Failfast
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The document discusses the concept of "fail fast" in software development. It advocates for failing immediately when errors are encountered rather than failing silently, which can lead to bugs appearing unexpectedly later on. It recommends using assertions to validate conditions and ensure failures occur early in development. Debugging is identified as the most annoying part of software work, and failing fast is presented as a solution to reduce debugging time by catching errors sooner.
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Failfast
- 1. Welcome to Fail Fast Session By @AlSayedGamal 1
- 3. Agenda Fail Immediately! Assertion! Eliminate the debugger! Fail fast and robust software. 3
- 4. Q1:What’s the most annoying part of software development ? 4
- 6. Q2:What are the most hated bugs ? 6
- 7. A: Bugs that appear unexpectedly after a long time of operating normally! 7
- 8. Fail Fast is the solution 8
- 9. Fail Immediately Fail Fast concept can be digested as failing immediately and clearly. 9
- 10. Can you debug this ? Imagine this in a web based app & the developer had a typo in config file 10
- 11. What about debugging this ? Same typo will be spotted immediately. 11
- 13. Assertions What’s assertion ?! Make sure that your language fails on assertion error.! When is the most suitable time to do assertion.! Assertion doesn’t conflict with logging. 13
- 14. Design your assertions Only if your language doesn’t have a powerful one already 14
- 15. * هوين؟ بط *But when ? 15
- 16. –Jim Shore “However, it’s tough to know when to add assertions. One way to tell is to look for comments.” 16
- 17. The Killing Exception When Assert.notNull() can save your life. 17
- 18. 18
- 19. Debug this. The hair pulling phase. 19
- 20. but when ?* ؟ هوين *بط 20
- 21. Assertion not required Assertion required 21 Rule of thumb
- 23. 23 and even better If the maxConnections wasn’t found or mistyped it will throw! something like this one:
- 24. 24 Fail fast robust software Global exception handler
- 25. Summary Don’t fail silently and save your time and out time.! Assert whenever you comment.! Assert.notNull(_instanceVariable).! Fail with description.! Use a global handler for users sake. 25
- 26. References http://www.martinfowler.com/ieeeSoftware/failFast.pdf! en.wikipedia.org/wiki/Fail-fast 26
- 28. Thank you!