Visual Formal Methods R J Walters. Introduction Motivation The Language The tools An example...
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Transcript of Visual Formal Methods R J Walters. Introduction Motivation The Language The tools An example...
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
RDT: Processes
Process has state Displayed as a picture Built using system of dialogue boxes 3 types of event
– Receive– Send– Create
RDT: Models
Add instances of processes to your model
Describe how these instances are (initially) connected
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
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
Executing the model
Each Channel (instance) has a window which shows:– Name– List of values held in the channel
RDT: Conclusion
Language, model construction tool, execution tool, translation tool
Builds formal models using “informal” methods