2 KiB
2 KiB
Best current practices for designing systems with TLA+
(According to Claude 3.5: Sonnet - 2025-02-20)
- Start with High-Level Specifications:
- Begin by specifying the high-level properties and behaviors of the system.
- Focus on safety (nothing bad happens) and liveness (something good eventually happens) properties.
- Use Simple and Clear Definitions:
- Keep your specifications simple and clear.
- Use meaningful names for variables and operators to improve readability.
- Incremental Refinement:
- Develop your specification incrementally.
- Start with an abstract model and gradually refine it to add more details.
- Leverage TLA+ Modules:
- Use existing TLA+ modules (e.g., Integers, Sequences) to avoid reinventing the wheel.
- Extend modules to reuse common definitions and operators.
- Model Checking Early and Often:
- Use the TLC model checker to verify your specifications early in the development process.
- Regularly check for invariants and properties to catch errors early.
- Document Assumptions and Invariants:
- Clearly document the assumptions and invariants in your specifications.
- Use comments to explain the purpose and logic of complex expressions.
- Use PlusCal for Algorithmic Specifications:
- Use PlusCal for specifying algorithms in a more familiar, imperative style.
- Translate PlusCal code to TLA+ to leverage the power of TLA+ for verification.
- Test with Different Configurations:
- Test your specifications with different initial states and parameters.
- Use TLC configuration files to manage different test scenarios.
- Collaborate and Review:
- Collaborate with team members to review and improve the specifications.
- Use version control to manage changes and track the evolution of your specifications.
- Iterate Based on Feedback:
- Iterate on your specifications based on feedback from model checking and peer reviews.
- Continuously refine and improve the specifications to better capture the system's behavior.