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Visual Formal Methods

Visual Formal Methods. R J Walters. Introduction. Motivation The Language The tools An example Conclusion. Issues in large systems. Connecting the parts Getting the result to make sense. RDT. Draw your processes (components) Draw how they are connected

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Visual Formal Methods

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  1. Visual Formal Methods R J Walters

  2. Introduction • Motivation • The Language • The tools • An example • Conclusion

  3. Issues in large systems • Connecting the parts • Getting the result to make sense

  4. RDT • Draw your processes (components) • Draw how they are connected • Run the model in the execution tool • Use a model checker on it - SPIN • * Limitations are accepted in exchange for ease of use

  5. RDT: Processes • Process has state • Displayed as a picture • Built using system of dialogue boxes • 3 types of event • Receive • Send • Create

  6. RDT: Events, Receive

  7. RDT: Events, Send

  8. RDT: Events, Create

  9. An example process

  10. An example process

  11. RDT: Models • Add instances of processes to your model • Describe how these instances are (initially) connected

  12. Models: Process Instances

  13. Models: Connections

  14. Example model

  15. Example model

  16. What next? • Execute the model • Use a model checker on it

  17. Channels: • Communication in RDT is founded on the pi-calculus • Similar identity between values and channels • RDT also permits asynchronous communication • Need channels in the execution tool

  18. Executing the model • Each Process instance has a window which shows: • Name and type • State • List of available actions • List of local channel names mapping these to instances of channels

  19. Executing the model • Each Channel (instance) has a window which shows: • Name • List of values held in the channel

  20. The Execution tool

  21. The Execution tool

  22. RDT: Conclusion • Language, model construction tool, execution tool, translation tool • Builds formal models using “informal” methods

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