Sticky hands

36 slides based on https://publicobject.com/2019/06/10/value-objects-service-objects-and-glue/

Transcript

1. Sticky hands Or how to avoid sticky situations at work and home
2. Software is hard
3. Software is hard • Thinking in abstractions
4. Software is hard • Thinking in abstractions • Lots of patterns to follow
5. Software is hard • Thinking in abstractions • Lots of patterns to follow • Past personal experience is almost always a sole source of wisdom
6. Software is hard • Thinking in abstractions • Lots of patterns to follow • Past personal experience is almost always a sole source of wisdom • Naming is hard
7. Making the limbo tolerable
8. Jesse Wilson • https://publicobject.com/2019/06/10/value-objects- service-objects-and-glue/ • https://www.youtube.com/watch?v=YZstpc2939s
9. The framework
10. Value objects
11. Value objects • Immutable snapshot of data
12. Value objects • Immutable snapshot of data • Serializable
13. Value objects • Immutable snapshot of data • Serializable • Logic within available properties
14. Value objects • Immutable snapshot of data • Serializable • Logic within available properties • Not tested
15. Value objects • Immutable snapshot of data • Serializable • Logic within available properties • Not tested • A thing
16. Value objects data class User(val firstName: String, val lastName: String) { val fullName = "$firstName $lastName" } For Java: - https://github.com/google/auto/tree/master/value - https://projectlombok.org/
17. Service objects
18. Service objects • Fun and business things
19. Service objects • Fun and business things • Focused on one functionality
20. Service objects • Fun and business things • Focused on one functionality • Composable
21. Service objects • Fun and business things • Focused on one functionality • Composable • Have fake implementations
22. Service objects • Fun and business things • Focused on one functionality • Composable • Have fake implementations • Easy to test and tested thoroughly
23. Service objects • Fun and business things • Focused on one functionality • Composable • Have fake implementations • Easy to test and tested thoroughly • A doer
24. Service objects class NuclearReactor( private val fissionCreator: FissionCreator, private val heatGenerator: Heater, private val cooler: Cooler ) { fun createReaction(): NuclearReactionStatus { return try { val chainReaction = fissionCreator.startChainReaction() val warmReaction = heatGenerator.addSomeHeat(chainReaction) if (warmReaction.producedEnergy > 0) { NuclearReactionStatus.ENERGY } else { NuclearReactionStatus.NOTHING } } catch (boom: Exception) { NuclearReactionStatus.BOOM } } }
25. Glue
26. Glue • Platform entry points (think main method or spring controllers)
27. Glue • Platform entry points (think main method or spring controllers) • Platform service object types
28. Glue • Platform entry points (think main method or spring controllers) • Platform service object types • Integration tested or not tested
29. Glue • Platform entry points (think main method or spring controllers) • Platform service object types • Integration tested or not tested • SomethingSomethingPlatformSpeak
30. Sticky hands
31. Sticky hands Don’t put your hands into glue
32. Sticky hands • Run away from the glue as soon as possible, leave minimal code behind
33. Sticky hands • Run away from the glue as soon as possible, leave minimal code behind • Pull service objects out of the glue, don’t forget to wipe them
34. Sticky hands • Run away from the glue as soon as possible, leave minimal code behind • Pull service objects out of the glue, don’t forget to wipe them • Wear Interfaces to not touch the glue directly
35. Jesse Wilson • https://publicobject.com/2019/06/10/value-objects- service-objects-and-glue/ • https://www.youtube.com/watch?v=YZstpc2939s
36. Fin