Applying Object Composition to Build Rich Domain Models
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Modern business applications rely heavily on rich domain classes, which in turn rely heavily on polymorphic execution, code reuse and similar concepts. How can we extend rich domain classes to support complex requirements? In this presentation, Zoran Horvat will show why an object composition approach is favored over class inheritance when it comes to code reuse and polymorphism. The presentation covers: How class inheritance can lead to combinatorial explosion of classes What the limitations of object composition are What design patterns help consume composed objects Techniques for creating rich features on composed objects Watch the webinar recording here: http://www.postsharp.net/blog/post/webinar-recording-object-composition
Applying Object Composition to Build Rich Domain Models
- 1. Applying Object Composition to Build Rich Domain Models Zoran Horvat CEO & Principal Consultant, Coding Helmet Consultancy zh@sysexpand.com http://codinghelmet.com zoranh75
- 3. Watch the webinar recording here: https://www.postsharp.net/blog/we binar-recording-object-composition
- 14. Animal obj = ...
- 15. Animal obj = ... if (obj is Mammal) { }
- 16. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger }
- 17. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength }
- 18. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can }
- 19. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can }
- 22. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can }
- 23. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can } else if (obj is WaterMammal) { WaterMammal mammal = (WaterMammal)obj; // e.g. a whale // Pull mammals fins using all your strength // Swim as fast as you can }
- 24. Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can } else if (obj is WaterMammal) { WaterMammal mammal = (WaterMammal)obj; // e.g. a whale // Pull mammals fins using all your strength // Swim as fast as you can }
- 25. Logic duplication, but no true code duplication! Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can } else if (obj is WaterMammal) { WaterMammal mammal = (WaterMammal)obj; // e.g. a whale // Pull mammals fins using all your strength // Swim as fast as you can } .
- 26. Logic duplication, but no true code duplication! Animal obj = ... if (obj is Mammal) { Mammal mammal = (Mammal)obj; // e.g. a tiger // Pull mammals tail using all your strength // Run as fast as you can } else if (obj is WaterMammal) { WaterMammal mammal = (WaterMammal)obj; // e.g. a whale // Pull mammals fins using all your strength // Swim as fast as you can } .
- 38. Watch the webinar recording here: https://www.postsharp.net/blog/we binar-recording-object-composition
- 48. Watch the webinar recording here: https://www.postsharp.net/blog/we binar-recording-object-composition
- 49. Animal Classification Environment Abilities
- 50. Animal Classification Environment Abilities Mammal Ground Walk, Run
- 51. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run
- 52. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run
- 53. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk
- 54. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk Gastropod Ground Walk (?)
- 55. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk Gastropod Ground Walk (?) Mammal SaltWater Surface, Dive, Underwater Mammal SaltWater Surface, Dive, Underwater
- 56. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk Gastropod Ground Walk (?) Mammal SaltWater Surface, Dive, Underwater Mammal SaltWater Surface, Dive, Underwater BonyFish SaltWater Underwater, Glide BonyFish FreshWater Underwater
- 57. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk Gastropod Ground Walk (?) Mammal SaltWater Surface, Dive, Underwater Mammal SaltWater Surface, Dive, Underwater BonyFish SaltWater Underwater, Glide BonyFish FreshWater Underwater Bird Air, Ground Fly, Walk Bird Air, Ground Fly
- 58. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk Gastropod Ground Walk (?) Mammal SaltWater Surface, Dive, Underwater Mammal SaltWater Surface, Dive, Underwater BonyFish SaltWater Underwater, Glide BonyFish FreshWater Underwater Bird Air, Ground Fly, Walk Bird Air, Ground Fly Mammal Ground Walk, Run, Glide
- 59. Animal Classification Environment Abilities Mammal Ground Walk, Run Mammal Ground Walk, Run Bird Ground Walk, Run Bird Ground Walk, Run Reptile Ground Walk Gastropod Ground Walk (?) Mammal SaltWater Surface, Dive, Underwater Mammal SaltWater Surface, Dive, Underwater BonyFish SaltWater Underwater, Glide BonyFish FreshWater Underwater Bird Air, Ground Fly, Walk Bird Air, Ground Fly Mammal Ground Walk, Run, Glide Mammal Air, Ground Fly
- 68. Double dispatch ability.Accept(visitor); void Run.Accept(AbilityVisitor visitor) { visitor.Accept(this); // Accept(Run) }
- 69. Watch the webinar recording here: https://www.postsharp.net/blog/we binar-recording-object-composition
- 70. Questions? Zoran Horvat CEO & Principal Consultant, Coding Helmet Consultancy zh@sysexpand.com http://codinghelmet.com zoranh75