Recap of Distributed State Machines Chapter 5

in Foo definitions are available without a namespace import, DistributedSystem variables, NextStep, HostNext, Network reordering, duplication allowed broadcast network properties, and more. Explore the concepts in Distributed State Machines Chapter 5 through images and explanations.

• Distributed State Machines
• Recap
• Network Model
• Polymorphic Host
• Dafny Modules

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Uploaded on Feb 23, 2025 | 0 Views

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Presentation Transcript

1. Distributed State Machines chapter 5 recap

2. Dafny Modules import opened Foo definitions in Foo are available here without a namespace import Foo definitions in Foo are available here under Foo we use this to avoid collisions across Constants, Variables, Init, Next module X refines Y this has nothing to do with chapter04 state machine refinement

3. Start with DistributedSystem DistributedSystem Variables, NextStep, HostNext Network Host Host Coordinator Participant Host Participant

4. Polymorphic Host module DistributedSystem It's just a state machine! Network Variables is just a union type We need GroupWFConstants, GroupWF, GroupInit to configure how many hosts fit together. Host Host Coordinator Participant Host Participant

5. Properties of chapter05's Network model reordering & duplication allowed broadcast network: Network unaware of src or dst (arbitrary delays allowed -- but they only affect liveness)