+1 r>0 q z r Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  22. Global data flow msc abc msc cba a a x y (p,q) stack:=push(stack,p,q) stack:=pop(stack,p,q) z w (p,q) Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  23. Extensions to MSC • Actions • var := expr • func( expr_1, …, expr_n ) • message parameters • only variable names • local conditions with boolean expression as comment • var <op> {var | const } Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  24. Synthesis Algorithm NDFSM slicing DFSM synthesis parsing ordering MDFSM Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  25. msc reply msc wait s r s r x y T w DFSM R DFSM S Set(T) Out(y,r) In(x,s) In(w,r) Timeout(T) In(y,s) Out(x,s) Out(w,s) Synthesis Algorithm (2) Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  26. DFSM R Set(T) In(x,s) Timeout(T) In(y,s) Out(w,s) Synthesis Algorithm (3) process R St_0 x y Set(T) w to s St_1 T Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  27. x to s y to r DFSM S Out(y,r) In(w,r) Out(x,s) Synthesis Algorithm (4) process S any St_0 w Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

  28. Conclusions • Automatic synthesis of SDL models is suitable for rapid prototyping in MSC • Can be applied for re-engineering legacy software • Dramatically reduces learning curve for SDL Dr. Nikolai N. Mansurov, Dept. of CASE tools, ISP

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